Every time you turn off your computer, you will be prompted "Closing shellwndtray.exe program". I wonder what program it is. Who can help me?

Talking about the Fast Shutdown of Computer (Another Shutdown Method of Computer)

First, WindowsXP.

1. Make a file to close it. Create a new file on the desktop with notepad file, and enter "(New Active XObject ("shell. Application ")). Close Windows 0 (don't enter quotation marks, the same below), then close the save and rename it "shutdownsj", so that the file can be closed every time you double-click it with the mouse.

2. countdown to shutdown. Enter "Shutdown -s -t 30" in Start → Operation and confirm. It can be shut down after 30 seconds, where 30 is the countdown to shutdown. You can also customize the input. If you want to cancel the countdown shutdown, you can enter "shutdown -a".

3. Turn it off regularly. Create a new "shortcut" on the desktop, and enter (the default installation disk is disk C) in the wizard "Location": c: \ Windows \ System32 \ tsshutdn.exe1powerdown/delay: 01,where 10 is the delay time of shutdown. In fact, at this time, the planned shutdown of the mine needs to add this "shortcut" with the "plan task" program, and then set it as the shutdown time of XX, such as 22:00 at night.

You can also directly enter "at xx: xx shutdown-s" from startup to operation (xx: xx refers to downtime).

4. Make shutdown settings. In windowsXP, you can set the shutdown. Enter "Shutdown-i" from start to run, and the Shutdown Settings window will pop up, where you can set "Remote Shutdown", early warning time settings, planning options, etc. It depends on your settings. If you want to get more shutdown skills, you can use "shutdown-help" to query.

Note: If you want to shut down in windows2000, just copy the "shutdown.exe" file in the directory of windowsXP c:\windows\system32 to the directory of Windows2000 c:\winnt\system32.

Second, windws98.

Modifying the registry in windows98 can realize fast shutdown.

1. Enter regedit in Start → Run to open the Registry Editor.

2. Expand it into HKEY _ class _ root \ directory \ shell branch.

3. Create a new primary key named Close and change the key value of "default" under this primary key to "Quick Shutdown".

4. Then create a new primary key named Command under the Close primary key, and change the key value of "default" under this primary key to Rundll32.exe user.exe, and exit Windows. Then save and exit Registry Editor.

5. Restart the system. Click the "Start" menu with the right mouse button, and you can select the "Quick Shutdown" item in the pop-up right-click menu to shut down the computer.

Harm of fast shutdown

There is a fast shutdown method circulating on the Internet: call up the task manager, hold down the Ctrl key, click Shutdown, and it can be shut down in three seconds, which is very fast. In addition, there are some fast shutdown softwares, such as SuperFast Shutdown, which can also be used for fast shutdown.

As we all know, when the system is shut down, there are a series of operations, including closing windows, ending processes and services, saving data and so on. Also, does it save some steps to shut down as quickly as above, and will it cause harm to the system?

Let's take a look at the steps to go through when the system shuts down normally:

(1) shutdown instructions are notified to CSRSS.EXE and CSRSS.EXE, Windows subsystem. After receiving the notice, they will exchange data with Winlogon.EXE, and then Winlogon.EXE will inform CSRSS.EXE to start the system shutdown procedure.

(2)CSRSS.EXE queries user processes with the top-level window in turn, and lets these user processes exit.

(3) Then start to terminate the system process.

The above three steps are the most time-consuming part of the whole Windows shutdown process, and most of the reasons for the slow shutdown are caused by these three steps.

(4)Winlogon.EXE calls the function NtShutdownSystem () to command the system to perform the following finishing work and finally close it.

It seems that the Windows shutdown process is quite complicated. However, using the Ctrl key to shut down or using some quick shutdown software does not go through the complete four-step process, and often skips the first three steps and directly calls the NtShutdownSystem () function to shut down.

Many software will write data into memory when it is running, and then save it to a file when it exits. If you shut down the computer without going through the previous steps, the program will not quit normally and the data will be lost, which may lead to some unexpected errors due to the loss of important data, which is harmful to the system.

Therefore, I suggest that you try not to use the Ctrl key to shut down or some fast shutdown software. After all, data security is much more important than saving shutdown time.

Today, all kinds of viruses are blooming, which makes people panic. Once I found that my computer was a little abnormal, I thought it was a virus. You look everywhere for anti-virus software. One can't work, you can have another one. In short, it seems that we will not stop until we find the "culprit". As a result, virus software has been used. Perhaps because of this, the renminbi has been used one after another, but there is still no sign of the "culprit". In fact, this is not necessarily a virus. Such examples are not uncommon, especially for some junior computer users. Next, I will introduce how to judge whether I am infected with the virus from the following aspects, combining the anti-virus experience of personal computer use and enterprise network maintenance, hoping to help identify the "real virus"!

Differences and relations between viruses and software and hardware failures

Computer failure is not only caused by virus infection. All kinds of faults in the use of personal computers are mostly caused by the hardware and software faults of the computer itself, and most of them on the network are caused by the permission setting. Only by fully understanding the difference and connection between the two can we make a correct judgment and find the real virus in time.

Crash phenomenon: the virus opened many files or occupied a lot of memory; Unstable operation (such as poor memory quality and poor hardware overclocking performance); Running large-capacity software takes up a lot of memory and disk space; Some test software is used (there are many Bug)；); ); Insufficient hard disk space and so on. ; When running software on the network, it often crashes, which may be because the network speed is too slow, the running program is too large, or the hardware configuration of your workstation is too low.

The system can't start: the virus modified the boot information of the hard disk or deleted some boot files. For example, the boot file of the boot virus is damaged; The hard disk is damaged or the parameters are set incorrectly; System files were deleted by mistake, etc.

The file cannot be opened: the virus has modified the file format; The virus modified the file link location. File corruption or hard disk corruption; The link location corresponding to the file shortcut has changed; The original software used to edit the file has been deleted; If it is in a local area network, the file storage location in the server has changed, and the workstation has not refreshed the contents of the server in time (the resource manager has been open for a long time).

It is often reported that there is not enough memory: viruses illegally occupy a lot of memory; Open a lot of software; Run software that requires a lot of memory resources; The system configuration is incorrect; The memory capacity is too small (the current basic memory requirement is 128MB).

Prompt that the hard disk space is not enough: the virus copies a large number of virus files (this phenomenon is relatively common, sometimes a good hard disk of Windows 40GB operating system or Windows XP operating system says that there is not enough space, and when installing software, it prompts that the hard disk space is not enough). The capacity of each partition of the hard disk is too small; Installed a large number of large-capacity software; All software is installed in a partition; The hard disk itself is small; If the system administrator sets the space limit of the workstation user's "private disk" for each user in the LAN, then the capacity on the "private disk" is actually used up, because the size of the entire network disk is checked.

When the floppy disk and other devices are not accessed, the read-write signal is given: virus infection, and the floppy disk has taken away the files that are still open in the floppy disk.

A large number of files of unknown origin appear: virus copy files; It may be a temporary file generated during the installation of a software; It may also be the configuration information and running records of some software.

Data loss: the virus deleted the file; Hard disk sector is damaged; Overwrite the original file due to file recovery; If it is a file on the network, it may be deleted by other users by mistake.

Does formatting hard disk (not low) affect hard disk life?

A: Ordinary formatted hard disks will not affect the life of hard disks. Formatting is divided into advanced format and low-level formatting. Advanced format just clears the data on the hard disk, generates boot information, initializes the FAT table, and marks logical bad tracks. The low-level format is to divide the hard disk into cylinders and tracks, and then divide the tracks into several sectors, and each sector is divided into identification ID, interval area, gap and data area. Low-level formatting is advanced format's previous work, and every hard disk is low-level formatting before leaving the factory. Low-level formatting is a destructive operation, which has a certain negative impact on the life of hard disk. The formats we usually use under Windows (including those used under DOS) are actually advanced formats.

For newly purchased hard disks in recent years, formatting operations including high and low grids will not affect their service life.

Compared with before, the physical structure of the hard disk has undergone some changes, which directly affect the changes in the execution of the corresponding hard disk instructions, the most important of which is the changes in the format instructions caused by the changes in the hard disk seek mode. At present, users can access the converted logical sector instead of the actual physical sector corresponding to the physical header. In this way, users can't actually operate the physical hard disk. At present, the so-called low-level formatting only realizes reset and redirection of bad sectors, but it can't realize hard disk regeneration and has no physical repair function.

For the commonly used advanced formats, "quick format" only resets the hard disk partition table, even if it is "full format", it only resets all sectors to zero in addition to resetting the hard disk partition table. It can be seen that there is no essential difference between formatting instructions run by users and other ordinary reading and writing operations. In the whole life cycle of hard disk, the number of reading and writing can only be measured by astronomical figures, and the number of formatting or Ghost operations can be completely ignored. According to the existing hard disk manufacturing technology, it is very rare to damage the hard disk simply because of reading and writing. Hard disk failures are mostly related to external physical collision, sudden power failure during reading and writing, and circuit damage. So the only thing to consider in formatting is to avoid the above situation.

Format parsing

◇ AVI

Since the Windows 3 era. X, AVI has become the mainstream video format, and its position is just like WAV in audio format. In AVI files, video information and sound information are stored separately, so the video in one AVI file can be combined with the sound in another AVI file. AVI file structure not only solves the synchronization problem of audio and video, but also has the characteristics of universality and openness. It can work in any Windows environment, and many softwares can edit AVI videos directly.

Although AVI has the characteristics of good compatibility, convenient calling and excellent image quality, its disadvantage is also obvious, that is, the AVI file is too large. In addition, AVI has a capacity limit of 2GB or 4GB (FAT32 file system).

◇MPEG-ⅰ(VCD)

MPEG- 1 should be the most popular video format, and VCD also adopts this coding method. The resolution of PAL MPEG-I is 352×240, which is slightly better than VHS. Moreover, a 650MB CD can store MPEG-I files for about 74 minutes, so it has been widely used.

But from today, MPEG- 1 is not satisfactory in both image quality and file size, and it is an inevitable trend to be gradually replaced by other advanced coding formats.

◇MPEG-ⅱ(DVD)

MPEG-II greatly improves the picture quality on the basis of MPEG-I, and the resolution of PAL standard MPEG-II is as high as 720×576. In addition, MPEG-II adopts inter-frame compression and intra-frame compression when encoding, and improves the image quality through motion compensation and other technologies.

As far as clarity is concerned, MPEG-II is almost impeccable, but it is not perfect. Because MPEG-II has not made a breakthrough in compression technology, its data volume is larger than MPEG-I, so it is difficult to be used for personal production before the popularity of DVD recorders. In addition, the compressed data stream of MPEG-II is special, and all kinds of editing software can't access it at will, so the material search will be very slow in nonlinear editing. More importantly, the huge MPEG-II codec must rely on powerful processing chips.

◇ MPEG4(DivX、XviD、WMV9)

MPEG4 is the most popular video format at present, and it is called DVD killer. MPEG4-4 has fine picture quality, dynamic and realistic sound effect, and the audio-visual effect is close to DVD level. Moreover, under the condition of ensuring the same image quality, the file size of MPEG4-4 encoding can reach about 1/3 of the original DVD video file. More importantly, the encoding rate of MPEG4-4 can be set freely, allowing users to easily choose between image quality and volume.

At present, the common MPEG-4 coding technologies can be divided into DivX, XviD and Microsoft MPEG-4v3. Microsoft MPEG4 V3 coding is mainly used for ASF files, which basically poses no threat to DVD. Surprisingly, Microsoft modified MPEG4 and introduced WMV, which has gradually become a climate. With the launch of Windows Media Encoder9, WMV9 will provide DVD-like quality, and make efforts in copyright protection.

DivX and XviD point their finger at DVD, both of which have the functions of dynamic compensation, visual and psychological intelligence compression, and can also cooperate with the subtitle function to achieve the same effect as DVD movies. In video capture, DivX and XviD coding do not require high system performance, and the reduction of data volume can obviously reduce the burden on CPU and disk system. At present, DivX and XviD codecs are free, so they are very popular.

Real media

RealMedia should be said to be one of the most popular online streaming media formats, and it is its birth that makes online video widely used. Amazingly, RM can still achieve uninterrupted video playback when using a 56K modem to dial up the Internet. In addition, similar to MPEG4-4, RM can set its own encoding rate, and it also has dynamic compensation. When the coding rate is above 5 12Kbps, the image quality of RM is higher than that of VCD. However, at the same coding rate, the quality of RM is still not as good as that of MPEG4-4.

In order to change the defect that RealMedia is not suitable for high-quality video storage, Real Company introduced RMVB format. VB is VBR, which is the abbreviation of variable bit rate. Still pictures and moving pictures in movies have different requirements for compression ratio. If the bit rate is always fixed, the file capacity will be wasted, and the picture quality will be poor in large dynamic video scenes.

RMVB breaks the original RM format that keeps a fixed compression ratio from beginning to end, introduces a dynamic compression ratio, and uses a higher bit rate for complex dynamic pictures (such as singing and dancing, flying cars, wars, etc.). ), but flexibly switch to a lower coding rate for static pictures, so as to make rational use of bit rate resources. In this way, the video quality can be further improved without changing the average coding rate.

◇ MOV

MOV is a video format promoted by Apple, which can be used in both MAC system and PC platform. MOV format video files can be decompressed or compressed, and their compression algorithms include Cinepak, Intel Indeo Video R3.2 and video coding. Although ordinary people have little contact with files in MOV format, MOV is still of great significance in video editing. Adobe's professional multimedia video processing software AfterEffect and Premiere both support MOV at the bottom, allowing direct editing. Objectively speaking, the once brilliant MOV is no longer brave, and it is not suitable as the final carrier of video file output.

Comparison of characteristics of common multimedia formats

MPEG-ⅰMPEG-ⅱDivX XviD WMV RM RMVB MOV AVI

The default PAL system is 352×288 720× 576 variable variable variable variable variable variable variable variable 320×240 320×240.

The default NTSC 352×288 640× 480 variable variable variable variable 320×240 320×240.

Maximum audio channel 2888828222

The default encoding rate is 1.5mbps 4 ~ 8mbps variable variable variable variable 800 ~ 1600kbps NA.

Video quality is generally good, coding settings are generally high, and coding settings are generally good.

Whether there is dynamic compensation, whether there is.

Coding hardware requirements are generally high, high, high, high, high and low.

The decoding hardware requirements are very low, generally higher, higher, higher, lower, higher and lower.

Good editability, generally poor, poor, poor, poor, poor, good, good.

Extended MPG, MPEG, M2V, DAT MPG, MPEG, VOBAVI VIWMV, ASF RM, RAMMVB MOVAVI.

Second, the image quality comparison and technical indicators

Undeniably, image quality is very important for video coding format. Under the condition of the same compression ratio, the video format with the best image quality is naturally respected by the majority of users. Therefore, we chose two coding rates for testing, namely 1.5Mbps and 5 12Kbps. From the actual performance, whose video storage format is the best? The source of the video is a high-quality DVD, encoded with HyperSnap screenshots.

◇ 1.5Mbps high-speed test

From the screenshot of image quality comparison, we have to be impressed by the performance of MPEG4 and RMVB (due to the limitation of printing effect, we can't show this difference through pictures. Note: The original text was published in PCDIY magazine). Objectively speaking, at this time, the difference between them and DVD quality is very small, which is almost indistinguishable to the naked eye. In the contest between MPEG-4 and RMVB, both of them show a very high standard, and MPEG-4 is better as a whole, but to be honest, this subtle difference is hard to detect in dynamic pictures. DivX, XVI and WMV under the MPEG4-4 branch are basically on the same horizontal line, and the performances of DivX and XVI are exactly the same. Many people think that XVI is a free version after DivX 5.0, and even has some similarities in name. As for MPEG-I (VCD), due to the encoding algorithm, its image quality naturally cannot be compared with the above technologies.

◇ 5 12Kbps low bit rate test

The low bit rate of 5 12Kbps is a test of various coding technologies. If you can't show acceptable picture quality at a low bit rate, then this technology is at least not suitable for the Internet. In this test, the quality of DivX and XviD is slightly lower than that of VCD, but RM and WMV make us sit up and take notice, and they can provide similar quality to or even better than VCD. We are not surprised by this, because the original intention of DivX and XviD is to break the monopoly of DVD video in the field of high image quality, while WMV and RM are branded as streaming media, and there are more compensation technologies at low bit rate, which improves the image quality.

Third, real-time coding test.

The coding software used in the test includes RM(Helix ProducerPlus), Divx (ULAD Video Studio 6+Divx 5.05), WMV(WindowsMediaEncoder9), MPEG-I (ULAD Video Studio 6) and MPEG-II (ULAD Video Studio 6), and the operating system is Windows2000 Chinese version +SP3.

Low end configuration test

The main accessories of this low-end configuration are Celeron 550 MHz (overclocked at 366 MHz) +440BX+256MB PC 100 SDRAM. Users who use PII and low-frequency PIII, Celeron and Duron can refer to it.

For the low-end configuration, we use TV cards to record programs. The TV card processing chip used for testing is BT878, which does not have real-time coding ability, so it is fair to all coding technologies. In addition, considering the quality of the video source, except MPEG-I/II, all the others adopt the coding rate of 5 12Kbps, and the default values of various parameters are selected.

Low-end configuration real-time coding test

1 min frame dropping fluency

RM can't see what is acceptable.

DivX 355 reluctantly accepted

WMV9 can't see the difference

MPEG-Ⅰ 345 reluctantly accepted.

It is totally unacceptable for MPEG-II to stop testing.

From the test situation, RM seems to be more suitable for users with low configuration, and the excessive data volume of MPEG-II has far exceeded the processing capacity of this configuration. Unfortunately, the most practical DivX and WMV9 are not enough on low-profile machines.

◇ Mid-range configuration test

The mid-range configuration is duron1.1GHz+kt133a, and other accessories are the same as the low-end configuration. This should be regarded as a typical low-end configuration. The SSE instruction set supported by the new Duron has been optimized by various video software. The coding rate of this test is 1Mbps.

Real-time coding test of medium configuration

1 min frame dropping fluency

RM can't see that it is completely acceptable.

DivX 152 is completely acceptable.

WMV9 doesn't see it as acceptable.

MPEG-Ⅰ 0 is completely acceptable.

MPEG-Ⅱ 235 is acceptable.

When the main frequency of CPU crosses the step of 1GHz, the whole system can basically cope with various video coding technologies. Undoubtedly, for most of today's Pentium4 and AthlonXP compatible computers, it is easy to deal with all kinds of video coding, so it is foreseeable that software coding technology will eventually replace hardware coding chips, especially in the home field.

Responder: Neil _ 3000- Great Magician Level 9 4-3 09:33

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Commentator: xszf 90 1723- trainee magician level 2

Worth a look

Commentator: sy 8849- Magic Apprentice 1 Grade

I've learned a lot ~ ~ However, so many formats are a trouble after all. I feel it's best to use a universal one, alas.

Commentator: city boy _ qhl- Tong Sheng level

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Other answers *** 2

picture format

The following is from:; 3203 14

Picture format: raster picture

BMP:Windows bitmap

Windows bitmaps can store a single raster image of any color depth (from black and white to 24-bit color). Windows bitmap file format is compatible with other Microsoft Windows programs. It does not support file compression, nor does it apply to web pages.

Generally speaking, the disadvantages of Windows bitmap file format outweigh the advantages. To ensure the quality of photo images, please use PNG files, JPEG files or TIFF files. BMP file is suitable for wallpaper in Windows.

Advantages:? BMP supports 1 bit to 24-bit color depth.

BMP format is widely compatible with existing Windows programs (especially older programs).

Disadvantages:? BMP does not support compression, which will make the file very large.

The Web browser does not support BMP files.

Pcx: computer brush

PC brush pictures (also known as Z-Soft bitmaps) store a single raster image at any color depth. Brush drawing is more widely used in early Windows programs and programs based on MS-DOS. Brush drawing is compatible with many newer programs. PCX pictures support RLE internal compression.

Advantages:? PCX is a standard format between many Windows-based programs and MS-DOS-based programs.

PCX supports internal compression.

Disadvantages:? Web browser does not support PCX.

PNG: portable network graphics

PNG pictures store a single raster image at any color depth. PNG is a platform-independent format.

Advantages:? PNG supports advanced lossless compression.

PNG supports alpha channel transparency.

PNG supports gamma correction.

PNG supports interleaving.

The latest web browsers support PNG.

Disadvantages:? Older browsers and programs may not support PNG files.

As an Internet file format, PNG provides less compression than JPEG lossy compression.

As an Internet file format, PNG does not support multi-image files or animation files. GIF format supports multi-image files and animation files.

JPEG: Joint Photographic Experts Group

JPEG pictures store a single raster image in 24-bit color. JPEG is a platform-independent format that supports the highest level of compression. However, this compression is lossy. Progressive JPEG files support interleaving.

You can increase or decrease the compression level of JPEG files. However, the file size is at the expense of image quality. The compression ratio can be as high as 100: 1. (JPEG format can easily compress files at the ratio of 10: 1 to 20: 1, and the image quality will not decrease. ) JPEG compression can handle realistic photographic works well. However, JPEG compression can not provide ideal results for simple works with few colors, strong contrast, solid color borders or large solid color areas. Sometimes the compression ratio is as low as 5: 1, which seriously loses the integrity of the picture. The reason for this loss is that JPEG compression scheme can compress similar tones well, but JPEG compression scheme can not deal with strong differences in brightness or solid color areas well.

Advantages:? Photographic works or realistic works support advanced compression.

The file size can be controlled by variable compression ratio.

Support interleaving (for progressive JPEG files).

JPEG widely supports Internet standards.

Disadvantages:? Lossy compression will reduce the quality of the original image data.

When you edit and resave a JPEG file, JPEG will mix the quality of the original picture data. This decline is cumulative.

JPEG is not suitable for simple pictures with few colors, similar colors in a large area or obvious brightness difference.

GIF: graphic interchange format

GIF pictures store single raster image data or multiple raster image data in 8-bit colors or 256 colors. GIF pictures support transparent, compressed, interlaced and multi-image pictures (animated GIF).

GIF transparency is not alpha channel transparency, so it cannot support translucent effect. GIF compression is LZW compression, and the compression ratio is about 3: 1. GIF89a version of GIF file specification supports dynamic GIF.

Advantages:? GIF widely supports Internet standards.

Support lossless compression and transparency.

Animation GIF is very popular, and it is easy to make with many GIF animation programs.

Disadvantages:? GIF only supports a 256-color palette, so detailed pictures and realistic photographic images will lose color information, but they look tonal.

In most cases, lossless compression is not as good as JPEG format or PNG format.

GIF supports limited transparency and has no translucent effect or fading effect (such as the effect provided by alpha channel transparency).

TIFF: tag image file format

TIFF stores a single raster image at any color depth. TIFF can be considered as the most widely supported graphic file format in the printing industry. TIFF supports optional compression and is not suitable for viewing in a Web browser.

TIFF format is an extensible format. This means that programmers can modify the original specification to add functionality or meet specific requirements. Modifying the specification may lead to incompatibility between different types of TIFF pictures.

Advantages:? TIFF is a widely supported format, especially between Macintosh computers and Windows-based computers.

Support optional compression.

Extensible format supports many optional functions.

Disadvantages:? The Web browser does not support TIFF.

Extensibility will lead to many different types of TIFF pictures. Not all TIFF files are compatible with all programs that support the basic TIFF standard.

Picture format: vector picture

DXF:AutoCAD graphic interchange file

DXF is a vector-based ASCII format used by Autodesk AutoCAD programs. AutoCAD can provide very detailed and fully extensible charts.

Advantages:? You can use AutoCAD to create very detailed and accurate charts and graphs.

AutoCAD files are very popular in architecture, design and sculpture industries.

Disadvantages:? The support of AutoCAD in Office is limited, and Office supports AutoCAD versions before R 12.

The learning curve of AutoCAD is steep. Please note that other graphics programs can also export DXF pictures.

Computer graphics metafile

CGM metafile can contain vector information and bitmap information. It is an international standardized file format used by many organizations and government agencies, including British Standards Institute (BSI), American National Standards Institute (ANSI) and US Department of Defense.

Advantages:? CGM is an international standard format.

CDR:CorelDRAW！

CorelDRAW！ Metafiles can contain vector information and bitmap information.

Advantages:? CDR is widely used in prepress industry and art design industry.

Disadvantages:? CDR has limited support in Office, and Office supports CorelDRAW! Version 6 and earlier.

WMF: window metafile

Windows metafile is a 16-bit Tu Tu metafile format, which can contain vector information and bitmap information. It is optimized for the Windows operating system.

Advantages:? WMF is a Windows standard format, which can be well used in office.

EPS: encapsulated PostScript

"Encapsulated PostScript" format is a special printer description language, which can describe vector information and bitmap information.

Advantages:? EPS can accurately render the effect on any PostScript printer.

EPS is an industry standard format.

Disadvantages:? The screen display may be inconsistent with the output display. The screen display may be low resolution, may be a different image, or just a placeholder image.

EPS file is used for output. They are not the most suitable formats for displaying information on the screen.

EMF: enhanced metafile

Enhanced metafile is a 32-bit format, which can contain vector information and bitmap information. This format is an improvement on the "Windows Metafile Format" and contains some extended functions, such as the following:

Built-in zoom information

Built-in instructions saved with the file

Improvements in color palette and device independence

The EMF format is extensible, which means that programmers can modify the original specification to add functions or meet specific requirements. This modification may lead to incompatibility between different types of EMF pictures.

Advantages:? Extensible file format

Compared with WMF, improved functions

Disadvantages:? can