What is bitmap format?

Question 1: What BMP files are the main bitmap file formats? Generally speaking:

BMP image file format

BMP is an image file format independent of hardware devices, which is widely used. It uses bitmap storage format and does not use any other compression except image depth, so the BblP file takes up a lot of space. The image depth of BMP wear can be selected as lbit, 4bit, 8bit and 24bit. When data is stored in a BMP file, images are scanned from left to right and from bottom to top.

Because BMP file format is the standard for exchanging data related to drawings in Windows environment, all graphics and image software running in Windows environment supports BMP image format.

A typical BMP image file consists of three parts: a bitmap file header data structure, which contains information such as the type and display content of the BMP image file; Bitmap information data structure, including BMP image width, height, compression mode, defined color and other information.

Question 2: What are the image formats and what are the common image file formats?

I. BMP format

BMP is the abbreviation of English Bitmap, which is the standard image file format in Windows operating system and can be supported by many Windows applications. With the popularity of Windows operating system and the development of rich Windows applications, BMP bitmap format is naturally widely used. This format is characterized by rich image information and almost no compression, but this leads to its inherent defect-occupying too much disk space. So BMP is popular on stand-alone computers at present.

Second, the GIF format

GIF is the abbreviation of English graphic interchange format. As the name implies, this format is used to exchange pictures. Actually, it's the same. In 1980s, puServe, a famous online information service organization in the United States, developed this GIF image format for the limitation of network transmission bandwidth at that time.

GIF format is characterized by high compression ratio and less disk space, so this image format has been widely used soon. At first, GIF was only used to store a single still image (called GIF87a). Later, with the development of technology, several still images can be stored at the same time to form a continuous animation, which became one of the few formats that supported 2D animation at that time (called GIF89a). In GIF89a, you can specify a transparent area to make the image have an extraordinary display effect and make GIF more beautiful. At present, a large number of color animation files used on the internet are mostly files in this format, also known as GIF89a format files.

In addition, considering the actual situation in network transmission, the GIF image format also adds a gradual display mode, that is, in the process of image transmission, users can first see the general outline of the image, and then gradually see the details of the image as the transmission process continues, thus adapting to the user's viewing psychology from hazy to clear. At present, a large number of color animation files used on the Internet are mostly files in this format.

However, GIF has a small disadvantage, that is, it can't store pictures with more than 256 colors. Nevertheless, this format is still widely used on the Internet, which is inseparable from the advantages of short GIF image files, fast download speed and animation composed of many image files of the same size.

Third, JPEG format.

JPEG is also a common image format, which was developed by the Joint Photographic Expert Group and named ISO/KOOC-0/09/KOOC-0/8-/KOOC-0/. JPEG is just a common name. The extension of JPEG files is. Jpg or. Jpeg, its compression technology is very advanced. It uses lossy compression to remove redundant image and color data, and can display very rich and vivid images at the same time, in other words, it can get better image quality with the least disk space.

At the same time, JPEG is a very flexible format, which has the function of adjusting the image quality, allowing you to compress this file with different compression ratios. For example, we can compress the BMP bitmap file of 1.37MB to 20.3KB at most. Of course, we can find a balance between image quality and file size.

JPEG is widely used because of its excellent quality and performance, especially on the Internet and CD-ROM. At present, all kinds of browsers support JPEG as an image format. Because of its small file size and fast download speed, the web page can provide a large number of beautiful images in a short download time, and JPEG has naturally become the most popular image format on the network.

Fourthly, JPEG2000 format.

JPEG 2000 is also formulated by JPEG organization, and its official name is ISO 15444. Compared with JPEG, JPEG 2000 has higher compression rate and is a new generation of still image compression technology with more new functions.

As an upgraded version of JPEG, JPEG2000 has a higher compression ratio than JPEG ... >; & gt

Question 3: What is the general format of pictures? jpg.jpeg.gif.bmp。

Question 4: What are the common image formats? 1.BMP image file format.

Second, the PCX image file format

Three. TIFF image file format

Four. GIF file format

Verb (abbreviation of verb) JPEG file format

Sixth, TGA format

Seven. exchangeable image file

Eight, FPX image file format

Nine, SVG format

X.PSD file format

XI。 CDR file format

Twelve. PCD file format

Thirteen. DXF file format

Fourteen UFO file format

Fifteen. EPS file format

Sixteen. PNG image file format

Nine, SVG format

X.PSD file format

XI。 CDR file format

Twelve. PCD file format

Thirteen. DXF file format

Fourteen UFO file format

Fifteen. EPS file format

Sixteen. PNG image file format

Question 5: What are the formats of pictures? Common ones are jpg gif bmp jpeg jpe and then; Psdepsppng, etc. Because there are many companies that design image formats, there are n kinds of image formats.

Question 6: What are the common image file formats of bitmap format?

BMP format

GIF format

JPEG format

JPEG2000 format

TIFF format

Photoshop document

PNG format

SWF format

SVG format

PCX format

DXF format

WMF format

EMF format

LIC(FLI/FLC) format

EPS format

TGA format

Could you make your supplementary question more clear?

Question 7: How many image formats are there? The file formats commonly used for computer images are as follows:

1.BMP(*。 BMP*.RLE)

BMP(Windows Bitmap) image file was first used in MS Windows system, and it is a widely used standard bitmap image file format. It supports RGB, index, color, gray and bitmap color modes, but does not support the Alpha channel. In addition, it supports 24-bit, 8-bit, 4-bit and 1 bit formats.

2.TIFF(*。 TIF)

TIFF is the abbreviation of tag image file format, that is, tag image file format. Its appearance is not specially designed for a certain software, but for the convenience of saving and exchanging image data information between different operating platforms and applications, so it is widely used. Support RGB, CMYK, Lab, index color, bitmap mode and gray mode, and also support the Alpha channel of RGB, CMYK and gray mode. TIFF is independent of all operating systems and files, and most scanners can output image files in TIFF format.

When saving as this format in Photoshop, you will be prompted to choose the format of PC or Mac in the pop-up dialog box.

3.JPEG(*。 JPG； *.JPE)

The full English name of JPEG is Joint Photographic Experts Group. This format of images is usually used to preview images and make web pages. It has the highest compression ratio among all image formats at present. JPEG images take up half the space of compressed TIFF files, and can store better images with less disk space. The reason why JPEG images can become smaller is that some imperceptible data are lost in the process of saving, so the quality is not as good as the original image, so it is best not to save images in this format when making printed matter.

4.GIF(*。 GIF)

GIF, the image exchange format, is an image format provided by puServe, which makes communication transmission more economical. It can also use LZW compression method to compress files without taking up too much disk space. This compression format can support RGB, index color and gray color modes, and is suitable for high-contrast images, which can produce more image details than JPEG format, but its application range is limited, and it is mostly used for web page making.

5.EPS(*。 EPS)

EPS(Encapsulated PostScript) format is widely used, which can be used for drawing or typesetting. This is a PostScript format. Its biggest advantage is that it can preview in low-resolution typesetting software, edit and typeset the inserted files, and output them in high resolution when printing, giving consideration to work efficiency and image output quality.

EPS supports all color modes in Photoshop and transparency in bitmap mode, but does not support Alpha channel.

6.PSD(*。 PSD)

PSD format is a standard file format built by Photoshop. It is the only format that can save image layers, channels and other image information. When the image is saved in other formats, these layers will be merged into one layer. In addition, this format can also save information such as grids and auxiliary lines set in the image, but other formats cannot be saved. If you want to save an image in this format to another format, you need to merge the layers first.

Because images in PSD format contain a lot of image information, such as layers, channels, paths, etc., although images are compressed to reduce the occupied disk space when saved in this format, they are still much larger than image files in other formats.

7. Photo CD (*. PCD)

The photo CD format is the file format of Kodak photo CD, which supports the bitmap file format of 24-bit color and is stored in the CD in a read-only way. So this format can only be opened in Photoshop, not saved in Photoshop. When opening a file in PCD format, a prompt dialog box will appear, from which you can select an image to open. In addition, the PCD format adopts Kodak Precision Management System (KP CMS, Kodak Professional ... >); & gt

Question 8: What are the formats of pictures? BMP:Windows Bitmap Windows Bitmap can store a single raster image with 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:PC Brush PC Brush picture (also known as Z-Soft bitmap) stores a single raster image with 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 browsers do 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: JPEG images of Joint Photographic Experts Group 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 borders or pure * * * fields. 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't handle the strong difference of brightness or pure * * * domain 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: GIF pictures in graphic interchange format store single raster image data or multiple raster image data in 8-bit color or 256-color. GIF pictures support transparent, compressed, interlaced and multi-image pictures (animated GIF). GIF transparency is not ALP >>

Question 9: What are the main picture formats: JPG, BMP, PNG, TAG, GIF, PSD, TIFF, DDS, PIC, PCX, CDR, HDRI, RAW, SVG, AI, SWF, SVG and EPS? There are more things that are not commonly used, and you can customize the picture format.