What is the difference between SLR direct JPEG output and ACR direct JPEG output after shooting with RAW?

What is the difference between shooting in RAW format and exporting JPEG directly through ACR? There is a big difference between the two. This problem involves the function of ACR plug-in and its influence on the image. According to the meaning of the topic, we make a comparative analysis in three situations: (The material I use below is that I set the recording format of the camera to raw+jpg format when shooting, that is, I record a photo in jpg format and a photo in raw format by pressing the shutter once, and the same photo is more intuitive).

Our ultimate goal is to get photos in JPEG format. According to the meaning of the topic, we can get them in the following three ways:

First, the camera's photo recording format is set to JPEG format, and the finished photos are in JPEG format, which is simple and rude.

Second, as the title, the camera recording format is RAW format. We open the photos in RAW format through the ACR plug-in and export them directly to JPEG format, without doing anything.

Thirdly, after opening the RAW format photos through the ACR plug-in, post-process the photos and export them to JPEG format.

Let's take a look at the effect comparison first (the details of the picture capture part are shown in the figure):

First, direct JPEG:

Second, there is no operation, and the RAW format is converted into JPEG through the ACR plug-in:

Third, post-processing, RAW format is converted into JPEG through ACR:

As far as the effect is concerned, the third > the first > the second.

Let's analyze the reasons:

1. In the first way, the JPG picture directly generated by SLR is actually beautified in the later stage, but this processing does not need to be adjusted manually, but the camera optimizes the picture according to its own algorithm and prefabricated style. Canon camera calls it JPEG photo optimization photo style, Nikon camera calls it optimization calibration. What we see on the screen after taking pictures with a SLR camera is the optimized effect. Even if your recorded photos are not in jpg format, the camera display will show you the optimized photos, but they will not be recorded. So, if you don't know or don't want to do it in the future, choose JPEG as the photo recording format.

2. In the second way, you record photos in RAW format, and then directly convert them into JPEG format through the ACR plug-in. The effect of this transformation method is the worst, which can be said to be terrible. Why? Because the photos in RAW format record a lot of picture details, but the contrast between light and dark, color saturation or sharpness are not ideal before adjustment, the RAW format can exert its potential only after the ACR plug-in manually adjusts the relevant parameters, instead of directly converting it into JPEG format without adjustment, and only a gray picture can be obtained.

If you don't adjust the parameters artificially, but just use the ACR plug-in as a tool to convert the RAW format into JPEG format, I suggest you do the following:

Select camera calibration in the ACR menu, and we can see that the camera configuration file has a drop-down menu, which simulates some internal settings of the camera. The application settings are equivalent to the optimization effect you see on the LCD screen, much like the one-button beautification function.

Camera neutrality, camera landscape, camera portrait, adobe standards, after applying these standards, and then choose to export to JPEG format, the effect is much better.

3. The third way is the correct way to open RAW format photos. Adjust the parameters of photos through ACR plug-in, give full play to the advantages and characteristics of rich details of RAW photos, and then export them to JPEG format for publication. Of course, it is fair to spend more time adjusting and trying to take good-looking photos.

First, the number of pictures, jpeg format is 8-bit color depth. The color it interprets is the power of 2, the raw format is generally 12 bit color depth, and its color gamut is the power of 2 12. Generally speaking, the raw format can save more color details.

Secondly, jpeg is a lossless compression format, which will compress the picture to about 10, so the details of the file will be lost, but when acr is converted to tiff format, it will only be lossless compression of 1-4 times, thus retaining more details. In layman's terms: jpeg is easy to store and transmit.

Then: when the computer converts the raw format, it can carefully adjust many details such as exposure, white balance, contrast, tone and lens distortion, which can achieve good results. Jpeg format can be adjusted in a small range.

Finally: jpeg is a picture format, and raw format is not a picture format, which is also commonly known as digital negative.

When I first started filming, some seniors would ask me, do you shoot "raw"? I said I was puzzled. "What is meat? Is it meat? Exposed meat? " I said I was shy, and then I gradually came into contact with professional photography, and I was embarrassed for my previous shyness. After several years of professional system learning, what are jpeg and raw today?

What is jpg? What is raw jpg(jpeg) and raw are storage formats of digital cameras.

(comparison between raw and jpg formats)

Jpg is a popular image storage format at present. JPG is lossy storage, which reduces the storage size by removing "redundant" data (which has little effect on the display effect). The usual compression ratio is between 10: 1 and 40: 1. The data in the compression process cannot be recovered at a later stage.

RAW is an original image file format, and the information of each pixel can be preserved. When we shoot, CCD (or CMOS) will record the light quantity of each pixel with a level meter, and then the digital camera will convert these electrical signals into corresponding digital signals. Generally, the signals are recorded as 12 bits or 14 bits. In other words, raw is equivalent to a folder, which will contain all the data of your application site environment.

The advantages and disadvantages of the two methods are compared. JPG files are small, fast, occupy small space and have good compatibility. Most programs can open JPG files.

Raw file process is large, and special plug-ins are needed to open it.

(Original process)

Raw can do post-processing without losing image quality.

JPEG post-processing is at the expense of image quality, which is also the reason for the small size of jpg.

How to choose jpg/raw to combine the above advantages and disadvantages,

If the usual travel photos exist in the form of records, it is recommended to shoot jpg to save space and facilitate storage and sharing.

When shooting commercial advertisements or creating for a long time, and when it is used for exhibitions or commercial purposes, raw shooting is recommended. The lossless information is convenient for later adjustment and secondary creation.

Well, having said that, if you are still confused, you might as well pick up the camera and try shooting in different formats!

Let me first talk about the concepts of these two formats: JPG, which is a compressed picture format with small files and is convenient for network transmission and sharing. RAW is actually a data packet, which almost retains the original information of the photo, so it is also called "holographic digital data packet", and some people directly call it "digital negative"!

The biggest advantage of JPG format is that the file is small, but it is also compression at the expense of photo quality (maximum 100: 1). If it is only used for network transmission and sharing, JPG format photos are more than enough, but there is not much room for later adjustment, because the compressed JPG photos have less information, and they will overflow or break if they are not careful.

RAW format, because it retains the original information of photos to the greatest extent, brings greater possibilities for post-processing of photos, which is also the biggest advantage of RAW and the fundamental guarantee of photo quality.

Speaking of this, the simple thing is to mention post-processing. In my understanding, "no post-photography"! The reason is that the original photo information may not accurately express the theme you want, such as color temperature, brightness, contrast, color scale and so on. And you need to achieve your expected results through the later stage.

Let me show you a photo first:

In the above photo, I forgot to change the photo format to RAW when I was shooting, and I found JPG when I came back. This kind of photo is quite bright, and because it is a sunset, I want to warm the color temperature a little, in contrast to the cold sea water, so it is necessary in the later stage. However, due to the JPG format, the space for later adjustment is quite limited, and there is a fault in the red circle in the upper left corner. If the color temperature is adjusted again, this fault will be more obvious. Therefore, due to the JPG format, this shooting is a failure.

In the choice of format, the principle is the requirement of image quality. If high quality is required, it is best to use JRAW format. Of course, even if you shoot in RAW format, you still need to output JPG format after adjustment, because JPG is the mainstream at present, at least at present, RAW is not directly transmitted on the network, at least ordinary readers still can't open the RAW format.

For example, in the movie era, although photos were taken on film, people still saw developed photos. RAW is the "film" in the digital age, and JPG is a "developed" photo.

I am the south of the south, welcome to pay attention.

Good subject matter,

As we all know, the raw format is not a specific picture format, but the raw data that the optical signal received by the sensor of the unprocessed digital imaging equipment is converted into digital information.

What do these data include?

It contains full resolution (usually 12 bits or 14 bits) data to read the image sensor pixels of each camera. Generally speaking, basic information such as white balance, iso, aperture and shutter speed are all included, so there is a saying that the raw format can ignore white balance because it can be adjusted by itself later.

Then the photos in raw format will lose a lot of information if they are compressed into jpg after a series of post-operations. For example, a photo in raw format contains information of 100, and the remaining information after later compression into jpg may be 60;

Then, if the jpg has been shot, it will still be post-processed, but there are only 60 messages for us to post in the later stage, so the space in the later stage will be greatly reduced.

This situation is especially common in night scenes and highlights.

After raw noise reduction, the dark details can still be obvious, and the picture is still very harmonious.

If jpg is used to denoise, a lot of dark information will be lost, which may cause color fault.

So the advantage of raw is that we can explore the information in hidden photos as much as possible in the later stage.

My biggest personal feeling is the following photo I took on a farm in Victoria.

You can see that the original sky has almost no details.

Later, through later means, the whole sky was gradually excavated.

I hope it helps you!

Click on the avatar to see more answers!

There is a difference. Shooting JPG directly with a SLR is equivalent to the camera's own algorithm to produce a photo.

When using ACR to open the RAW format, ACR has its own algorithm to parse the RAW format, and then presents a jpg file through its own algorithm. However, if Freescale's Capture One software is used to parse the same RAW format file, you may get another jpg file with a color visible to the naked eye, which is the difference brought by the completely different decoding algorithms of the two softwares. Therefore, you may press the shutter once to generate three jpg files with different colors.

Judging from the current market performance, Freescale's Capture One software is the best software to analyze the RAW format. There is still a certain gap between ACR and Freescale in some aspects. To put it bluntly, ACR can only open RAW format, but Freescale's software is completely designed for photo development, and it is better than ACR in color management, retouching details and software algorithms. However, ACR is simple to use and has advantages in processing pictures quickly.

You can compare the specific differences between ACR and Freescale software and direct photos, which is obvious.

RAW is a picture format, which means "unprocessed", that is, the optical signal received by the sensor of digital imaging equipment is converted into the original data of digital information. This format not only records the metadata generated by digital camera shooting, but also records the white balance setting, sensitivity data, shutter speed, aperture value and other information during shooting. Raw is a picture format without any compression, which can also be called: digital negative.

JPEG is an advanced and commonly used compression format, which uses lossy compression to remove redundant data from images and get pictures with high compression rate but rich details. In other words, JPEG uses the smallest storage space to obtain relatively good image quality.

JPEG format can be compressed in multiple stages, and the general compression ratio is between110 and 1/40. Because this format mainly compresses high-frequency information, the higher the compression rate, the faster the transmission speed, and the relatively low compression rate can better retain color information, leaving more room for later adjustment.

According to the subject's question, if the JPEG format exported by the camera and the JPEG format exported by the raw shooting computer have the same compression ratio, the exported pictures will have the same effect, because this JPEG compression format is unified all over the world, that is to say, no matter which way, as long as the JPEG format with the same compression ratio is used, the results are the same.

The JPEG file directly output by the camera is a photo obtained by color processing and compression processing of the camera image. It keeps the parameters we set before shooting, such as saturation change, definition change, filter and so on.

When we save a photo as a RAW file, these parameters in the machine will be invalid and a "native photo" will be presented. Convert to JPEG with computer software, and keep the setting parameters of computer software.

The two exported JPEG photos look different in color and clarity.

You have two questions. The difference between SLR direct export and ACR direct export lies in the algorithm. Theoretically, exporting JPG directly from the fuselage is better than not adjusting it from ACR, because the algorithms of various manufacturers when generating JPG files will correct the defects of their cameras and lenses, and the export of ACR will not correct these defects unless further adjustments are made. Personally, if you insist on the amateur gameplay of JPG "straight out", it means that your requirements for image quality are not very high, so it is a waste of time and counterproductive to use ACR directly.