What is the difference between RAW format and JPG format? Why is the RAW format not what all users need?

   There are two photo formats that the camera can take. Perhaps 80% of photography enthusiasts only know the JPG format, but don’t know what the RAW format is. What is the difference between RAW format and JPG format? Why is the RAW format not what all users need? Can’t preview the RAW format on the computer? Next, I will lead you to explore the mysterious RAW format and ten things you must know about RAW format.

10 things you must know about RAW format photosAbout Ten things you must know about RAW format photos

01What is RAW format photos?

The interpretation of   RAW in English is unprocessed and natural, which is the true meaning of RAW files. The RAW image is the original data that the CMOS or CCD image sensor converts the captured light source signal into a digital signal, so the RAW file is also called “digital film”. The full name of RAW format is RAW Image Format, which records some metadata generated by camera shooting, such as ISO settings, shutter speed, aperture value, white balance and other information.

What is the difference between 02RAW format and JPG format?

   In one sentence, it is that the JPG format is actually processed by the RAW format. The RAW format records the original data of the shooting scene, and then after the camera itself processes the white balance, sharpening, saturation, color, etc., and then encapsulates it, it becomes a JPG format photo.

RAW and JPG photos in the cameraRAW and in the camera JPG photos

   That is to say, the JPG format taken by major brands or different product lines of major brands will be very different, because the presets processed in the machine are different, resulting in the effect of the final photo. different. This is the main reason why we often say that the color of the straight-out photos from Canon cameras is very good. The straight-out photos refer to the JPG format.

   So what is the big difference between RAW and JPG format?

   Actually, what the JPG format displays is a photo, which can also be said to be the final film, while RAW is the most primitive information packet obtained from the image sensor, not an image.

RAW files are expressed by color depth, which is bitRAW The file is expressed by color depth, which is bit

  RAW. We usually use color depth to express. The unit of color depth is bit. The color depth of general JPG photos is 8bit, which means the three colors of RGB, each color There are 256 levels, which can be combined to produce a total of 256*256*256, or about 16.77 million different colors.

  General RAW format photos, the current mainstream level is 12bit and 14bit, for example, some full-frame bodies can reach the level of 14bit. In addition, some high-end medium format cameras can support 16bitRAW format files. The color depth is higher, the information carried is more abundant, but the volume also increases, but the value is still the bigger the better.

RAW is much larger than JPGRAW is better than JPG file

   No matter which brand of RAW format file, the volume is much larger than that of JPG format photos, which makes RAW format files powerful post-production space. Because the JPG format is a processed and compressed photo of a RAW file, there is bound to be some loss, so the file size is reduced.

Differences in detail retention between RAW and JPG filesRAW The difference in detail retention between files and JPG files

   In addition to the difference in file size, RAW format files also retain richer picture details. Because it is the original data and color depth, there is no loss of detail. When the JPG format is processed and compressed, it will produce loss of details, which is inevitably produced by certain processing procedures, such as noise reduction.

   Therefore, if you want to improve the image quality of your camera without spending money, try using RAW format instead.

The suffix of 03RAW format is not RAW?

   On our computer, the display name of the RAW format is not the file name. RAW format, that is, RAW is not a direct suffix of the file. Because each brand does not use the same technical code to record RAW format files, each brand’s RAW format has its own unique suffix name, and RAW is just a collective name for these names.

The suffix of the RAW file is not. RAWThe suffix of the RAW file The name is not. RAW

   For example, Canon’s suffix is. CR2, the suffix of Nikon is. NEF, Sony’s suffix is. ARW, the suffix of Fuji is. RAF, the suffix of Panasonic is. RW2, Pentax’s suffix is. PEF, the suffix of Leica is. DNG, etc., I won’t list them one by one here.

04 what is. CR3 format?

   just introduced so many RAW file suffixes. With the release of EOSM50 mirrorless camera, Canon upgraded a new RAW format file in February 2018, with the suffix changed from the original one. CR2 became. CR3. For cameras launched since then, the suffix names of the RAW format have all changed. CR3, such as EOSR, EOSRP, EOS 200DMarkII.

The latest Canon EOS R is. CR3 RAW filelatest The Canon EOS R is. CR3 RAW file

  How to upgrade the new RAW file?

   First is the volume change. The new RAW format is divided into two, the traditional RAW file and the new CRAW file. A CRAW file is a RAW file with a small loss in image quality, but it can save nearly 50% of the space.

The volume of CRAW is much smaller than that of RAWCRAW volume It is much smaller than RAW

   and the common suffix name is. CR3 RAW files have improved latitude, allowing Canon’s follow-up products to have better performance in the later stage, and the scope of correcting photos is wider. This improvement will greatly help Canon’s future position in the professional imaging market.

Is the 05RAW format unable to view thumbnails on the computer?

   If it is under the Windows 7 operating system, the RAW format file is a file without a preview. But under the Windows 10 operating system, some RAW format files can display preview images, but some still cannot display preview images.

Not all RAW files can preview thumbnails on the computerNot all RAW files can be previewed in the computer.

   can preview, mainly depends on whether the RAW files provided by the camera can support computer preview thumbnails. Each product line of each brand is different, but Whether you can preview or not has little impact on everyone.

   The author recommends to select RAW format files and S1 level JPG format files when shooting, so that JPG can be used as a preview.

How to open 06RAW format?

   In layman’s terms, in addition to the post-production software of each camera brand, Adobe’s Photoshop and Lightroom are post-production software that specializes in processing RAW files. In Lightroom, you can directly open RAW files for post-production, and in Photoshop, you can enter the CameraRAW filter for post-production of RAW files.

Lightroom or Photoshop can open RAW filesLightroom or Photoshop can be opened RAW file

   In the comments of the previous article, the author has seen many people asking. How to open RAW files in CR3 format. Why do you ask, because… CR3 is the latest RAW format suffix among major brands, so many old versions of CameraRAW filters cannot open files in this format and need to be updated.

   In fact, every time major brands launch new cameras, the CameraRAW filter will be updated accordingly. You only need to search the CameraRAW filter on Adobe’s official website to find the updated download.

Update the Camera RAW filter to open the updated version of the RAW fileUpdate the Camera RAW filter to open the updated version of RAW files

   In addition, when you shoot all RAW files and the computer system cannot preview the RAW files, you can use Adobe’s Bridge software to perform RAW files Preview, you can also update the CameraRAW filter through Bridge.

How much is the tolerance of 07RAW format improved?

   It is said that the biggest feature of the RAW format is the tolerance. What is the tolerance? It means that the white point means that the bright light area and the dark light area can present the correct exposure at the same time. Of course, this is impossible in the camera directly outputting JPG photos, unless it is an exaggerated HDR effect. However, in RAW files, it can be corrected later. This correction of overexposure and overdarkness can be called tolerance.

RAW file has very high toleranceTolerance of RAW files Very high

  Take Canon as an example. CR2 suffix RAW files are upgraded to. After CR3 suffix RAW files, the performance of tolerance has also been improved. From then on, mom no longer has to worry about my early exposure choices. For example, when we use EOSR to take pictures, even if the picture is very dim due to an exposure error, it can still show very clear and complete details after being brightened in the later stage. The same is true when the exposure is too bright, which can be corrected later.

   These are the latitude performance of RAW format files. It can be said that in JPG format photos, if there is overexposure or too dark, it is a waste film, but RAW files provide the maximum Save it. However, the latitude of RAW files is not unlimited, so you should not make mistakes too much during the early shooting.

08 What is full-pixel dual-core RAW?

   Full-pixel dual-core RAW is a very amazing RAW file, which is also a black technology unique to Canon. Full pixel dual RAW is actually to make the post-production space wider, it is a technology that came with Canon 5D4. The principle is that a RAW file records various image information of 2 photodiodes in 1 pixel, so that you can rely on Canon DPP software to adjust the three contents of the image in the later stage, including “resolution compensation” and “blurring” “Offset” and “Reduce ghosting”.

full pixel dual-core RAW technologyFull-pixel dual-core RAW technology

  From the beginning of 5D4 to the later EOSR, this technology is available. The name of the full-pixel dual-core RAW is DPRAW. An ordinary RAW file is about 30MB, and the volume of this DPRAW has soared to 60-70MB. It can be seen that the information it records is exactly twice.

09 How to play full pixel dual-core RAW?

   Canon officially announced that full-pixel dual-core RAW can mainly achieve the three functions of “resolution compensation”, “blur shift” and “ghost reduction”. After the full-pixel dual-core RAW function is turned on in the camera, the RAW file size shot by the camera will double, as described above, because this DPRAW file will not only record the original image information, but also add additional information about the subject. In-depth information.

The volume of full-pixel dual-core RAW is twice that of ordinary RAW, the information retained It's also twiceThe volume of full-pixel dual-core RAW is twice that of ordinary RAW, and the retained information is also twice as much.

   Next, let’s talk about the role of these three full-pixel dual-core RAWs.

   resolution compensation, you can perform a slight focus plane correction. For example, when we are shooting with a large aperture or telephoto lens, we may encounter a focus error, such as the model’s eyes are slightly blurred. At this time, we can use this function to correct it and let the model’s eyes regain Sharp images.

Full-pixel dual-core RAW can fix some shooting errorsfull pixels Dual-core RAW can fix some shooting errors

   blur offset, this function is mainly to help slightly adjust the blur part, such as the large aperture blur leaves blocking the model’s eyes, this adjustment can slightly offset these The blurred leaves let the eyes out.

   Ghost reduction can reduce the influence of ghosts in the screen to a certain extent.

   Finally, I want to talk about it in particular. If you want to open DPRAW and the above-mentioned functions, you need to use Canon’s official DPP software. There is no other way. You need to enter the serial number when downloading the software.

10Should I use RAW format when taking pictures?

   Finally, we come to the most difficult question, should I use RAW format when taking pictures? This answer cannot be generalized as yes or no, but varies from person to person.

  For professional photographers, post-production professionals, and photography enthusiasts, the RAW format will definitely be used, because for them, the early and late stages of photography are equally important and both are indispensable.

It's just to take a picture as a souvenir, there is no need to open RAW formatJust take a picture It is necessary to enable the RAW format

   For ordinary users, such as home users and travel users, the camera may be used for recording. You don’t need to perform post-operations. The photo is only for recording and souvenirs, so there is no need to enable the RAW format, because Occupy storage space is not used. Canon cameras used by many users are very effective in optimizing JPG straight out photos, so there is no need for post-production. Naturally, there is no difference if the RAW format cannot be opened.

   In fact, the RAW format is created for post-production. If you need post-production, then open it; if you do not need post-production, then close it. Of course, it is not an absolute opening and closing. For example, I want to post the photos of this trip. Then I will open the RAW format during this trip, and I can close it again during the next trip. This has to be considered by myself. Anyway, it only takes a few to open and close. Second adjustment time.

If you are a photographer, then it is recommended that you open the RAW formatIf If you are a photographer, it is recommended that you turn on the RAW format.

   For those who like photography, the RAW format is not a mandatory type of photo, but it is a format that can help you upgrade the viewing effect of photos for free. The RAW format improves not only the image quality, sharpness and latitude, but also has more functionality, such as full-pixel dual-core RAW, which can help photographers correct some small mistakes in the early shooting. When we used the RAW format, the error tolerance rate during shooting also improved a lot.

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