Understanding the RAW File Format

understanding RAW

At some point, you are going to be introduced to the RAW file format, whether it is through an online forum or website, or face-to-face with your photo buddies.

Many photographers approach shooting in RAW with fear and trepidation - I see it every day, and I also remember how confused I was by the concept at first. I wasn't necessarily afraid, but I definitely did not understand what RAW was and how it could help me.

In this post, I am going to unpack the mystery of shooting in RAW and show you that not only is shooting RAW easy, but it can also give you much more flexibility in your editing.

This post is not intended to make you think that RAW is the only way to go, but it is intended to tell you what RAW is, along with some of it's positives, as well as some potential drawbacks. In the end, it's up to you whether or not you want to make the switch from JPEG to RAW. What I will tell you, though, is that it is not nearly as complicated as you may think. 


After having a discussion in our forum about what everyone finds to be confusing or scary about RAW, the most common reason was this: people have been told early on in their journey that shooting in RAW is complicated, and that, since they were new to photography at the time, that they should shoot in JPEG to keep things simple.

While I sort of agree with that idea on some level, I also feel like it's a very general assumption, and also quite limiting. It seems to me, the best time to learn to shoot RAW is from the very beginning, before you get set in your ways - the beginning of your journey is the time when you should be developing good habits! If you tell a beginner, "As a beginner, you should stay away from XYZ because it's really complicated..." most people will be turned off of the concept and maybe even hesitant to approach it in the future. That might be one reason why the rumor that shooting in RAW is complicated has been created - so many people are told early on that it's complicated, therefore many people believe it is!

Another common reason why people are initially not interested in shooting RAW is because of storage issues, since RAW files are much larger than JPEG. While this is true, I will address this concern later on more in depth, but file size, in this day and age, should not be a deterrent - storage space has become relatively inexpensive. 

For every photographer I have come across who is hesitant to shoot in RAW, I have come across even more who couldn't imagine shooting any other format. The common thread is always something along the lines of, "I was afraid of shooting RAW at first, but one day I tried it, saw how easy it is and how much more control I have in post-processing, and haven't looked back!"

Here at Pretty, we want to get you excited about shooting in RAW! Let's get started and take a look at what RAW is all about...


You know that film photography uses negatives, right? All of the information that was recorded by the camera is on the piece of film that was in the camera at the time the photo was made. In the same way the image information is contained in the negative in film photography, in digital photography, the image information is contained within the RAW file - it is a file that contains all that the camera's sensor "saw" when the image was made, with minimal compression or file manipulation. Just like all of the image information is contained in the negative in film photography, in digital photography, all of the image information is contained within the RAW file.

On the other hand, the JPEG files that your camera defaults to are highly compressed files, and because of this compression, they lose some of their original file information.

What is "compression," though?

Compression simply refers to the amount of data that is contained in a file such as a JPEG or PNG. A JPEG is a highly compressed, or "lossy" file format. It does not contain the same amount of information as a RAW file, which is considered a "lossless" format. We'll talk more about what information is compressed in the following sections, but for now, simply consider the fact that a RAW image file contains more information than the standard JPEG.

More information equals more freedom in your post-processing.

A RAW image file is not truly an image yet. It is digital information that needs to be converted to a viewable image format. Just like a negative in film photography, the RAW image file is not yet a usable image - it has to be manipulated to create a (traditionally) usable image. So, instead of having film negatives made into prints in order to see our images, we are converting a file to a format that we can look at on our computers, and either share it online or print it.

You're probably wondering why, if the RAW file is not viewable, can you see an image preview on your camera's LCD screen after you make the photo. The answer is this: when shooting in RAW, the image that appears on your camera's LCD screen is a JPEG preview of the RAW image. So, instead of showing you the RAW file (again, you can't actually view the RAW file itself) your camera is taking certain information from the RAW file, and converting it to a JPEG preview that reflects what was recorded in the RAW image file.


A JPEG image is an image file that can be viewed across devices without the need to be converted to a viewable file format, whereas a RAW file is not yet a universally viewable image file. A RAW file is an electronic bundle of information that needs to be converted to a format such as a JPEG, TIFF, DNG, etc. in order to view and edit it in Photoshop or Lightroom.

After being converted to a DNG (short for "Digital Negative") and imported to either Adobe Camera Raw or Lightroom, images shot in RAW appear to have less contrast and are typically not as sharp as a JPEG. They also appear less saturated. All of this is easily adjusted in post-processing.

Here is a comparison of a RAW file and a JPEG, both untouched, straight out of the camera:

As you can see, the RAW image has less contrast, clarity and saturation than the JPEG. This is because the RAW file is not compressed - it is exactly what the camera's sensor "saw," whereas the JPEG is a highly compressed version of the RAW image. Your camera's software discards certain information in order to compress a file while simultaneously editing the image in camera to look the way the camera "thinks" it should look based on the software in your camera, therefore the compressed JPEG will look slightly different than the RAW file.

There is a common misconception that RAW requires much more editing than JPEG. While RAW does require one or two more steps in your workflow than JPEG, the steps are minimal and not time-consuming. We will get to that in the next section, but the "extra" editing required for a RAW image can take only a matter of seconds to perform, and with presets both in Lightroom and Adobe Camera RAW, your RAW images may only need one click to adjust contrast, clarity and saturation.

Since RAW files are not compressed, they are much larger files than JPEGs, therefore they will take up more space on the memory card in your camera, so you will need a larger memory card to shoot in RAW.


So far, we have mainly been comparing the basic differences between RAW and JPEG, so let's now discuss some of the benefits of RAW over JPEG.

Dynamic Range

First, and arguably most importantly, like we have already discussed, RAW files give you much more control in editing than a JPEG will. Since RAW gives you a wider dynamic range, the values ranging from whitest white (highlights) to solid black (shadows), you will have more freedom to adjust exposure without running into pixelation. For example, if you have an underexposed RAW image, you can increase the exposure much more than you could in a JPEG. A JPEG will give you pixelation and digital noise in the shadows much sooner than a RAW image.


Do you ever find that the color in your photos seems really "off" from what you saw with your eyes? While replicating exactly what we see with our eyes is nearly impossible, you can come very close when shooting in RAW.

RAW image files have the ability to contain anywhere from 4096 - 16384 different colors, whereas a standard, compressed JPEG only contains 256. This also gives you more room to tweak the color of a RAW image in post-processing. 

White Balance

Since a RAW file gives you more freedom with color and dynamic range, correcting the white balance of a RAW file is much easier, fine-tuned, and will give you more natural results than correcting white balance on a JPEG.


First, you will need to set up your camera to shoot in RAW, and this is done through your camera's menu. Your camera defaults to shooting in JPEG, so you will need to change your settings when you want to shoot in RAW, or when you want to switch back to JPEG. Below are examples of where to change the file type on a Canon 5d Mark ii and a Nikon D90.

On the Nikon, press the Menu button and navigate to Image Quality, then select NEF (RAW). As you will see below, you can choose to also shoot in RAW + JPEG. When you are new to shooting in RAW, you may feel more confident shooting in both until you are confident enough to shoot in RAW alone.

You will also see RAW + JPEG Fine, Normal and Basic, which are varying levels of compressed JPEGs, with Fine being the highest quality (and also the larger of the JPEG file sizes) and Basic being the lowest (and smallest).

Keep in mind that shooting RAW + JPEG will take up a lot of space on your memory card, so making the choice early on to shoot in just RAW will save you a lot of space. 

Setting up your camera to shoot in RAW on a Canon is similar to Nikon, except the RAW + JPEG option will have L, M, and S for JPEG, which stands for Large, Medium and Small JPEG files - similar to Fine, Normal and Basic on the Nikon. To shoot only in RAW, make sure that the red box is around RAW, and that the straight line is selected in JPEG:

If you still have questions about how to set your camera to shoot in RAW, or if you have a camera model that was not covered here, please refer to your camera's manual.

Next, all you need to do is shoot the same way you normally would, taking every measure to get your shot as perfect in-camera as possible. The fact that you are shooting in RAW absolutely does not affect the way you shoot.

Even though RAW gives you much more leeway in your editing, you will still need to strive to get your shot correct in camera. A common misconception about shooting in RAW is that you can simply use Auto White Balance and everything will come out great. While this is true - you can use Auto White Balance and easily adjust any incorrect tones in post - getting your white balance right in camera will save you a step in your editing workflow.

Here is an example of a RAW file shot with the white balance set to Auto and Daylight:

The Auto White Balance image is not too bad, but it is more on the blue side than what the flower and table actually look like. With the white balance set to Daylight, the image looks much more true to what the setup looked like in reality. Again, this is something that can be quickly changed in post, but I encourage you to save yourself a step and get it right in camera.

The main thing that will change for you when shooting in RAW instead of JPEG is that you will need more storage for your RAW files on your memory card that you would for JPEG files. So, if you are shooting with an 8GB memory card and having a wedding coming up, you will want to upgrade to a larger memory card, and you will be better off to purchase more than one. 

Once you have finished your shoot and it's time to edit, you will need to import the RAW images into a program on your computer that will convert the image from RAW, to a file you can edit, such as DNG. DNG stands for "Digital Negative," playing off the idea of a film negative. This is Adobe's standard RAW conversion format.


In Photoshop, when you open the files, Adobe Camera Raw (ACR) will appear. At this point, you can make adjustments to your image. If you are going to be using actions, textures/overlays, and brushes, you will then follow the prompts to open the image in Photoshop once you have completed your basic adjustments.

In Lightroom, you will simply import the images to your Library.

When you have imported the files into your editing program of choice, you will see that the images on your screen look different than they did on your camera's LCD screen. Do not panic, this is how it works, and it's totally normal! Remember our straight out of the camera RAW and JPEG comparison earlier? That is exactly what you are seeing here. In Lightroom in particular, you will see the image imported, and then suddenly it will look different. This is because Lightroom is switching from showing you the JPEG preview to the original RAW file. This may sound a bit confusing at first, but once you see it happen in Lightroom, you'll know exactly what I mean.

When you have finished editing, you can then export/save as a .TIFF, .PSD, .JPEG, etc., depending on the needs of your client or your printer. At this point, if you export as a JPEG, you won't lose the edit that you made to the RAW image - in other words, your exported/saved image will look like your final edit, NOT the image that you originally imported.

The majority of photographers who shoot in RAW prefer to save/export as a DNG for their own records. You may find that your printer requires a JPEG or a TIFF, but for your own records, exporting/saving as a DNG will take up less storage space on your computer than a file such as a TIFF or a RAW file, but it is still considered a relatively lossless file format.


This is a hot question and is always up for debate. I understand the arguments for why you should always shoot in RAW, and I understand why some photographers shoot in JPEG on some occasions. I really do believe that it comes down to personal preference on this issue, though, so I am not going to tell you that there are times when you shouldn't shoot in RAW, nor am I going to tell you that you should always shoot in RAW - that is up to you and what you feel is best for the situation. Let me give you an example of a situation where you may not want to shoot in RAW:

During an impromptu shoot with friends and their children, you only have an 8 GB memory card with you. Since you weren't really planning on doing much shooting, you aren't as prepared as you would be before a regular, planned shoot with a client. It is a situation where you could either shoot in RAW and have around 150 shots to work with, or you could shoot in JPEG fine (the highest quality JPEG setting) and get around 500 shots. Anyone who has kids knows that erring on the side of 500 shots will give you way better odds than 150! Also, if you have goo light and know how to get things right in camera, you will not need to do a lot of editing, so the RAW format is not as important here. So, because a) you are in a pinch and only have an 8 GB and b) you have great light where you can nail your shots in camera, you may want to go with JPEG over RAW.

So, with that example in mind, know that there will be some situations where it will be more practical and more beneficial for you to shoot in JPEG.


I hope that this guide has encouraged you to give shooting in RAW a try, or at least sparked your curiosity! As you can see, there is nothing to fear when shooting in RAW, and it is almost exactly the same as shooting in JPEG, you just have more control in your editing - what's not to love about that?

If you are still not 100% comfortable with diving right in to shooting in RAW, then ease in to it. If you are unsure, then I wouldn't suggest that the first time you shoot in RAW be a wedding, or even a full session for that matter. Practice around your home, and with your friends and family until you get the hang of how it works.

For easy reference, here is a chart that compare the differences between RAW and JPEG:

Do you have any questions about shooting RAW? We love hearing from you! Please join us in our private Pretty Photoshop Actions  Facebook group  and also at the Pretty Forum!


Leave a Comment