When shooting with your T2i, you have a choice of image formats that your camera will use to store the pictures on the memory card. JPEG is probably the most familiar format to anyone who has been using a digital camera. I touched on this topic briefly in Chapter 1, so you already have a little background on what JPEG and RAW files are.
There is nothing wrong with JPEG if you are taking casual shots. JPEG files are ready to use, right out of the camera. Why go through the process of adjusting RAW images of the kids opening presents when you are just going to email them to Grandma? Also, for journalists and sports photographers who are shooting nine frames per second and who need to transmit their images across the wire, again, JPEG is just fine. So what is wrong with JPEG? Absolutely nothing—unless you care about having complete creative control over all of your image data (as opposed to what a compression algorithm thinks is important).
As I mentioned in Chapter 1, JPEG is not actually an image format. It is a compression standard, and compression is where things can go bad. When you have your camera set to JPEG—whether it is set to High or Low compression—you are telling the camera to process the image however it sees fit and then throw away enough image data to make it shrink into a smaller space. In doing so, you give up subtle image details that you will never get back in post-processing. That is an awfully simplified statement, but still fairly accurate.
SO WHAT DOES RAW HAVE TO OFFER?
First and foremost, RAW images are not compressed. (There are some cameras that have a compressed RAW format but it is lossless compression, which means there is no loss of actual image data.) Note that RAW image files will require you to perform post-processing on your photographs. This is not only necessary; it is the reason that most photographers use it.
RAW images have a greater dynamic range than JPEG-processed images. This means that you can recover image detail in the highlights and shadows that just aren't available in JPEG-processed images.
There is more color information in a RAW image because it is a 14-bit image, which means it contains more color information than a JPEG, which is almost always an 8-bit image. More color information means more to work with and smoother changes between tones—kind of like the difference between performing surgery with a scalpel as opposed to a butcher's knife. They'll both get the job done, but one will do less damage.
Regarding sharpening, a RAW image offers more control because you are the one who is applying the sharpening according to the effect you want to achieve. Once again, JPEG processing applies a standard amount of sharpening that you cannot change after the fact. Once it is done, it's done.
Finally, and most importantly, a RAW file is your negative. No matter what you do to it, you won't change it unless you save your file in a different format. This means that you can come back to that RAW file later and try different processing settings to achieve differing results and never harm the original image. By comparison, if you make a change to your JPEG and accidentally save the file, guess what? You have a new original file, and you will never get back to that first image. That alone should make you sit up and take notice.
Don't give up on shooting RAW just because it means more work. Hey, if it takes up more space on your card, buy bigger cards or more smaller ones. Will it take more time to download? Yes, but good things come to those who wait. Don't worry about needing to purchase expensive software to work with your RAW files; you already own a program that will allow you to work with your RAW files. Canon's Digital Photo Professional software comes bundled in the box with your camera and gives you the ability to work directly on the RAW files and then output the enhanced results.
My recommendation is to shoot in JPEG mode while you are using this book. This will allow you to quickly review your images and study the effects of future lessons. Once you have become comfortable with all of the camera features, you should switch to shooting in RAW mode so that you can start gaining more creative control over your image processing. After all, you took the photograph—shouldn't you be the one to decide how it looks in the end?
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