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By default, your camera shoots in JPEG format. Established by the Joint Photographic Experts Group, JPEG is a compressed image format; that is, it takes the original image data that your camera captures, and it crunches it down, so that it takes up far less storage. JPEG compression is a lossy compression scheme; that is, there is a loss of quality when JPEG compression is applied to an image. So the more compression you apply, the more your image is degraded. Most cameras give you a few different JPEG conversion choices.
Some of those choices compress more than others, and therefore degrade your image more than others. Your camera also captures a certain number of pixels. When shooting JPEG images, most cameras give you the choice of shooting at lower pixel counts. So you might be able to save an image that's only half size, for example. This is another way of saving space on your storage card. Finally, some cameras also give you the option to shoot in RAW mode, a non-compressed format that offers a lot of editing advantages over JPEGs.
You control image quality from this very first item, on the very first page, of the very first category of menus. It's one called the Image quality. You can see right now I'm set to best quality large JPEG. I'm going to hit the Set button to go in here, and I get a little summation of my current settings. I'm currently at large; that's full size image, which is 22 megapixels. That's 5760 by 3840 pixels. And what I've got down here are a couple of different options. If I want to change the JPEG quality, I can turn this rear wheel, and what's happening here is I'm lowering first my JPEG compression.
So this is still the same pixel size. If you watch up here as I change, the pixel size is not changing. What's changing is my quality thing is getting degraded here; it's looking more jagged. As I continue to move over, I get to the medium size, which is 9.8 megapixels, and here are the pixel dimensions, and I have two compression settings there. So these are going to be the same pixel counts, but the higher quality is going to actually be a larger file size, because it's not compressed as much as this one. Then I get to a small size, which is 5.5 megapixels, and I have two quality settings there.
Then I get to a really small size, 2.5 megapixels, and I don't have any choice of JPEG compression there. And then finally, I get down to a very small size, a third of a megapixel, and again, no compression settings there. This little thing right here is showing me -- that's a little icon for my wheel right here -- it's showing me which wheel to turn to change these. Now, I can also set it to not shoot JPEG at all. This means currently I have no actual Image quality settings, and the camera is not going to let me do this.
I have to pick one or the other; either JPEG, or RAW, or both. If I turn the main dial up here, I can select a RAW format. So this is RAW at full pixel count, 22 megapixels, or I can go to a medium size, which is 10 megapixels, or I can go to a small size, which is 5.5, and I can see the pixel dimensions up here. Now, I don't have separate compression settings here, because RAW files have no compression. So if configured this way, I'm shooting a full pixel count RAW image, and no JPEGs.
But if I want, I can turn this on, and now I'm shooting a full pixel count RAW image, and a full pixel count, high quality JPEG image. Or maybe I want to shoot RAW files, and something really small for the Web. So I can configure these any way that I want. I can shoot a RAW, and no JPEG. I can shoot RAW, plus any one of these JPEGs, or I can shoot no RAW at all, and just these JPEG files. So this is a really streamlined, easy way to configure exactly of what image formats you want.
Notice that if you have multiple cards in the camera, before this, you're going to have another screen, and I'll explain how that works in a separate movie.
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