This image is a JPEG. JPEGs are good for compressing files while still keeping high quality images. They have a full range of colours and only discard very hard to see infomation. The amount of compression is adjustable. On the postcard you can notice a small amount of blurring in some of the smaller writing but nothing every obvious. This is a good chose for keeping a high quality without taking up to much space, so long as you don't mind lossing a small amount of detail.
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