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The best thing to do with a big image that is a little blocky is to reduce the overall image size before optimizing. So if your pic was 1024x1024 and you change the IMAGE size (not canvass) to 600x600, the pic will be a little smaller but slight better in focus & detailed... Another thing which some times helps is to sharpen the image. If you have a low - med quality image to start with, it's very hard to make it much better.
The best thing to do with a digital camera is to take higher quality/bigger images to start with and then reduce them. So if you know that you want 600x600 images, take them at 1024 and shrink them AFTER you download them to your PC. This will use up more space on the camera and your computer but it will end up with better images.
The next thing is optimization. If you send a nice photo at 90% quality on a jpg, it will be huge but that same image will still look good at 60% quality and will be 1 fith the original size...
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