Depends on the camera sir. SOME will have an option to use less pixels, like from 5MP down to 3MP, but for the most part, you need to edit them on the PC. Usually a 'resize' will do it. I.E, in MS Photo editor, click on Image, then resize. Change it to pixels, then lower the width. I just did an 800 x 600 image, which was 1,440,000 bytes, resized it down to 600 x 450, and it went down to 810,000 bytes....and so on.
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