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<p>[QUOTE=&quot;Leadfoot, post: 1085489, member: 2972&quot;]There are two things, primarily, that affect file size of a JPEG file:</p><p><br /></p><p>1) Resolution (the number of vertical and horizontal pixels)</p><p>2) JPG compression (the amount of compression used in forming the image -- remember, JPEG is a compression algorithm for images)</p><p><br /></p><p>However, there are a number of other lesser-known factors</p><p><br /></p><p>3) the amount of detail in the image itself (for example a pure white photo gets compressed well by JPEG, but a checkerboard with alternating white and black pixels gets much less -- it has to do with the way that JPEG stores photo detail)</p><p>4) the range of color/contrast in the image itself (similar theory as #3 above -- it has to do with compression)</p><p>5) any embedded color space (like Adobe RGB, can add several Kb to your photo)</p><p>6) any embedded EXIF data (typically very small)</p><p><br /></p><p>So while you should focus on 1 &amp; 2 to have the most effect, don&#039;t forget 3-6.[/QUOTE]</p><p><br /></p>

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