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<p>[QUOTE="sturmgrenadier, post: 1085551, member: 18711"]here 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 & 2 to have the most effect, don't forget 3-6.</p><p><br /></p><p>Read more: <a href="http://www.cointalk.com/showthread.php?t=151987&pagenumber=#ixzz1BnYexncY" class="internalLink ProxyLink" data-proxy-href="http://www.cointalk.com/showthread.php?t=151987&pagenumber=#ixzz1BnYexncY">http://www.cointalk.com/showthread.php?t=151987&pagenumber=#ixzz1BnYexncY</a></p><p><br /></p><p>Thanks for the information. I've tried decreasing the resolution of my pictures, but the program I used Photoscape wouldn't even let me go any lower after I reached a certain point (there is a slider that you can set, and it just locks at a certain decreased resolution level). I guess that's the program's way of telling me me that the picture would be so grainy as to be unviewable if I were permitted to reduce the resolution any further. And my file was still way bigger than the 120 KB limit I am trying to get under. And how does one improve the efficacy of the compression process? I'm thinking that coin photography just isn't my thing. I'll have to be content with seeing my coins' grades displayed in my registry set. Thanks anyway for trying to help me, though. This forum is a friendly community and great resource<img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie1" alt=":)" unselectable="on" unselectable="on" />[/QUOTE]</p><p><br /></p>
[QUOTE="sturmgrenadier, post: 1085551, member: 18711"]here are two things, primarily, that affect file size of a JPEG file: 1) Resolution (the number of vertical and horizontal pixels) 2) JPG compression (the amount of compression used in forming the image -- remember, JPEG is a compression algorithm for images) However, there are a number of other lesser-known factors 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) 4) the range of color/contrast in the image itself (similar theory as #3 above -- it has to do with compression) 5) any embedded color space (like Adobe RGB, can add several Kb to your photo) 6) any embedded EXIF data (typically very small) So while you should focus on 1 & 2 to have the most effect, don't forget 3-6. Read more: [url]http://www.cointalk.com/showthread.php?t=151987&pagenumber=#ixzz1BnYexncY[/url] Thanks for the information. I've tried decreasing the resolution of my pictures, but the program I used Photoscape wouldn't even let me go any lower after I reached a certain point (there is a slider that you can set, and it just locks at a certain decreased resolution level). I guess that's the program's way of telling me me that the picture would be so grainy as to be unviewable if I were permitted to reduce the resolution any further. And my file was still way bigger than the 120 KB limit I am trying to get under. And how does one improve the efficacy of the compression process? I'm thinking that coin photography just isn't my thing. I'll have to be content with seeing my coins' grades displayed in my registry set. Thanks anyway for trying to help me, though. This forum is a friendly community and great resource:)[/QUOTE]
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