Michael_B Senior Member  817 posts Joined Sep 2009 More info | Dec 24, 2009 09:54 | #1 I am having a hard time understanding file sizes. I have a tightly zoomed clump of moss image, which is nearly 5.5 MB in size, but I have another image that has more in frame, albeit a blurry background, which is only 1 mb in size, I shoot in L mode and never change. Why the difference? My Gallery
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k_wakasugi Senior Member  943 posts Joined Jun 2008 Location: Probably at Disneyland right now. More info | Dec 24, 2009 09:57 | #2 Some things of the top of my head... high ISO, or in camera noise reduction both would cause larger filesizes IIRC. FS: 85 1.8 w/hood - $300!!!
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tracknut Goldmember  1,740 posts Likes: 3 Joined Jun 2005 Location: Folsom, California More info | Dec 24, 2009 09:58 | #3 With a more complex the image, the compression algorithms won't be able to work as well, leaving you with a bigger file. The two extremes might be a noisy image of that moss versus a photo of a plain blue sky. Performance/sport dog photographer
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Dec 24, 2009 10:00 | #4 In camera noise reduction is off..as that locks out continuous shooting. ISO was 100, or 200 on the moss. Reason I ask is for some reason FLICKR loves to upload 2.5 mb size images or less, the moss pic of 5+ mb, yeah it absolutely refuses it. My Gallery
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Wilt Reader's Digest Condensed version of War and Peace [POTN Vol 1]  More info | Dec 24, 2009 11:51 | #5 If a photo has large areas of rather uniform color, compression works better at reducing file size. If the same photo is taken at high ISO, even with uniform color in the photos, compression is less efficient because of all the noise in the image! You need to give me OK to edit your image and repost! Keep POTN alive and well with member support https://photography-on-the.net/forum/donate.php
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RenéDamkot Cream of the Crop  39,856 posts Likes: 8 Joined Feb 2005 Location: enschede, netherlands More info | Dec 25, 2009 11:37 | #6 You'll want to reduce the size for Flickr anyway. No need to put a 12Mp image online... "I think the idea of art kills creativity" - Douglas Adams
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