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Old Nov 26, 2007, 9:21 PM   #1
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Noob question. Thank you for your patience. I purchased a SD870IS one week ago. It's an 8 Mega-pixel P&S. Can someone educate me as to why the largest size pic I've taken is only3.5 Megs. Shouldn't my file sizes be much larger? I'm shooting in Auto SL. TIA.
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Old Nov 29, 2007, 11:02 AM   #2
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Have you set the image size to large and quality to fine? These settings will capture the greatest number of pixels resulting in the largest file size.
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Old Dec 2, 2007, 8:41 PM   #3
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Set to superfine and large. Still haven't taken a pic over 4mb. Strange...
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Old Dec 28, 2007, 11:40 PM   #4
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Hi shuttershy,

The JPEG compression in the SD870IS is quality-based ... the algorithm set the compression rate with the difference between the lossless image and the compress one. Typically ... with the JPEG algo if the image containe a large number of high spatial frequency (like noise) the compression will less effective (the file size more large). So the bottom line is that the file size do not reflect the real "quality" of the image ... in fact if the file in very noisy (low quality) the file size will more important.

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