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When you save an image under Photoshop you get the JPEG options menu. This offers you "Image Options" and "Format Options". Under "Image Options" you can
specify a number ranging from 0 (minimum) to 12 (maximum). I have a Nikon Coolpix 8700, and have been in the habit of saving any pictures I edit at ‘9’ – "you don’t want to lose any quality" –, but have noticed that frequently this gives a substantially larger file than the original.
So I did some tests, and saved a relatively sharp photograph, trimmed to 1080 by 1300, at every quality from 0 to 9. The resulting file sizes ranged fairly evenly from 110KB to 620KB. When I printed the files with qualities 0, 3, and 6, at 300 dots per inch (corresponding to an 8" by 10" print of the original photo) compression artefacts were visible, but not obvious, at 0, just visible at 3, and pretty well invisible at 6 At 150 dots per inch, the artefacts were quite noticeable at 0, and just noticeable at 3. On the screen they were obvious at 0, and noticeable at 3.
Under "Format Options"you are offered Baseline ("Standard"), Baseline Optimised,
and Progressive, with "Standard" the default.
Is there any generally accepted setting for the quality? And is there any good reason to change the format options from "Standard"?
James McNangle
specify a number ranging from 0 (minimum) to 12 (maximum). I have a Nikon Coolpix 8700, and have been in the habit of saving any pictures I edit at ‘9’ – "you don’t want to lose any quality" –, but have noticed that frequently this gives a substantially larger file than the original.
So I did some tests, and saved a relatively sharp photograph, trimmed to 1080 by 1300, at every quality from 0 to 9. The resulting file sizes ranged fairly evenly from 110KB to 620KB. When I printed the files with qualities 0, 3, and 6, at 300 dots per inch (corresponding to an 8" by 10" print of the original photo) compression artefacts were visible, but not obvious, at 0, just visible at 3, and pretty well invisible at 6 At 150 dots per inch, the artefacts were quite noticeable at 0, and just noticeable at 3. On the screen they were obvious at 0, and noticeable at 3.
Under "Format Options"you are offered Baseline ("Standard"), Baseline Optimised,
and Progressive, with "Standard" the default.
Is there any generally accepted setting for the quality? And is there any good reason to change the format options from "Standard"?
James McNangle
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