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Old Friday 11th November 2011, 23:40   #1
bobmoose
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Question RAW to JPEG conversion.

Hi all
Just a technical question to satisfy my curiosity.When a photo is converted from RAW to JPEG is there any difference which software is being used?For instance is Photoshop conversion different than DPP(Canon software) conversion? Does all conversion software use the same compression algorithm? What about conversion of RAW to TIFF ? I haven't noticed any difference except for the expected IQ loss due to reduced file size.
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Old Saturday 12th November 2011, 20:39   #2
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The maths used in Jpeg compression has a wide range of variables, different programs change different things to acheive their compressions. Some programs rate their Jpeg quaility 0-10, some 0-12, some by percentage. Photoshop uses a different conversion in the "Save for web" than in "Save As...". More on the subject here http://www.impulseadventure.com/phot...mpression.html

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Old Saturday 12th November 2011, 21:36   #3
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Thanks for the link.
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Old Sunday 13th November 2011, 01:52   #4
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Additionally, different Raw converters use different color spaces internally in the program, and in some of them going from one version number to the next can mean an upgrade in color space.

Furthermore, some cameras use soft correction of some lenses and even in those that don't, you may be able to add soft correction in the raw conversion; but in both cases, that soft correction may be more or less easy to include in your workflow depending on which raw processor you use.

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