Re: `Lossless' retroactive embedding of color profile (avoid JPEG recompression); basic color profile theory
Re: `Lossless' retroactive embedding of color profile (avoid JPEG recompression); basic color profile theory
- Subject: Re: `Lossless' retroactive embedding of color profile (avoid JPEG recompression); basic color profile theory
- From: Marco Ugolini <email@hidden>
- Date: Wed, 02 Aug 2006 00:09:14 -0700
In a message dated 8/1/06 11:54 PM, john castronovo wrote:
> From: "Graeme Gill"
>> Certainly if you continue to open and close (decompress
>> and compress) the same JPEG file with the same quantisation
>> table (usually the same program quality setting), then there
>> is no additional loss for each round.
>
> Suppose the new file is saved with a better quality setting than the
> first. I wouldn't expect it to get better of course, but could the
> change in settings actually do some damage?
Even the highest quality setting in JPEG causes a detectable amount of
damage to a file, which is compounded with each successive action of saving.
While this amount of damage at the highest setting is not serious for most
purposes (and less than it used to be a few years ago), it may become
noticeable after being compounded by a number of saves.
It's best to save in PSD or TIFF format, not to make things worse.
Regards.
--------------
Marco Ugolini
Mill Valley, CA
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