Sean to answer you question about lossless compression only. The CPT file
format is a proprietary lossless file compression. To test any degradation
one has to use the CPT file format and compare it to an uncompressed TIF
file.
"Sean" <azurepicTHISISFORSPAM@yahooSPAM.com> wrote in message
news:47e04f15_2@cnews...
> Jeff,
>
> I have tested your file, never making it into a jpg, to remove that from
> the
> equation and re-attach it after multiple saves in PP. It has clearly
> degraded. So I attached my default color management settings for CMYK
> work,
> though I leave files in RGB until conversion is needed.
>
> Then I repeated the test (test2.png) with the color management
> import/export
> settings changed as per the 'losslesscm' screen capture. There appears to
> be no change after multiple saves.
>
> So, here's my thinking (obviously flawed somewhere): I left import color
> management on since I thought that would improve my likelihood of getting
> extra color info when importing files from cameras and other sources. I
> left export color management off because any jpgs exported with this on
> are
> huge with all that color info included. I do web work from time to time
> and
> also save out files for email to other people, etc. I had no idea that
> save
> and load, open and close with CPT's and CDR's were causing color changes
> to
> my files.
>
> As for the other comment, that starting with jpg files means they continue
> to degrade... are you guys suggesting that I need to explicitly convert a
> jpg into a CPT or tiff before I import it into DRAW? Or save it as a tiff
> before saving as a CPT? I don't see that as a likely or realistic
> workflow.
> The CDR and CPT file formats are supposed to be lossless, and I've never
> read that it matters what original format the files are in. I have been
> using DRAW/PP since version 9, nearly nine years now, so I'm not a total
> newcomer.
>
> If this is truly the case with color management, that either both import
> export arrows need to be on (assumption, not tested) or both off (tested),
> then there should be a warning when we set it otherwise. In fact, I
> notice
> that the 'Optimized for desktop printing' color management settings have
> only the import arrow enabled. So using this profile, we could also
> expect
> bitmap degradation (not tested)?
>
> I appreciate your input.
> Sean
>
> "Jeff Harrison" <test@test.com> wrote in message
> news:47e01451$1_3@cnews...
>> Hi Sean,
>>
>> I applaud your efforts to want to ensure everything is OK.
>>
>> Here is a test file I'd like you to quickly try, you are familiar with
>> your testing process.
>>
>> It's here are lossless 24 bit PNG, and covers pretty much the whole
>> spectrum. If anomalies appear, they should be revealed more readily in
>> this case.
>>
>> I see the blotches in your prev. examples, but for the moment let's
>> leave jpeg out of the equation - at every stage.
>>
>>
>> Jeff
>>
>
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