Re: 10.6.7
Re: 10.6.7
- Subject: Re: 10.6.7
- From: Richard Wagner <email@hidden>
- Date: Wed, 23 Mar 2011 06:45:15 -0700
Thanks, Tom, for the explanation.
To take this slightly further, is the problem generally with the interpretation of the ICC v4 profile, such that different software might interpret the same profile differently and give different results, or is the problem usually in the way some applications are writing v4 profiles? I understand that if the definition is ambiguous it could go either way. I'm just trying to figure out where I'm likely to encounter the problem.
Thanks,
--Rich Wagner
On Mar 23, 2011, at 6:23 AM, Tom Lianza wrote:
> That is completely correct. We (X-rite) have posted this issue (bug) with
> Apple. There seems to be an issue with the LUT definition and scaling. The
> ICC spec is not fully clear and we (ICC) did not, to the best of my
> knowledge, ever provide an official reference profile for testing, so let's
> not beat up Apple on this issue. We (ICC and X-rite) are looking at
> implementation testing tools right now and some are currently under
> development.
>
> Thanks,
>
> Tom Lianza
> Co Chair ICC
> Director of Advanced Product Development X-rite.
>
>
> On 3/23/11 9:07 AM, "Iliah Borg" <email@hidden> wrote:
>
>> Dear Richard,
>>
>>> Can you explain exactly what you are doing to see this?
>>
>> I'm getting a Lab TIFF, converting it to an ICC4 profile with Lstar tone curve
>> and doing a save in Photoshop and close the file. Next, I open the icc4 file I
>> just saved in Photoshop, convert it back to Lab and do another save. All
>> three, initial Lab, icc4 RGB, and roundtrip to Lab files, look same in
>> Photoshop. First and third look same in the Preview. The RGB icc4 Lstar file
>> looks very different in the Preview. It looks like the issue is centred around
>> profiles that are following icc4 specifications.
>>
>> --
>> Iliah Borg
>> email@hidden
>>
>>
>>
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| | >Re: 10.6.7 (From: Tom Lianza <email@hidden>) |