Re: relative colorimetric without black point compensation
Re: relative colorimetric without black point compensation
- Subject: Re: relative colorimetric without black point compensation
- From: Marco Ugolini <email@hidden>
- Date: Sat, 24 Jan 2009 18:46:30 -0800
- Thread-topic: relative colorimetric without black point compensation
In a message dated 1/24/09 5:24 PM, Graeme Gill wrote:
> Wilma Kay wrote:
>
>> What are the situations in which the relative colorimetric rendering intent
>> should be
>> used without black point compensation?
>
> Hmm. When you want Relative colorimetric ?
> With BPC added into the mix, it is no longer Relative Colorimetric, it's
> a pseudo-perceptual rendering intent (gamut adapted in L* but not a* and b*).
Just as a long-time user with my share of practical experience built over
the years -- and not as a scientist -- Relative Colorimetric *without* BPC
does not make practical sense to me in the overwhelming majority of
instances.
If I am converting an image from an RGB space (AdobeRGB or ProPhotoRGB) and
I notice some visible clipping, then I may resort to the Perceptual intent.
Otherwise my preferred intent is RelCol *with* BPC. I have not encountered
any instances in which it made sense, esthetically or otherwise, to blunt
the dynamic range of the converted image by generating blacks and shadows
that look too light, as they are likely to appear without BPC.
The examples that Don Hutcheson mentions in his message are very legitimate
and reasonable, but they occur very rarely, for many users possibly never.
Marco Ugolini
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