Re: [Lcms-user] Re: black point compensation using tifficc

[<as...@fu...>]

Am Samstag, 21.06.03 um 17:17 Uhr schrieb Gerhard Fuernkranz:

> it looks like the linear BP scaling also reduces the saturation. 
> Additionally, for my taste the midtones are a little bit too dark. 
> After printing a dozen of testpages, I think the subjectively best 
> print of my testimage I obtained by slightly increasing the saturation 
> (+30), applying gamma 1.2 to brighten up the image slightly, BP 
> scaling (in linear gamma space) and then applying the relcol intent.

Gerhard, this appoach is similar to mine. If the destination colorspace 
is small (black point about 20 and more) and perceptual gamut 
compression does not satisfy the intention, applying gamma with 
saturation before relcolBPC transform gives good results. Therefore, 
this is why I think non-linear scaling with saturation remapping is an 
approach towards "neutral gamut mapping", because mapping is still 
based on colorimetry with perceptual adjustments.

Regards, Andre