FreeLists / argyllcms / [argyllcms] Re: B2A mapping of out-of-gamut colors

["Thomas Baumann" <thomas@xxxxxxxxxxx>]

> Thomas Baumann wrote:
>> This corresponds to the inverted A2B table with CAM Jab mapping (switch
>> -b): [...]
>>  $ xicclu -fif -ir -a -b SP3800_PSPP_2880_ARG2.icc
>
> I think you confused the meaning of the b switch, see
> <http://www.argyllcms.com/doc7/xicclu.html#b>
>
> Klaus

Hi Klaus,

according to the command line help the meaning has changed since the last
official release - I am using Beta 7 because it supports the DTP20. The
former -b switch is now -m (merge).

As to unreal colour, I know that Lab 9/0/80 is not a "real" colour. But
you get there easily if you change the brightness of a real photograph in
Lab mode. Actually, I noticed this tone reversal effect in a shadow part
of a real photograph. I only chose the test image to better demonstrate
the effect.

If I convert from Lab to ProPhotoRGB in Photoshop (Adobe ACE) before
printing, all is well. It would be just nice, if Argyll's B2A1 table would
provide a similar mapping directly from Lab...

Thomas