[sane-devel] uploading color transformation matrix on HP 4c/3c --- mapping color -> greyscale

[Peter Kirchgessner]

Hi Michal,

this could be used in a GUI that is specialized to a certain backend. In 
general the backend just shows the availability of certain types of 
options. It does not tell anything about their meanings (beside some 
well defined options).

--Peter

Michal Marus(ka wrote:

> Peter Kirchgessner <peter at kirchgessner.net> writes:
> 
> 
>>You can start xscanimage and switch to matrix-type Custom. Then you see what
>>is used to enter the values for matrix-rgb. This was the reason why custom
>>matrix has been disabled. Using 9 sliders would be an alternative.
>>
> 
> when scanning in greyscale, the selection is a 3D vector. It might be good to
> have (as the GUI element) something like a view of a semisphere  of the
> unit ball in the RGB space, and have it rotated directly by the trackball (yes i
> don't use mouse). This way you just select the color of the background (which
> you don't want) and ....
> 
> 
> 
> 


-- 
Peter Kirchgessner
http://www.kirchgessner.net
mailto:peter at kirchgessner.net