[argyllcms] Re: RGB Printer profiling and ColorSavvy CM2C

Alastair,

> Now we come to my questions:
> Is there any special reason for the apparently random placement of the 
> colour patches on the page?  (It makes scanning the patches with the 
> colormouse an "interesting" task, since with no software support, the 
> XYZ values have to be added to the .ti3 file by hand...)

I'm currently using Excel's VLOOKUP function to reorder the measurements,
using the row/column index field from the TI2 file to locate the patches.  
There is a way to disable the randomisation, but after reading 
the Argyll documentation which gives the reason for the randomisation,
I decided to leave the randomisation in. 

> What I'd like to do is use a sparse scattering of patches, and then 
> augment this in the "difficult" areas, adding some extra patches down 
> the grey axis and in typical skin tones.

This is something I want to learn about too. (and Graeme has already
kindly given me some advice off line. In fact Graeme gave me a lot
of help getting up and running)

> Finally, with both Argyll and Print Profiler (and to a much lesser 
> extent, Prism as well), images printed using the generated profile 
> generally have very good hue and saturation, but need further gamma 
> correction to get the luminance looking "right" - in terms of Gutenprint 
> controls, Composite Gamma needs to be increased to 1.1 - 1.15 or so.
> Any idea what's causing this?

FWIW, I think I might be noticing some of what you describe, although
perhaps not to the same extent. My main concern at the moment is 
that saturated blues and magentas look too light and unsaturated.
However, I must say that it is great that blues which are out of gamut
do at least come out blue, and not purple. I also think that the gamma
of the printed images needs to be increased just a whisker, but
I have not tried this yet.

Greg. (also a CM2C user)

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