Thanks for all your replies, much appreciated.
I have the source of the script and the reference values are contained in
it.
// Pro Photo RGB Reference
this.SetReferenceRGB( 0, 81, 66, 52); // dark skin
this.SetReferenceRGB( 1, 160, 138, 116); // light skin
this.Set... for rest of patches
These need altering to new values to reflect the SG card. Now the SG file
already has the relevant info in it, but not in the same form
Parts of the SG file...
MEASUREMENT_SOURCE "WhiteBase=Absolute Filter=No"
ILLUMINATION_NAME "D50"
OBSERVER_ANGLE "2"
SampleID SAMPLE_NAME RGB_R RGB_G RGB_B nm380 nm390
nm400 nm410 nm420 nm430 nm440 nm450 nm460 nm470
nm480 nm490 nm500 nm510 nm520 nm530 nm540 nm550
nm560 nm570 nm580 nm590 nm600 nm610 nm620 nm630
nm640 nm650 nm660 nm670 nm680 nm690 nm700 nm710
nm720 nm730
END_DATA_FORMAT
NUMBER_OF_SETS 140
BEGIN_DATA
1 A1 242.81 244.08 241.52 0.1365 0.2349 0.4385
0.6837 0.8452 0.9077 0.9231 0.9273 0.9322 0.9335 0.9337
0.9350 0.9345 0.9337 0.9335 0.9313 0.9335 0.9353 0.9317
0.9319 0.9276 0.9262 0.9239 0.9216 0.9209 0.9201 0.9219
0.9245 0.9268 0.9237 0.9214 0.9211 0.9219 0.9229 0.9234
0.9278 ...
Full file at:
<http://www.northlight-images.co.uk/external/ColorCheckerSG.txt>
So what I need is a way of converting the 24 relevant patch values from the
SG target file to put into the script.
As you can see, there are RGB values available, but not in the same space.
Can anyone point me to software that I can do the conversion with, or even
the appropriate formulae for the conversion (there's only 24 sets to do :-)
Or for that matter if this just won't work, could anyone tell me why?
bye for now
Keith Cooper
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