Quote:
Originally Posted by
Coolme
I don't understand for example what 100% is (of what?) to have my target Y.
100% gray (white) is the brightest measurement in ColorHCFR when you measure a grayscale series. The "gamma Y" line in ColorHCFR tells you how bright the other levels should be between black and white. The "Y" number in ColorHCFR indicates brightness of your measurement. If "Y" matches "gamma Y" then your measurement is at the intended brightness for your target gamma.
If your measured "Y" matches the "gamma Y" then the gamma graph will show your measurement on top of the reference line. Same thing with the luminance graph, if your measured "Y" matches the "gamma Y" then the luminance graph will show your measurement at the reference line. If your "Y" is higher than "gamma Y" (measurement brighter than intended), then the luminance graph will show the measurement above the reference line and gamma will be low for that measurement. If your "Y" is lower than "gamma Y" (measurement darker than intended), then the luminance graph will show the measurement lower than the reference line and gamma will be higher than reference for that measurement.
So "Y" indicates the overall brightness of your measurement, but it's also possible to break up brightness into red, green, and blue parts. The "R", "G", and "B" numbers in ColorHCFR are similar to "Y", and they indicate the brightness of red, green, and blue. If "R", "G", and "B" are equal you have gray. If "R", "G", and "B" are not equal the relationship will be shown as being higher or lower than the 100% reference line on the RGB levels graph. If in a perfect world you were able to get all the "R", "G", and "B" measurement data to match "gamma Y", that would mean that both the gamma and RGB levels would be at their intended targets. If "R", "G", or "B" is higher than "gamma Y" it means the measurement has too much red, green, or blue, and if "R", "G", or "B" is lower than "gamma Y" it means that red, green, or blue is not bright enough for the chosen gamma. If you really want, just buy CalMAN and it will basically show you the same information on the luminance or absolute RGB charts.
Edit: The comments about how "R", "G", and "B" relate to "gamma Y" assume that the 100% measurement (white) is near gray.