I have a following problem - I've measured with the use of manual photometer luminance of the screen expressed in cd/m2. Measurement was performed for RGB(0,0,0) and RGB(255,255,255) patterns. Thus, I've got luminance values equal respectively to 0.639 and 101.2 cd/m2. Now, taking into account resulting range created of those two values, I want to create 10 gray-scale colors equaly spread according to aforementioned luminance range, so I'll get following approximate luminance values of those colors:
[ 10.0561 20.1122 30.1683 40.2244 50.2805 60.3366 70.3927 80.4488 90.5049 100.561 ]
I was thinking about using HSB brigthness scale, but I have no clue how can I achieve values like shown above by manipulating aforementioned scale. For example, 50% brightness does not result in color luminance equal to ~55 cd/m2.
Thank you in advance for advice.
Curtis,
Thank you for your answer. But to be honest I found, that the easiest way, taking into account multiplatform approach, is polynomial 2nd order curve fit to 6 next luminance measurements for brightness 0, 20, 40, 60, 80 and 100. As result I get some kind of exponential function with brightness (%) on x axis and luminance (cd/m2) on y axis looking as I've shown in "figure_2.png" file.
Best,
Piotr
Piotr,
instead of your polynomial fit (which works not too bad in your case, I agree) the experts in the field use an exponential fit e.g. const B^gamma where it is tradition to name the exponent 'gamma'. This is remarkably accurate for many types of electrically driven radiation sources. I think it would be advantageous for you to have a closer look to the material which Curtis put together in his contribution (or to similar sources).
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