Though a gamma of 1.0 will provide a measurably linear result in cd/m^2 it is in no way visually linear. The result will, as I imagine you have found out already, be very washed out. What I think you are looking for is to achieve a perceptually linear result, where equal steps in RGB result in equal differences in perceived brightness. To do that you need to calibrated using a color space that is also perceptually linear. For this we have Lab. Lab is a perceptually linear color space and so if the tone response of the monitor is calibrated to match the L curve you will get your visually linear results.
In ColorEyes you are able to set a calibration target of L*. This, I think, is what you are wanting to do. Then, if you are measuring afterwards to validate, you want to look at the L value to verify linearity.
Sent: Friday, October 10, 2008 6:34am
Subject: How to linearize monitor output
My needs are a little strange as I am not trying to optimize monitor output for viewing. Instead, I need input values, 0-255, to the monitor (say from MatLab) to correlate to luminance values output from the screen in a linear fashion.
I know this sounds a little odd, but I research vision and the stimuli I need to present require a linear relationship between input from the software and output from the monitor.
I have ColorEyes Display Pro (v. 1.42.0) with a DTP-94 colorimeter. I have tried creating a profile using a gamma correction value of 1.0 (I thought this would generate a linear output). However, the resulting profile still outputs luminance values in a nonlinear fashion.
Any suggestions are most appreciated. Thanks!
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