Thanks Prof_Pixel. Both axis would be a labeling issue, the numbers are the densitometer readings. Horizontal in transmitted mode, vertical in the reflected mode.
I see what you mean, if I align by a mid tone, then the curves would indeed look better. At least for the condenser / tungsten bulb. When I look at the LED source across grades 00 thru 5 and align by the mid-tone, I see the curves again make more sense. There seems to be a "kink" in the LED curve (around a print density of 0.75) that I would like to understand better. Could this be an effect of absorption between the blue and green LED's in regards to the paper? Could an additional filter under the light source help smooth this out?
I suppose I should repeat the experiment to see if I get the same result.
Last edited by jlpape; 03-04-2013 at 08:27 PM. Click to view previous post history.