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post #6211 of 6213 Old Today, 12:08 PM
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Originally Posted by zoyd View Post
No need to send me any data, I did swap dC and dH in the calculation - thanks for the catch!
You are more than welcome, I'm glad I was able to help and thanks for the updates.

I think something went wrong with the RGB levels to HSV levels transformation. I calibrated an older Epson projector to 75% saturation. The 100% primaries and secondaries are all oversaturated and have lower than reference luminance. R and C have near-perfect hue. See the attached file. All this is in line qualitatively with the RGB levels for each of the six colours. However, switching to HSV levels gives an S value smaller than 100% for both R and M. So in HSV values they appear undersaturated!

In other files B or G appear oversaturated in RGB, but incorrectly undersaturated in HSV.
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File Type: zip RGBvsHSV.zip (12.0 KB, 3 views)
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post #6212 of 6213 Old Today, 02:38 PM - Thread Starter
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Originally Posted by Slower View Post

In other files B or G appear oversaturated in RGB, but incorrectly undersaturated in HSV.
This is because the saturation error is calculated as the distance to the white point in 3 dimensions and not the distance of the projection onto the xy plane. So when you are under-luminance you will pull the saturation number down with it and why you can sometimes trade luminance for saturation (or vice-versa) in minimizing dE. If you take the example you uploaded and set the red Y such that the luminance error is close to zero the saturation bar will go positive.
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post #6213 of 6213 Unread Today, 09:54 PM
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Well, it turns out I just had my brightness set to high. This made 16 appear as a dark grey instead of black or video black. I'm still watching TV on this Toshiba 46sv709u. Experienced the artifacts that appear after adjusting color brightness, now I've solved that by increasing color while monitoring the CIE chart, thanks for the help Zoyd and the rest of you guys, now to start from scratch.
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