Originally Posted by Oscarilbo
Love the newest calibration disc, but its also a bit frustrating since I bought it mainly to calibrate my Projector’s HDR mode to my grey screen, only to find there’s no recommendation to tweak almost anything. I used it to get brightness right but I’m having now trouble for color. And don’t get me wrong, I knew going from a white screen to a grey screen would meant some compromises, but I think there’s room to improve color too.
It still looks great but in reality colors have been somewhat muted in comparison, less vivid and punchy, which is natural because the grey screen, but I hoped I could fix that with the Spears and Munsil HDR calibration disc, but havent found anything that helps since blue filters are needed but I think those work only for SDR.
As I said, thanks to brightness tweaking details are great now, but in dark scenes tones are too dark, and I think there’s some room to improvement there. My projector has RGB gain and offset options in the Color temperature section, I guess that’s where it lies the key to up color brightness??
Here's a direct example; 1st image I took it when the screen was white. 2nd image now is grey and of course after some calibration with brightness contrast. Both in HDR mode, 4k bluray disc. I know the difference is minimal and understandable, but I think colors could be a little clearer with some tweaks.
Thanks in advance
Thank you for purchasing the disc.
There is a lot of confusion from everyone when it comes to what the color and tint controls do. First, color does not adjust color
What is adjusts is the color decoder. Specifically it alters the 3x3 matrix used to convert YCbCr from disc into RGB for viewing. That is it. This is a fixed matrix. There is no reason for a color control as this should not change.
You may wonder why there is a color and tint control on a TV. The reason is history and perceived value. Back in the days of CRTs, the color decoder was made up of analog parts and they would drift over time. The color control would allow you to compensate for the drift. With modern displays, this is not needed at all but is included because if it were missing, people would complain it is missing.
Your issue is grayscale / white balance / color temp. With a projection system, the color on screen is not only impacted by the screen material, but also the room. Light bounces off the screen, on to the walls and some of that will contaminate the screen. To fix this, you need to adjust the grayscale. To do this, you need to use window test patterns in combination with a colorimeter and software. This is not something you can really do by eye.
A 1D and 3D LUT can further improve the results of your projector. Which projector are you using? Boxes like the Lumagen and the upcoming MadVR Envy will do a great job to calibrate projectors. They also have tone mapping for HDR that is most likely better than what is in the projector. (or most consumer TVs) They may cost as much or more than your projector though.
The 2-point (bias and gain) will allow you to adjust the bottom and top end. Since you are only adjusting two points, it may not be uniform throughout the range. This is where the LUTs make further improvements.