RedColor3 Highlight Saturation Rolloff

[John Schick]

Hey, I noticed an interesting color artifact when using RedColor3. Basically the highlight saturation is very strong and, in certain cases, causes some of the color channels to clip (even in RedLogFilm with all default settings). When I switch to RedColor2 (since it's more desaturated overall) the clipping is less extreme.

The main solution I've found is to desaturate the raw data (or use RedColor2), and then re-saturate the image further down the pipe.

It's not a huge issue, but I mainly wanted to bring this to RED's attention and maybe there could be an adjustment to the highlight saturation rolloff in the next version of RedColor.


NOTE: Turning on DRX doesn't seem to help in this particular case.


You can download a r3d snapshot here:
https://dl.dropbox.com/u/26939196/r3d/A001_C006_1218A8.0003866F.R3D

 

[Bob Gundu]

What you are witnessing is the dreaded artifacts of those spectrum deficient fluorescent bulbs. They have a terrible green yellow cast thats hard to fix. The dipping of the blue channel is the result of this. In all the Colour spaces and Gamma settings, the spectrum will shift around and some will look like it's gone but it's just crushed. Move the Kelvin slider around and see what happens to the blue channel. Funky!

 

[John Schick]

Yeah, I guess it threw me off a little because it was so extreme that it was actually clipping the blue channel a bit. Brining the raw saturation down to 0.9 helps.