I'm not very competent in Color Management. I think that every monitor should be calibrated, that is to have a personalized ICC. In this way the monitor reproduces the colors of the edit in the Timeline "quite" correctly. Is the ICC you use specific to your monitor? Then use it. Otherwise use the generic sRGB. Cinelerra GG has no real color management, so what we can aim for is to be satisfied with the result on our screen and hope it doesn't change too much on other monitors. Another tip is to specify, when rendering, the color parameters in the relevant wrench options window. These parameters are: colorspace= ... (color matrix) color_trc= … (transfer characteristic or gamma) color_primaries= … (gamut) They can take the values, for example, bt601, bt709 and bt2020. However, you have to understand that these parameters are only added metadata and do not affect the render. Their importance comes out when we open the file in a video player or browser, etc. Finally the suggestions of a colourist in an old message: https://lists.cinelerra-cv.org/pipermail/cinelerra/2018q4/009903.html Basically: examine the type of signal that your input media have and adjust the project in CinGG in accordance. If you use yuv media then set the project to YUVA 8 bit, etc. The rendering, then, you can set it as you like.