Colors look wonky and more saturated when exporting

[shotcut]

See this possibly related thread about issues with hardware-accelerated decoding used by most media players but not Shotcut:

White border not really white

Hi, I’m a beginner in shotcut. It’s very intuitive, but I encounter a problem with a white border mask around my videos. So perhaps I use it the wrong way. I have a video, and I add in a second layer the mask (a png file with only white border, the other part of the file is transparent). I join the caption of the configuration and the files. You can see that in the preview area, the border is white, as in the png file. Preview image export joined. But after rendering the video (I use the You…

And @SteeveB is correct about colorspace conversions (RGB in test pattern generator → Y’CbCr in H.264 → decoded → RGB still image capture) may introduce slight differences not to mention using MPEG video levels (16 - 235 for Y’ and 16-240 for CbCr vs. 0-255 for RGB).