OpenCV 4 with Python Blueprints - Second Edition

Designing the warming and cooling effect

With the mechanism to quickly apply a generic curve filter to any image channel in place, we can now turn to the question of how to manipulate the perceived color temperature of an image. Again, the final code will have its own function in the tools module.

If you have a minute to spare, I advise you to play around with the different curve settings for a while. You can choose any number of anchor points and apply the curve filter to any image channel you can think of (red, green, blue, hue, saturation, brightness, lightness, and so on). You could even combine multiple channels, or decrease one and shift another to the desired region. What will the result look like?

However, if the number of possibilities ...