I am very confused with the following situation, let's say we have an image with two colors: (RGB 0,60,60) and (RGB 255,0,0).
I have noticed that the tone curve in Adobe Lightroom works differently than Photoshop. What i have understanded is that photoshop's RGB curve remapps the tone values of each color channel to the new determined by the curve. For instance if we make the following change to the curve:
The left color which was (RGB 0,60,60) now is (RGB 0,0,0) because the value 60 in both green and blue channel has remapped now to 0. The right color (pure red, (RGB 255,0,0)) hasn't change at all, because we have not moved the point of the curve which corresponds to 255.
What makes me confused is that in lightroom when doing the same change in the tone curve, something different happens.
Now the red color(RGB 255,0,0) has turned to black (0,0,0) but i haven't moved the point which corresponds to 255. I also know that Lightroom uses the ProPhotoRGB color space and not sRGB. But in general i don't understand exactly what happens when i change the curves and also why photoshop and Lightroom make different changes. I have find some other similar questions in Photo.Stackexchange but they didn't helped me. Can someone please explain me what happens exactly in depth?
Thanks in advance.