Getting rid of colorcast in shadows in photoshop

I have clicked on the curve and selected a point right in the middle. So eventually, (0,0) is black (255,255) is white and (128,128) are the middle greys. In the Y-Axis, the bottom corresponds 0 and you can see it max out at 255 at the top. In the X-Axis, the left most corresponds to black (0) and the right most corresponds to white (255) with all shades of grey inbetween. You have two bars (marked in red), one representing the X-Axis and the other representing the Y-Axis. So the slanting line you see running across the window represents the corresponding luminosity values. For more on it please go through SpencerвЂ™s article on sRGB Vs Adobe RGB Vs ProPhotoRGB. It considers a pixel as a combination of Red, Green & Blue as numerals from 0 to 255. Let us first brush up our memory on how Photoshop defines a pixel. The window has two bars, an inclined line and a histogram embedded inside it. Once you create a curves adjustment layer, you see what is below in the properties tab/window. You can add a Curves adjustment layer either by clicking on the create new fill or adjustments icon in your layers panel or directly clicking on the curves tool if you have the Adjustments tab open. By using curves as an adjustment layer, you are doing the same in a non-destructive way, ie., you can change the values or even delete the entire layer at any point of time without altering the original image. The former method applies the curve directly to the image making it a destructive form of editing ie., you cannot modify it later, unless you have converted it into a smart object. The second and the most effective way is to use curves as an adjustment layer.

One way of doing it is, by going to the menu Image->Adjustments->Curves. There are two ways to use curves in Photoshop. Precise Curve Adjustment with the Hand Pick Tool.

Getting rid of colorcast in shadows in photoshop