Removing Colorcast in Photoshop Easily and Accurately
Hey everyone,
I made the below video to demonstrate how to remove color casts in your images. You rarely have time to shoot with a grey card, especially when the light constantly changes, or if it is an action shot. I have been experimenting for a while on how to use Photoshop to simulate a 50% grey card. You can always just take a color sampler tool and click what you think is 50% grey, but that is usually inaccurate. I finally have a pretty painless way, and it's simple to do, and really accurate. See the video below. In the example photo, the plane had a purple color cast on it. I wrote the steps below that I performed. It takes a minute.
1.) Duplicate layer
2.) Go to Edit, and click on Fill, and select 50% grey. Leave blending to normal at 100% opacity.
3.) Change the blending mode from Normal to Difference. The colors will change drastically. The darkest spots on the image are where you have almost perfect 50% grey.
4.) Add a Threshold Layer.
5.) Slide the slider all the way to the left. The screen will turn completely white. Slide to the right until you see specs of black appearing.
6.) Select your Color Sampler Tool.
7.) Zoom in and click on one of the black specs.
8.) Zoom out and add a curves adjustment layer.
9.) Delete the Threshold layer, and the background layer that you filled with grey.
10.) Open the Curves adjustment, and select the second sampler tool from the top. That is the grey sampler.
11.) Click on the target you sampled earlier, and the color cast will go away.
12.) Flatten image, and continue to post process.
https://www.youtube.com/watch?v=P1_YOemRzlc
