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If you plan to remove your subject from a colored background, you'll inevitably have to deal with color cast from the background. Here we can see a reflective piece of jewelery shot on a red background. If I turn on a white background to show the initial clipped image, you can see a definite remnant of the red background. However, using an adjustment layer like black and white or hue saturation, you can lessen or completely remove the color cast. In the Working Exercise file you'll see a layer called Finish, where you can see the final results. And this is achieved using a black and white adjustment layer.
The process was using the black and white adjustment layer up above, in my adjustments panel, to add a black and white adjustment. The reason that I like using this with color cast is I can specifically target a colored background using the sliders in the black and white adjustments, in this case, red. As I adjust my slider, if I go to the right, I'll lighten the adjustment. You can see it kind of blows out the red. If I go too far to the left, you'll see a definite outline showing up of the red outline. What I want to try and do is match the tonal value of the jewelry as close as possible by adjusting this red slider.
And when I achieve that, one of the benefits, again, working non-destructively, is I have a layer mask. Now, if I did not click the jewelry, what I can do is just manually go in and erase out the areas that I need to blend in. But in this case, I do have a layer mask from my other layer. All I have to do is duplicate the layer mask by holding down Alt or Option, and dragging up to my adjustment layer for black and white. When I release, it asks if I want to replace the layer mask. I'll say Yes and there I have the adjusted image.
Now, I can't leave it like this, because obviously I'm missing a lot of color from the rest of the jewellery. I have a nice jewel down below and I have some gold embellishment going on down here. What I am going to do is I am going to go back to my black and white adjustment in using my Wacom stylus, I'm going to take a lower opacity setting. And erase out the areas to blend in the jewelry color, evaluating as I go along where that color needs to be. If I go too far out into the red and I start to see red showing up in a reflection, all I have to do is click the flip or the X key to flip back between black and white And blend it back out.
After I'm completed, this is the final result. I have a nice blend of the jewelry going on here, and I don't have any red color cast going along the rest of my jewelry piece.
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