Kiwiellis Posted April 9, 2018 Posted April 9, 2018 What's the best way to change the color of this background to bright yellow? I've been trying to follow the tutorial "extracting subject from green background" because of the hair. I can't seem to get a clean black & white mask - can't seem to get the background to go completely white and her to go black on the levels layer. Is this the best method to use in this instance? If so, do the values on the channel mixer layer need to change based on the particular image. I played around with the sliders to try to get more contrast than the 0/100/0 was giving me. Any direction you can give would be so appreciated. I have a feeling I'm making this way harder than it needs to be.
Damien Symonds Posted April 9, 2018 Posted April 9, 2018 1 minute ago, Kiwiellis said: I've been trying to follow the tutorial "extracting subject from green background" because of the hair. I can't seem to get a clean black & white mask - can't seem to get the background to go completely white and her to go black on the levels layer. Is this the best method to use in this instance? No, that shit is NEVER the best method. Give me a few minutes ...
Damien Symonds Posted April 9, 2018 Posted April 9, 2018 If that's not the right shade of yellow, let me know how it should look.
Damien Symonds Posted April 9, 2018 Posted April 9, 2018 I have to go out to do grocery shopping now. I'll check in when I get back.
Kiwiellis Posted April 10, 2018 Author Posted April 10, 2018 I think it might need to be a little more golden yellow to match the smidge of yellow eye shadow above her right eye. But wow! Ok, so how do I do this? Did you extract her, or just mask her? I've got quite a few other shots from this shoot, and she wants them all with different color backgrounds. Had I known I would've shot on white instead of that awful pink. But can't reshoot now.
Damien Symonds Posted April 10, 2018 Posted April 10, 2018 It's very simple. Just this Channel Mixer layer: Red +100, 0, 0, +10 Green +93, 0, 0, 0 Blue 0, +100, 0, 0 Then mask it on to the background. You'll be SO pleased to see that you don't need any precision at all around her hair - just let your mask blend gently into the edge of her hair. The same with her shirt. The only place you'll need precision masking is around her face. Make sure you zoom in, and use the Shift key. Once you've done it very accurately around the edge, switch to a 10% opacity brush, at a bigger size, and gently mask onto her skin a bit, to remove the pink cast that's on the side of her face. 1
Damien Symonds Posted April 10, 2018 Posted April 10, 2018 Make sure you copy my numbers EXACTLY. If you get even one of them in the wrong position, the colour result will be vastly different.
Kiwiellis Posted April 10, 2018 Author Posted April 10, 2018 Thank you so much! I'll play with this today!
Kiwiellis Posted April 10, 2018 Author Posted April 10, 2018 So how will I know how to set the values for the channel mixer layer for the other background colors she wants? On the next image I'm doing for her, she wants blue.
Damien Symonds Posted April 10, 2018 Posted April 10, 2018 https://www.damiensymonds.net/channel-mixer-class
Damien Symonds Posted April 10, 2018 Posted April 10, 2018 If you need a setup that allows you to change to a large number of different colours, we'd do it differently. The Channel Mixer layer would simply have the "Monochrome" box checked, and +100, 0, 0, 0 as the values. Then you'd add a Solid Color layer on "Multiply" blend mode. That's the layer whose colour you could change to anything you want. Start with blue, and fiddle with it later. The trouble with this method is that the masking needs to be much more precise. The mask can still go into the hair a little bit, but nowhere near as easily.
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