I've got a PSD of a shirt mockup that has several effect layers for highlights and shadows, and then layers for shirt colors.
What I'm trying to do is use this in a web based editor where I can programatically set the background color without having to load a separate image per color - the base PNG would be an overlay allowing the color to show through.
I need to save the mockup to a transparent PNG with no shirt colors - just the highlights and shadows.
However, when I do save as a PNG or save for web as PNG with none of the shirt color layers visible, the resulting PNG doesn't maintain the transparency.
Here's the sample file: https://www.dropbox.com/s/f1j5bj4nk48l9l0/tee-mockup.psd
The shading group is set to passthrough, and the layers in it are set to color dodge, screen, color burn and multiply.
I can't for the life of me how to save this as a PNG with transparencies/layer effects intact. I know this is possible because many online editors are using mockups just like this. Is there a specific method for doing this? Any help is greatly appreciated. Thanks!