: Layer looks different when exported alone I'm having a little bit of trouble exporting a bunch of semi-transparent layers from a PSD file in Photoshop. If I export the layers alone one by one

@Gail6891361

Both screen and overlay are easy to implement, Wikipedia lists formulas for all of the modes. Screen is:

value = 1-(1-Bottom)(1-Upper)


where Bottom is the per channel value of bottom layer and Upper is the per channel value of Upper layer. All colors are assumed to be in 0-1 range. Overlay is listed as:

value = Bottom*Upper*2 if Bottom < 0.5
value = 1-2*(1-Bottom)(1-Upper) if Bottom >= 0.5


Now this is all easy to implement if you have a environment where you can actually manipulate things like this, such as a game etc. However if you work on a webpage or other scene graph system with no shader access then you end up in a situation where you can not easily dominate the object model to do your bidding without taking a undue amount of the effort to your own name. But that is a question for stackoverflow.

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