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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 (by hiding all other layers) and compose them in my app they look different, e.g. they seem to have less transparency or more white color in them.

I've been googling about this issue for a while now and so far I only know that is has something to do with layer blending.

Is there a way to export the layers so that they will look the same when I bring them all together?

Edit:

Here are some screenshots:

Design in photoshop:

Photoshop design

Inside the app (after exporting and combining same layers):

App

  • Show screenshots for clarity, please – Ryanthehouse Sep 24 '16 at 13:14
  • If you're using blending modes the answer is no, but we need more specifics (preferably some screenshots with layers and what blending modes if any etc.) – Cai Sep 24 '16 at 22:50
  • @Ryanthehouse I've added some screenshots, please take a look. – iosdude Sep 25 '16 at 9:10
  • I read some more on blend modes in photoshop and by now I'm pretty sure it's what causing this. I guess now I need to figure out how to make it happen in code... It would be easy to do if the images were static but there are lots of animations going on, this are showing up and going away. I wish the designer didn't use this stuff :) – iosdude Sep 25 '16 at 9:13
  • @Cai These layers use blending modes 100% I checked it in the Layers panel. Some use Screen, others Overlay. – iosdude Sep 25 '16 at 9:16
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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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