How to open 32-bit PNG alpha unpremultiplied?

I have the last Photoshop CC (2014) and I tried to figure out how to import a PNG file of 32-bit with alpha channel embedded, but unpremultiplied in it.  So this is a PNG image with four channels: red, green, blue and Alpha.  Unfortunately, when I open it in PS, I get a picture of three channels (R, G, B) where PS has premultiplied cheerfully alpha in other channels, as you can see here:

rad3_rgb_021.png

The "glow" is adverse to the Alpha channel.

I know that the Alpha channel is still there because if choose channel-> Split, I get four grayscale images: myimage_red, myimage_green, myimage_blue and myimage_transparency.    So the Alpha information is kept separate, but PS is 'useful' and he premultiplying outdoors.

Y at - it a setting or anything else that can solve this problem?

Note: The reason is that I use the 'alpha' for something else (ambient occlusion) channel in a CG program and it must not be used for transparency at this stage.   (Long story).

Yes, you are badly abusing the word "premultiplied".

There is no premultiplication past here - just says that you have something in the transparency channel which is not transparent and therefore doesn't seem correct when applied as transparent as a PNG, it must be.

Read my previous post about how to extract the transparency channel.

In addition, you must talk to your authors to program CG PNG export to actually conform to the PNG specification.

Tags: Photoshop

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