I have a transparent PNG. Its transparency is defined by an alpha channel.

enter image description here

I am used to extracting this in PhotoPaint with a "Create selection from object" and this makes an exact match of the original transparency.

enter image description here

Is there a quick way to recover this transparency information into a selection or a channel in Photoshop?

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In Photoshop hold down CTRL(Mac Command) and click the image layer in the layers palette. That will load the alpha channel as a selection.

enter image description here

If you want to, after making the selection, you can also open the Channels palette and you click the "save selection as Channel" button.

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  • Oh. Thanks. I guess now I will be Ctrl+Clicking, Alt+Clicking every corner I have not already clicked. – Rafael Aug 29 '17 at 11:06

You can simply select with the magic wand the transparent area. This method takes only the full transparent area + what is needed for anti-aliasing if it's ON.

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  • I tested this on a more complex transparency, but I do not think it works. Can you test it please? i.stack.imgur.com/EaAUo.png – Rafael Aug 29 '17 at 10:57
  • @Rafael ok, it does not make feathered selection of partial transparency., I correct the answer. – user287001 Aug 29 '17 at 14:06

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