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How to remove low-alpha pixels in photoshop


Question

Assume that I have a png image of size 32x32(1024 pixels). It consists of x pixels with alpha > 60% and (1024-x) pixel with alpha < 25%. Could you please tell me how to remove all low-alpha( alpha < 25% ) pixel in image?

Is there anything like alpha range - color range in photoshop?

2012/07/24
1
3
7/24/2012 2:49:00 AM

Here's one way to do it:

  1. Extract the alpha channel, so it's a separate mask. Here's a way to separate the alpha.
  2. Edit the alpha channel, using levels or curves.

Does that help? Do you need more detail?

2017/04/13
3
4/13/2017 12:46:00 PM