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removing semi transparent pixels(or changing their value)

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I want to remove only semi transparent pixels in a image. I want to keep others without changing them. How can i do that?

And is it possible to increase/decrease of all semi transparent pixels at one time?

For example: When i choose the increasing tranparency-alpha value at 20

if a pixels transparency is 120, it will be 140

if 75, it will be 95

if 255, keep it same

if 0, keep it same

sorry for bad english.

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As a workaround:

1. duplicate your layer (ctrl+shift+d) and use the brightness/contrast adjustment to set the contrast to 0, then use hue/saturation to set saturation to 0 as well.

This should get you a layer where the only difference between pixels is the transparency. This allows you to:

2. use the magic wand (set tolerance to 0%) to select all the totally opaque pixels.

3. Once you have them selected, invert the selection (ctrl+i) and turn off the visibility of the grey layer.

This gives you a selection of all the pixels that are not totally opaque, effectively ignoring them. Now you can adjust your transparency without disturbing the opaque pixels!

No, Paint.NET is not spyware...but, installing it is an IQ test. ~BoltBait

Blend modes are like the filling in your sandwich. It's the filling that can change your experience of the sandwich. ~Ego Eram Reputo

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