Selecting only in terms of transparency

[yunudo]

Is there a way/tool to select pixels only in terms of transparency? like, selecting all the pixels that their transparency is at 142,  no matter what their color are?

[Ego Eram Reputo]

Hi there @yunudo. Welcome to the paint.net forum ☺️

 

Go to the Plugin Index (there's a link in my signature)....

 

Type in the Keyword: Transparen (leave the end missing to capture both transparent & transparency)

 

In particular, UnAlpha might be worth a look. If that doesn't work, @BoltBait and @Red ochre have excellent tools for dealing with transparency in their plugin packs.

[BoltBait]

Step 1: install my plugin pack

Step 2: Open your image in Paint.NET. 

Step 3: Duplicate the layer you want to select from 

Step 4: Effects > Object > Switch alpha to gray

Step 5: Use magic wand (tolerance 0, global selection mode) to select the gray pixel of the alpha level you want to select. 
Step 6: Switch back to your original colored layer. 
 

 

[Djisves]

18 hours ago, BoltBait said:

Step 4: Effects > Object > Switch alpha to gray

Brilliant! Thank you for pointing out another use of your plugin.

Perhaps worth pointing this out on the pack topic?

 

EDIT: (for the benefit of anyone who may ask)

To pinpoint the exact pixel to select, you may have to

- either turn the grayscale layer visibility off, but keep it selected/highlighted in the Layers window,

- or move grayscale layer below the original layer, but keep it selected/highlighted in the Layers window.

This way you can see the original layer when clicking with the Magic Wand on exact pixel you want on the grayscale layer.

[BoltBait]

1 hour ago, Djisves said:

To pinpoint the exact pixel to select, you may have to...

 

Thanks for typing that up. When I first responded, I was on my phone and was too lazy to type it up. I was kinda hoping the OP would figure that part out.

[yunudo]

Thanks a lot!