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I have an image, which have some amount of semi-transparent pixels. I would like to blend them with white:

Source

enter image description here

Wanted

enter image description here

How do I do it?

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I don't think you need to technically blend them with white; you want to change the opacity to 100% , which is what your second image looks like. Put the art (lavender and black) on a separate layer from your background (if yo want to maintain a transparent backround) and change the transparency slider to 100%

  • That's a tricky one: layer itself is 100% not transparent, but it contains pixels with different opacity (RGBA). – Denis Kulagin Sep 30 '16 at 20:04
  • @Denis Kulagin: Check your paint brush is set to full opacity, and the flow also, and brush mode set to normal. – Billy Kerr Mar 29 '17 at 23:33
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There’s a few ways to solve this, but no matter which approach you take, you’re going to have to re-work or trace the edge.

Option 1: Paint underneath

One simple, but slow way to do this, is to paint underneath with white. You can do this with a shape layer, or a bitmap layer. If the stroke is opaque and wide enough, this will likely be the easiest way to go.

Option 2: Duplicate the layer

Another option is to open the image, and make lots of copies of the layer.

  1. Duplicate the layer the image is on, using ⌘J.
  2. Do this a few times… ⌘J, ⌘J, ⌘J, ⌘J, ⌘J.
  3. Select all the layers and merge them.
  4. Duplicate the newly merged layer a few times.
  5. Repeat steps 3 and 4 until all the transparency is gone.

This will give you the the result you’re after with one major flaw: The partially transparent edges will now be aliased (jagged). You’ll have to use a different technique for fixing the edges.

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It's a bit hard to give you a straight answer on that. But through the images you've posted you already answered it.
I would:
1 create a new layer bellow the art one
2 create a lasso selection along the black line of colored area
3 fill with white.
Then I would CTRL+E or Cmd+E both layers.

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