How do I quickly replace all transparent pixels with background color?

Question

Some of my software tools generate images with transparent backgrounds. Using Krita, how can I quickly replace transparency with a background color?

Notes:

• Of course it would be easiest if the image was generated correctly. This is not possible right now.

• With GIMP I used the following workflow, but the equivalent steps don't work in Krita:

  1. Open image

  2. Select "Flatten image" (replaces transparency with default background color)

  3. Save image

Answer 1

I would put a layer below the transparent object with the color I need and flatten it.

The additional steps would be to create the background layer and paint it.

Keep a copy of your original assets.

Answer 2

In Gimp, for a single layer (so without flattening the image)

• Start the bucket-fill tool
• Set to Behind mode
• Set to BG color fill (or use Alt-click in next)
• Bucket fill the whole layer (without using a selection)

This will "fill the holes" exactly as needed (especially the semi-transparent pixels on the edges).