I've got some PNG images with transparency, and I need to create versions with the image layer composed onto a white background. I've tried various things with Image Magick "convert" operations, but either nothing happens at all or I get an error. I don't want to go to an intermediate JPG form because I don't want the artifacts. Of course it's easy to do this in Gimp or Photoshop or whatever, but I'd really rather script it from the command line because there are many of these things.
An example of a non-working Image Magick command is:
convert img1.png -background white -flatten img1-white.png
That results in an error.
Thanks!
-background white -alpha remove -alpha off
Example:
convert image.png -background white -alpha remove -alpha off white.png
Feel free to replace white
with any other color you want. Imagemagick documentation says this about the -alpha remove
operation:
This operation is simple and fast, and does the job without needing any extra memory use, or other side effects that may be associated with alternative transparency removal techniques. It is thus the preferred way of removing image transparency.