Re: Image background

saito <saitology9@gmail.com> wrote:

I wonder if it is possible to remove the background from an image and
make it transparent using Tk or a package? Then I can save it as a png
image. The background in my case consists of a single color. Perhaps I
could replace that color with an "alpha" color but how?

man n photo:

   imageName transparency subcommand ?arg arg ...?
      Allows examination and manipulation of the transparency
      information in the photo image.  Several subcommands are
      available:

      imageName transparency get x y
         Returns a boolean indicating if the pixel at (x,y) is
         transparent.

      imageName transparency set x y boolean
         Makes the pixel at (x,y) transparent if boolean is true,
         and makes that pixel opaque otherwise.