Re: [Gimp-print-devel] Printing RGB layers in B&W.

[Keith P. <em...@mt...>]

Thanks guys,

You've cracked it.

Much appreciated,

Keith.

   From: Robert L Krawitz <rl...@al...>

      Date: Wed, 01 Mar 2000 12:28:22 +0000
      From: Dave Hill <da...@mi...>
   
      The problem seems to be that after you have merged the layers
      (which you have to do by hand in Gimp 1.0.4), the image is
      "RGB-Alpha". If you just draw on the background, the image is
      "RGB" and works OK. So the problem is in "rgb_to_gray()" which
      isn't handling the alpha channel properly.
   
   OK, I think I know what's wrong here.  I was dividing by the wrong
   constant.  I believe that this happened initially when I was
   converting everything from 8 to 16 bits of precision.  Around 1.74 I
   "fixed" the constant from 25500 to 255, which was incorrect.  I've
   tested this and committed it to the mainline (at first I thought the
   constant was supposed to be 100, but that definitely didn't work :-)
   
   Mitch or Sven, could you apply this to 3.0 when you get