Re: convert taking a grayscale image and turning it into RGB

>
> > The pnm is RGB!
>
> PNM supports monochrome, grayscale, and RGB but not colormapped.  To
> force a colormapped image use -type Palette:
>
>  convert mottle.pnm -type Palette ...
>

That does not explain why the behavior changed from the old version to
the new version. Furthermore, I tried using -type several different
ways but the result was always the same as before - the grayscale png
turned into an rgb pnm.

I was quite unhappy with that behavior and set out to explore what was
going on with gdb and promptly found a bug! A break; was missing from
one of the cases in coders/pnm.c which meant that all pnms were
turning into type 6 because the default on the switch would always be
executed. Here's the fix for it:

diff --git a/coders/pnm.c b/coders/pnm.c
index b7caf77..278e857 100644
--- a/coders/pnm.c
+++ b/coders/pnm.c
@@ -1259,6 +1259,7 @@ static MagickBooleanType WritePNMImage(const
ImageInfo *image_info,Image *image)
                   format='1';
               }
           }
+        break;
       }
       default:
       {

I rebuilt the code with that fix and tested. convert did the right thing! YAY!

-- 
Viktor R. Ivanov <[email protected]>

P.S.
I couldnt check the code out of svn. Kept getting:
svn: PROPFIND request failed on '/subversion/ImageMagick/trunk'
svn: PROPFIND of '/subversion/ImageMagick/trunk': 405 Method Not
Allowed (https://www.imagemagick.org)

So.. the patch I created is based off of the 6.4.1 tar off on of the
download mirrors