24-bit RGB KEYIMAGE is displayed wrong when output image is 8-bit

[jorn@…]

This only happens when KEYSIZE in not default ("20 10").

Sample map file:

MAP
NAME DEMO
STATUS ON
SIZE 600 600
UNITS METERS
SHAPEPATH "data"
FONTSET "fonts.txt"
EXTENT -72493.34 5453045.5 100000 8922059.5
IMAGECOLOR 255 255 255
IMAGETYPE png

   PROJECTION
     "init=epsg:32633"
   END

   WEB
     HEADER demo_header.html
     TEMPLATE demo.html
     FOOTER demo_footer.html
     IMAGEPATH "/usr/local/apache/htdocs/tmp/"
     IMAGEURL "/tmp/"
   END

   LEGEND
        STATUS EMBED
        POSITION UR
        KEYSIZE 49 139
   END

   LAYER
        NAME "msgSST"
        DATA "SST.tif"
        TYPE RASTER
        STATUS default
        DEBUG ON
        OFFSITE 255 255 255
        PROJECTION
                "proj=stere"
                "lat_0=40"
                "lon_0=0"
        END
        CLASS
                NAME ""
                KEYIMAGE 'data/msgSSTcolor.png'
        END
   END
END

[jorn@…]

The 24-bit keymap

[jorn@…]

The 8-bit keymap