I've inherited some old code that uses the ImageMagick "convert" image1.ps to image2.gif using (within IDL):

spawn, 'export DYLD_LIBRARY_PATH="$MAGICK_HOME/lib"; convert '+ filename + ' ' + gifile

I am able to easily display the converted GIF image, but read_gif.pro continuously issues the error message
"% READ_GIF: Unknown GIF keyword "0x63" in filename.gif"


the query_image.pro produces:

** Structure <af066e8>, 7 tags, length=48, data length=40, refs=1:

CHANNELS LONG 1

DIMENSIONS LONG Array[2]

HAS_PALETTE INT 1

NUM_IMAGES LONG 1

IMAGE_INDEX LONG 0

PIXEL_TYPE INT 1

TYPE STRING 'GIF'


I am using version of ImageMagick (v7).

I've tried an earlier version of ImageMagick (v6.38) with the same results.

The runtime environment is Mac OS x (Mojave 10.14.2), running IDL v8.7.1. I have tried it on OS X 10.9.5 and IDL v8.1 as well.


I have seen 2 days trying to address this problem. Any suggestions?