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Add GraphicMagick compatibility

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GraphicMagick branched off ImageMagick's version 5.5.2 in 2002 after
irreconcilable differences emerged in the developers' group.[1]

Some systems might have GraphicMagick and diff-image works just fine with
it, so add a few lines to automatically support it as well, but expect
users to install the compatibility package that adds the symlinks for
commands 'compare' and 'montage'.

[1] https://en.wikipedia.org/wiki/GraphicsMagick

Closes: #37
This commit is contained in:
Otto Kekäläinen
2023-09-04 16:15:11 -07:00
parent ce4cf2ed12
commit 1c26c42f71
2 changed files with 26 additions and 4 deletions
Download Patch File Download Diff File Expand all files Collapse all files

12
README.md
View File

@ -38,8 +38,9 @@ $ diff-image anImageThatHasChanged1.jpg anImageThatHasChanged2.jpg
Installation
------------
1. Install exiftool and ImageMagick. (The script will cope with these missing,
but it's not going to be very exciting without them).
1. Install exiftool and ImageMagick or ImageMagick with the compatibility links.
(The script will cope with these missing, but it's not going to be very exciting
without them).
macOS:
@ -57,7 +58,12 @@ but it's not going to be very exciting without them).
```bash
sudo apt install exiftool imagemagick xdg-open
```
Debian / Ubuntu (if using GraphicsMagick):
```bash
sudo apt install exiftool graphicsmagick graphicsmagick-imagemagick-compat xdg-utils
```
Arch Linux:
```bash

18
diff-image
View File

@ -161,7 +161,16 @@ if \
! which compare > /dev/null || \
! which montage > /dev/null
then
echo 'ImageMagick is not installed.' >&2
if which gm > /dev/null
then
echo 'GraphicsMagick is installed, but graphicsmagick-imagemagick-compat missing.' >&2
echo 'Alternatively the minimum required compatibility links can be installed' >&2
echo 'by running:' >&2
echo ' sudo ln -s gm /usr/bin/compare' >&2
echo ' sudo ln -s gm /usr/bin/montage' >&2
else
echo 'ImageMagick or GraphicsMagick is not installed.' >&2
fi
exit 1
fi
@ -199,8 +208,15 @@ fi
density_flag=
do_compare()
{
if which gm > /dev/null
then
echo "NOTICE: GraphicsMagick does not support 'compare -fuzz', so omitting it"
compare $density_flag $color_flag $backgroundcolor_flag -file png:- "$f1" "$f2" | \
montage $density_flag -geometry +4+4 $backgroundcolor_flag "$f1" - "$f2" png:- >"$destfile" 2>/dev/null || true
else
compare $density_flag $color_flag $fuzz_flag $backgroundcolor_flag "$f1" "$f2" png:- | \
montage $density_flag -geometry +4+4 $backgroundcolor_flag "$f1" - "$f2" png:- >"$destfile" 2>/dev/null || true
fi
}
if which xdg-open > /dev/null