Merge remote-tracking branch 'origin/contrib/17099-trimage' (Closes: #17099)

wiki/src/contribute/how/documentation.mdwn

@@ -78,7 +78,7 @@ To use these tools, please first install the dependencies:
 
   - Images on our website are compressed and cleaned using the
     [[compress-image.sh]] script. To run this script you need the
-    `optipng`, `advancecomp`, and `mat` packages.
+    `trimage` and `mat2` packages.
 
 ## QR codes
 

wiki/src/contribute/how/documentation/compress-image.sh

@@ -3,13 +3,8 @@
 set -e
 set -u
 
-if [ ! -x /usr/bin/optipng ]; then
-    echo "Please install the \"optipng\" package." >&2
-    exit 1
-fi
-
-if [ ! -x /usr/bin/advdef ]; then
-    echo "Please install the \"advancecomp\" package." >&2
+if [ ! -x /usr/bin/trimage ]; then
+    echo "Please install the \"trimage\" package." >&2
     exit 1
 fi
 
@@ -19,8 +14,7 @@ if [ ! -x /usr/bin/mat2 ]; then
 fi
 
 for image in "${@}" ; do
-    optipng -o6 "${image}"
-    advdef -z3 "${image}"
     mat2 "${image}"
-    mv "${image%.*}.cleaned.${image#*.}" "${image}"
+    trimage -f "${image}"
+    mv "${image%.*}.cleaned.${image##*.}" "${image}"
 done