Remove all ancillary chunks except for tRNS

build/sanitize-png-files.sh

Index: build/sanitize-png-files.sh
diff --git a/build/sanitize-png-files.sh b/build/sanitize-png-files.sh
index 62faf6bd6a080273ba3679a582853376d64ea3a2..91826b5a2a3bca4ceac62e165622d0100cbc204f 100755
--- a/build/sanitize-png-files.sh
+++ b/build/sanitize-png-files.sh
@@ -20,7 +20,9 @@ function sanitize_file {
   local file=$1
   local name=$(basename $file)
   pngcrush -d $TMP_DIR -brute -reduce -rem text -rem mkBT \
-      -rem mkTS $file > /dev/null
+      -rem mkTS -rem iTXt -rem tEXt -rem zTXt -rem tIME \

[Nico, 2013/01/12 02:59:24]

Looking through the pngcrush souce, it looks like "-rem alla" will remove all
auxiliary chunks, including text and gamma. Should we just use that instead of
this list?

+      $file > /dev/null
+
   mv "$TMP_DIR/$name" "$file"
 }