Add webp scripts and makefiles

Add scripts for testing compression quality and converting collections
of pngs to webps.

1 files changed, 20 insertions, 0 deletions

diff --git a/webp/lossless_z_gen_images.sh b/webp/lossless_z_gen_images.sh
new file mode 100755
index 0000000..d6e3789
--- /dev/null
+++ b/webp/lossless_z_gen_images.sh
@@ -0,0 +1,20 @@
+#!/bin/bash
+# SPDX-FileCopyrightText: 2023 Brian Woods
+# SPDX-License-Identifier: GPL-2.0-or-later
+
+OUTDIR=lossless_z_images
+
+IN=" $( ls orig/*.png )"
+
+mkdir -p "$OUTDIR"
+for INFILE in $IN ; do
+	# z range 0 to 9
+	for Z in {0..9} ; do
+		cwebp \
+			-lossless \
+			 -z $Z \
+			-resize 1920 1080 \
+			"$INFILE" \
+			-o "$OUTDIR/$( basename -s .png $INFILE )-z_$Z.webp"
+	done
+done