Add webp scripts and makefiles

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

1 files changed, 21 insertions, 0 deletions

diff --git a/webp/lossy_nearlossless_gen_images.sh b/webp/lossy_nearlossless_gen_images.sh
new file mode 100755
index 0000000..4e65a76
--- /dev/null
+++ b/webp/lossy_nearlossless_gen_images.sh
@@ -0,0 +1,21 @@
+#!/bin/bash
+# SPDX-FileCopyrightText: 2023 Brian Woods
+# SPDX-License-Identifier: GPL-2.0-or-later
+
+OUTDIR=lossy_nearlossless_images
+
+IN=" $( ls orig/*.png )"
+
+mkdir -p "$OUTDIR"
+for INFILE in $IN ; do
+	for Z in {0..10} ; do
+		NUM=$(( Z * 10 ))
+		NUM_STR=$( printf "%03d\n" "$NUM" )
+		cwebp \
+			-mt \
+			-near_lossless $NUM \
+			-resize 1920 1080 \
+			"$INFILE" \
+			-o "$OUTDIR/$( basename -s .png $INFILE )-nl_$NUM_STR.webp"
+	done
+done