1 files changed, 33 insertions, 0 deletions
diff --git a/test/ppmmix.test b/test/ppmmix.test
new file mode 100755
index 00000000..e1c6486b
--- /dev/null
+++ b/test/ppmmix.test
@@ -0,0 +1,33 @@
+#! /bin/bash
+# This script tests: ppmmix
+# Also requires: pamdepth pamenlarge pamsumm pbmmake
+# Also requires: pgmtopgm pnminvert ppmtopgm
+
+
+tmpdir=${tmpdir:-/tmp}
+
+# Test 1. Print a pretty checkerboard pattern
+a1_pgm=${tmpdir}/a1.pgm
+a2_pgm=${tmpdir}/a2.pgm
+
+pbmmake -g 8 8 | pgmtopgm > ${a1_pgm} &&
+pbmmake -g 2 2 | pamenlarge 4 | pgmtopgm > ${a2_pgm} &&
+ppmmix 0.75 ${a1_pgm} ${a2_pgm} | ppmtopgm | pamdepth 3 -plain &&
+rm ${a1_pgm} ${a2_pgm}
+
+# Mix image with itself.
+# Output should match input regardless of ratio.
+for i in 0 0.5 0.6 1
+do
+ppmmix $i testimg.ppm testimg.ppm | cksum
+done
+
+# Mix image with its own inverse.
+# Output should be a monotone gray sheet.
+a3_ppm=${tmpdir}/a3.ppm
+
+pnminvert testimg.ppm | ppmmix .5 \
+    testimg.ppm - | tee ${a3_ppm} | \
+  pamsumm -brief -max &&
+  pamsumm -brief -min ${a3_ppm} &&
+rm ${a3_ppm}