1 files changed, 29 insertions, 0 deletions
diff --git a/test/ppmmix.test b/test/ppmmix.test
new file mode 100755
index 00000000..0f9deedc
--- /dev/null
+++ b/test/ppmmix.test
@@ -0,0 +1,29 @@
+#! /bin/bash
+# This script tests: ppmmix
+# Also requires: pamdepth pamenlarge pamsumm pbmmake
+# Also requires: pgmtopgm pnminvert ppmtopgm
+
+# Print a pretty checkerboard pattern
+${PBM_BINPREFIX}pbmmake -g 8 8 | \
+ ${PBM_BINPREFIX}pgmtopgm > ${tmpdir}/a1.pgm &&
+${PBM_BINPREFIX}pbmmake -g 2 2 | ${PBM_BINPREFIX}pamenlarge 4 | \
+ ${PBM_BINPREFIX}pgmtopgm > ${tmpdir}/a2.pgm &&
+${PBM_TESTPREFIX}ppmmix 0.75 ${tmpdir}/a1.pgm ${tmpdir}/a2.pgm -plain | \
+ ${PBM_BINPREFIX}ppmtopgm | ${PBM_BINPREFIX}pamdepth 3 -plain &&
+rm ${tmpdir}/a1.pgm ${tmpdir}/a2.pgm
+
+# Mix image with itself.
+# Output should match input regardless of ratio. 
+for i in 0 0.5 0.6 1
+do 
+${PBM_TESTPREFIX}ppmmix $i testimg.ppm testimg.ppm | cksum
+done
+
+# Mix image with its own inverse.
+# Output should be a monotone gray sheet.
+${PBM_BINPREFIX}pnminvert testimg.ppm | ${PBM_TESTPREFIX}ppmmix .5 \
+    testimg.ppm - | tee ${tmpdir}/a3.ppm | \
+  ${PBM_BINPREFIX}pamsumm -brief -max &&
+  ${PBM_BINPREFIX}pamsumm -brief -min ${tmpdir}/a3.ppm &&
+
+rm ${tmpdir}/a3.ppm