Add hack.

diff --git a/hacks/testcard.py b/hacks/testcard.py
new file mode 100644 (file)
index 0000000..eff2012
--- /dev/null
+++ b/hacks/testcard.py
@@ -0,0 +1,38 @@
+#!/usr/bin/python
+
+from PIL import Image
+import numpy
+from libtiff import TIFF
+
+width = 1998
+height = 1080
+filename = 'test.tif'
+
+im = numpy.zeros((height, width, 3), dtype=numpy.uint16)
+
+# Convert 12 to 16-bit
+def pixel(x):
+    return x << 4
+
+# Bars of increasing intensity in X
+for x in range(0, width):
+    for y in range(0, height):
+        if x < 400:
+            im[y][x][0] = pixel(0)
+        elif x < 800:
+            im[y][x][0] = pixel(1024)
+        elif x < 1200:
+            im[y][x][0] = pixel(2048)
+        elif x < 1600:
+            im[y][x][0] = pixel(3072)
+        else:
+            im[y][x][0] = pixel(4095)
+
+# Ramp in Y
+for x in range(0, width):
+    for y in range(0, height):
+        im[y][x][1] = pixel((x * 4) % 4096)
+
+tiff = TIFF.open(filename, mode='w')
+tiff.write_image(im, write_rgb=True)
+tiff.close()