examples: Add PNGs for NIST example prints

These PNGs were generated using gimp simply by using the greyscale image itself as an alpha mask. The reason to do this is solely for easier consumption together with cairo A8 surfaces.
2019-06-13 15:53:26 +02:00 · 2019-06-13 15:53:26 +02:00 · 9b175a7681
commit 9b175a7681
parent d67a801f1f
5 changed files with 2 additions and 0 deletions
--- a/examples/prints/README
+++ b/examples/prints/README
@ -1 +1,3 @@
 These are example images from NIST and are in the public domain.
+
+The PNG files have been generated by using the greyscale data as a mask.
--- a/examples/prints/arch.png
+++ b/examples/prints/arch.png
--- a/examples/prints/loop-right.png
+++ b/examples/prints/loop-right.png
--- a/examples/prints/tented_arch.png
+++ b/examples/prints/tented_arch.png
--- a/examples/prints/whorl.png
+++ b/examples/prints/whorl.png