From 3a98787bddeb007a1cd2b86235205774c15250f2 Mon Sep 17 00:00:00 2001 From: Søren Sandmann Pedersen Date: Mon, 12 Nov 2012 12:27:39 -0500 Subject: Add demos/zone_plate.png The zone plate image is a useful test case for image scalers because it contains all representable frequencies, so any imperfection in resampling filters will show up as Moire patterns. This version is symmetric around the midpoint of the image, so since rotating it is supposed to be a noop, it can also be used to verify that the resampling filters don't shift the image. V2: Run the file through OptiPNG to cut the size in half, as suggested by Siarhei. --- demos/zone_plate.png | Bin 0 -> 228732 bytes 1 file changed, 0 insertions(+), 0 deletions(-) create mode 100644 demos/zone_plate.png diff --git a/demos/zone_plate.png b/demos/zone_plate.png new file mode 100644 index 0000000..519291d Binary files /dev/null and b/demos/zone_plate.png differ -- cgit v1.2.3