UV Map node generates like lowres image

Support Compositing and Post Processing
1

When I use UVMap node to distort image texture via UV pass image in compositor, mapped image become very pixelated (like lowers) on output. Pixelated is not whole output image only image texture. Did I missed something in setup? Thank you for help.

Screen Shot 2015-01-16 at 16.08.19 copy.jpg724×602 99.2 KB

Check linked example file.

Attachments

test-NODE-UVMap.zip (690 KB)

2

Almost perfect with saving UV pass into OpenEXR format.
(Thanks to gandalf3’s help)

Comparison.png1653×849 141 KB

To see differences open image in new window.

BTW - any tip to fix artifacts on edges?
I tried to disable antialias, but result is the same.