| I think you have the matrix laid out wrong. Instead of
oiio.ImageBufAlgo.warp(xform, src, (1, 0, x_offset, 0, 1, y_offset, 0, 0, 1))
you want
oiio.ImageBufAlgo.warp(xform, src, (1, 0, 0, 0, 1, 0, x_offset, y_offset, 1))
Apologies if I steered you wrong on this.
Thanks Larry.
The integer based transform worked like a charm.
The warp, however, wasn’t working as expected. I tried it in both OIIO 1.6.4dev and 1.6.10. Basically, when I enter any value other than “0� (zero) as a transform value in the matrix, I get a very dark (if not negative) image. I’ve included an example snippet:
# oiio write func from docs def write_image(image_buffer, filename, format=oiio.UNKNOWN): if not image_buffer.has_error: image_buffer.set_write_format(format) image_buffer.write(filename) if image_buffer.has_error: print "Error writing %s : %s" % (filename, image_buffer.geterror())
# warp test def warp_test(in_img, out_img, x_offset=0, y_offset=0): ''' Simple warp function to test x and y transforms. ''' src = ""> xform = oiio.ImageBuf() oiio.ImageBufAlgo.warp(xform, src, (1, 0, x_offset, 0, 1, y_offset, 0, 0, 1)) write_image(xform, out_img)
Is anyone able to get a simple sub-pixel x/y transform working using oiio.ImageBufAlgo.warp?
Cheers, Jep
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