Mail glitch. I have no idea why this got sent out tonight, I think it's a duplicate of an email I really sent a week or so ago.
> On Feb 16, 2016, at 10:51 AM, Larry Gritz <[email protected]> wrote: > > 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. > >> On Feb 16, 2016, at 8:25 AM, Jep Hill <[email protected] >> <mailto:[email protected]>> wrote: >> >> 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 = oiio.ImageBuf(in_img) >> 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 >> >> >> _______________________________________________ >> Oiio-dev mailing list >> [email protected] <mailto:[email protected]> >> http://lists.openimageio.org/listinfo.cgi/oiio-dev-openimageio.org > > -- > Larry Gritz > [email protected] <mailto:[email protected]> > > > _______________________________________________ > Oiio-dev mailing list > [email protected] > http://lists.openimageio.org/listinfo.cgi/oiio-dev-openimageio.org -- Larry Gritz [email protected]
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