By the way, I apologize for the fact that resize() doesn't do this for you automatically. In retrospect, it seems like there's some missing logic that would be useful for people. I'll add it for future releases.
> On Jun 19, 2018, at 10:09 AM, Larry Gritz <[email protected]> wrote: > > For simplicity, let's assume that the image origin is (0,0) (i.e., it's not a > "crop" or "overscan" image). We can think about images that are wider than > they are long ("landscape"), or longer than wide ("portrait"). > > I think you want something like the following, which uses the goal width for > landscape and the goal height for portrait, and recomputes the proper size in > the other direction: > > goal_width = ... > goal_height = ... > > buf = oiio.ImageBuf(file) > spec = buf.spec() > w = spec.width > h = spec.height > aspect = float(w) / float(h) > if aspect >= 1.0 : > # source image is landscape (or square) > resize_factor = float(goal_width) / w > goal_height = int(goal_height * resize_factor) > else : > # source image is portrait > resize_factor = float(goal_height) / h > goal_width = int(goal_width * resize_factor) > > resized = oiio.ImageBuf(oiio.ImageSpec (goal_width, goal_height, > spec.nchannels, spec.format)) > oiio.ImageBufAlgo.resize(resized, buf) > resized.write(output) > > That's off the top of my head, you should test it and adjust if I've made > mistakes. But that's the gist. > > Aside: note that when I create the resized buf, I used the number of channels > and data format of the original file, which is a bit more robust than > hard-coding it to 3 chans float as you did in the original. > > > >> On Jun 19, 2018, at 5:28 AM, John Martini <[email protected] >> <mailto:[email protected]>> wrote: >> >> Using python and OpenImageIO how can I resize an image given the maximum >> width and height for the output? >> >> https://stackoverflow.com/questions/50914650/resize-image-using-python-openimageio-maintain-aspect-ratio >> >> <https://stackoverflow.com/questions/50914650/resize-image-using-python-openimageio-maintain-aspect-ratio> >> >> I've been messing around with this for a few days now and i'm still >> completely without a solution. >> _______________________________________________ >> 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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