I am currently going through the python API updating it to
match the C++ apis more closely and then writing a more pythonic
wrapper around the c++ api and the commands in oiitool. I have bug
fixes that I will push back as soon as I organize the CCLA.
-bd
On Mon, Apr 16, 2012 at 5:55 AM, Larry Gritz <l...@larrygritz.com> wrote:
> Just glancing at your Python script, it looks like you are reading the image,
> doctoring the spec to have the resolution you want, then writing the same
> image out with the new spec. I'm afraid that is not going to resize it.
> When you output an image, the spec you pass just tells OIIO the dimensions of
> the buffer, it doesn't force a resize. What you need to do is read the image
> in, *do the math and produce a new array of pixels you want at the new size*,
> then write that new buffer using the new spec whose resolution matches the
> buffer. I hope that description makes some sense.
>
> How badly do you need to do this in Python? If you just want a fast path to
> resizing images and converting to JPEG, try using the 'oiiotool' utility from
> the command line. You'd want something like:
>
> oiiotool oldfile.exr --resize 320x240 -o newfile.jpg
>
> As an aside, it's easy for me to believe that the Python bindings either have
> bugs, or have drifted a bit from the C++ implementation lately. It surely
> needs some love that it hasn't had for a while. That may have nothing to do
> with the problem you are having, if I understand correctly. But I bring it
> up because if you are really intent on doing the resize in Python, we
> probably need to do some work to expose the ImageBufAlgo::resize in Python,
> and possibly patch up a couple other things along the way.
>
> -- lg
>
>
>
> On Apr 15, 2012, at 12:48 PM, lorenzo angeli wrote:
>
>> Hi all, I hope this is the right place where to ask.
>>
>> I've started looking in the python api oiio, and so far so good (with a bit
>> of help from the sources) ,
>> on retrieving the metadata from the images .
>>
>> I'm trying now to resize some images and converting them to jpgs
>> ('thumbnails')
>> All Jpgs images are resized correctly but not the others types (exr, dpx,
>> etc..).
>>
>> I've got a look at the resize of oiioutils , but I haven't managed to
>> replicat it.
>> Any help is appreciated :)
>>
>> Cheers.
>> L.
>>
>> # ---- CODE ----
>>
>> import os
>> from glob import glob
>> from pprint import pformat
>> import array
>>
>> import OpenImageIO as oiio
>> plugin_path = "~/software/oiio/lib"
>>
>> def thumbnail(image_path, output_path='/tmp):
>>
>> filename = os.path.basename(image_path).split('.')[0]
>>
>> spec = oiio.ImageSpec()
>> imagein = oiio.ImageInput.create(image_path,plugin_path)
>>
>> if not imagein:
>> return
>>
>> # Open the image and read it
>> imagein.open(image_path, spec)
>> imageb = spec.image_bytes(True)
>>
>> arr = array.array("B", "\0" * imageb)
>>
>> imagein.read_image(spec.format, arr)
>> imagein.close()
>>
>> # create new spec for the thumbnail
>> newspec = oiio.ImageSpec(spec)
>>
>> # cleanup the metadata
>> newspec.extra_attribs.clear()
>>
>> # -> resize of the image
>> newspec.width = 320
>> newspec.height = 240
>> newspec.full_x = newspec.x;
>> newspec.full_y = newspec.y;
>> newspec.full_width = newspec.width;
>> newspec.full_height = newspec.height;
>>
>> output_file = os.path.join(output_path,'{0}.jpg'.format(filename))
>> imageout = oiio.ImageOutput.create(output_file,plugin_path)
>> imageout.open(output_file,newspec,oiio.ImageOutputOpenMode.Create)
>>
>> thumbnail = imageout.write_image(newspec.format, arr)
>>
>> # If succesful returns the thumbnail path
>> if thumbnail:
>> return output_file
>> else:
>> return None
>>
>>
>>
>> paths = glob("~/src/oiio-images/*")
>> for path in paths:
>> thumb = thumbnail(path)
>> if thumb:
>> print thumb
>>
>> _______________________________________________
>> Oiio-dev mailing list
>> Oiio-dev@lists.openimageio.org
>> http://lists.openimageio.org/listinfo.cgi/oiio-dev-openimageio.org
>
> --
> Larry Gritz
> l...@larrygritz.com
>
>
> _______________________________________________
> Oiio-dev mailing list
> Oiio-dev@lists.openimageio.org
> http://lists.openimageio.org/listinfo.cgi/oiio-dev-openimageio.org
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