Issues reading JPEG-XR (jxr) images

[Lee H.]

I installed the freetype lib on Ubuntu with

    sudo apt-get install libfreeimage-dev

but I am still having issues getting imageio to read .jxr images in my Python script. 

Doing

    im = imageio.imread('my.jxr')

returns

   ValueError: Could not load bitmap "/tmp/my.jxr": Unsupported format

(The only way I've managed to read these files so far in Ubuntu is with libjxr-tools and then using ImageMagick's `convert in.jxr out.tif` for example)

I thought imageio supports JPEG-XR images though?

[Almar Klein]

It should: http://imageio.readthedocs.org/en/latest/format_jpeg-xr.html

Try doing

im = imageio.imread('my.jxr', format='JPEG-XR')

to force the xr format. Still strange, I would expect the format to have
been picked up automatically. Maybe this is a bug in freeimage.

- Almar

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[Lee H.]

I'm afraid that didn't help.

In the meantime, I installed the master branch of imageio, and installed the latest freeimage from source (3.17). The error changed a little

    ValueError: Could not load bitmap "/tmp/my.jxr": Unsupported format

I attached one of the images I'm playing with...

[Lee H.]

Actually the error the same   (not sure why I read otherwise, but there you go!)

[Lee H.]

Also, I did some temporary debug prints in the src and I can see that 

`self.format.fif` in the Reader defined in freeimage.py is 36, which matches

JPEG-XR: 

('JPEG-XR', 36, 'JPEG XR image format', 'jxr,wdp,hdp')

so format is being picked up correctly it seems, but it has trouble

at `fi.create_bitmap`

[Almar Klein]

Could it be a variant of the format that is not supported by freeimage?

[Lee H.]

Possibly, would you know how to check? All I know so far is the image loads without issue on Windows, and on linux ImageMagick's `convert` can covert it to a tif or JxrDecApp does it (I think ImageMagick's convert might be just delegating to JxrDecApp actually).  

[Almar Klein]

> the image loads without issue on Windows

With imageio?