Saving plot as Raw RGBA format generates an image-less file (Trac #447)

[smk78]

Saving a plot as Raw RGBA format generates a file but the file does not appear to contain any image! See attached.

Migrated from http://trac.sasview.org/ticket/447

{
    "status": "closed",
    "changetime": "2016-10-07T00:11:17",
    "_ts": "2016-10-07 00:11:17.602351+00:00",
    "description": "Saving a plot as Raw RGBA format generates a file but the file does not appear to contain any image! See attached.",
    "reporter": "smk78",
    "cc": "",
    "resolution": "fixed",
    "workpackage": "SasView Bug Fixing",
    "time": "2015-07-07T10:48:48",
    "component": "SasView",
    "summary": "Saving plot as Raw RGBA format generates an image-less file",
    "priority": "critical",
    "keywords": "",
    "milestone": "SasView 4.0.0",
    "owner": "smk78",
    "type": "defect"
}

[smk78]

Trac update at 2015/07/07 10:49:18:

• smk78 changed attachment from "" to "image.raw"
• smk78 commented:

Raw RGBA format file

[sasview-bot]

Trac update at 2016/08/15 09:14:39: lewis changed _comment0 from:

Also raises an exception:

{{{
Matplotlib backend_wx error: 'unicode' object has no attribute 'close'
}}}

to:

1471259854718583

[sasview-bot]

Trac update at 2016/08/15 11:25:02: lewis changed attachment from "" to "image.rgba"

[sasview-bot]

Trac update at 2016/08/15 11:25:17: lewis changed attachment from "" to "export.png"

[sasview-bot]

Trac update at 2016/08/15 11:27:05:

• lewis changed _comment0 from:

Both SasView 3.1.2 and the current Jenkins build produce the correct image file, just with the wrong extension (.raw instead of .rgba)

The attached image.rgba file is an example output. This can be converted to .png file using ImageMagick:

{{{
magick convert -size 935x635 -depth 8 image.rgba export.png
}}}

Which produces the attached export.png image

to:

1471260441835001

• lewis commented:

Both !SasView 3.1.2 and the current Jenkins build produce the correct image file, just with the wrong extension (.raw instead of .rgba)

The attached image.rgba file is an example output. This can be converted to .png file using !ImageMagick:

magick convert -size 935x635 -depth 8 image.rgba export.png

Which produces the attached export.png image

[sasview-bot]

Trac update at 2016/08/16 14:25:04:

• lewis commented:

Raw rgba formats are useless unless the user knows the dimensions and pixel depth of the image. These need to be added to the documentation somewhere:

Dimensions: 935x635 pixels
Pixel Depth: 8

• lewis changed owner from "" to "smk78"
• lewis changed status from "new" to "assigned"

[pkienzle]

Trac update at 2016/08/16 15:04:46: pkienzle commented:

could remove rgb and rgba formats using:

    from matplotlib import backend_bases
    backend_bases._default_filetypes.pop('raw', None)
    backend_bases._default_filetypes.pop('rgba', None)

probably in sasview.py