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[Juho Vepsäläinen <bebraw@xxxxxxxxx>]

I noticed that the watermark image mode is set to "P" (point? is there
PIL doc for modes?). As a result the alpha channel produced was totally
wrong (squeezed horizontally). I managed to bypass/fix the issue with
following hack:

def reduce_opacity(im, opacity):
    ...

    if opacity < 0 or opacity > 1:
        return im

    if im.mode == 'P':
        im = im.convert('RGBA')

    alpha = get_alpha(im)
    alpha = ImageEnhance.Brightness(alpha).enhance(opacity)
    put_alpha(im, alpha)
    return im

As the algorithm works just fine with RGBA it seemed most
straightforward to handle the conversion in this stage.

-- 
Watermark action -- Opacity Value Ignored
https://bugs.launchpad.net/bugs/487435
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Status in Phatch = Photo & Batch!: Confirmed

Bug description:
On version 0.2.4-1 using the Watermark action, the opacity value is ignored.
No matter what value is entered from 0 - 100, opacity doesn't change.