I create a temp image to modify the alpha channel on. Something like
this for adding an opaque alpha channel.
img = bpy.data.images.new("Temp",
image.size[0],
image.size[1],
alpha=True)
pixels = list(image.pixels)
pixels[3::4] = [1.0 for i in range(len(pixels)/4)]
img.pixels = pixels
# set img.filepath_raw & img.file_format before save
img.save()
bpy.data.images.remove(img)
On 05/09/2013 03:18 AM, patrick boelens wrote:
> Hi Campbell,
>
> Thanks for your reply. I already managed to use ImageMagick to add an alpha
> channel as a work-around, but will try your solution on a future batch,
> thanks!
>
> -Patrick
>
>> Date: Thu, 9 May 2013 11:10:26 +1000
>> From: [email protected]
>> To: [email protected]
>> Subject: Re: [Bf-committers] Adding an alpha channel though Python's
>> image.save()
>>
>> This is a limit in the API, and saving at different bit-depths should
>> be possible,
>> for a quick workaround you could set scene render settings and use
>> Image.save_render method (which is intended for render-engine
>> integration but I think it would work in your case).
>>
>> On Thu, May 9, 2013 at 6:06 AM, patrick boelens <[email protected]> wrote:
>>> Hi everyone,
>>>
>>> I've run into a bit of a problem here. I want to use Blender for some batch
>>> image-processing but found a bug in saving. If the image loaded in does not
>>> have an alpha channel, calling image.save() on it will not add one, even if
>>> it does show up correctly in the UV/Image Editor. Saving the image manually
>>> from the Editor it works, but that kind of defeats the purpose of the batch
>>> processing. ;)
>>>
>>> Image.save seems to call IMB_saveiff(), while the menu entry seems to call
>>> IMAGE_OT_save(). It's a bit too deep in for me to figure out though, any
>>> help on getting this to work would be very much appreciated.
>>>
>>> Thanks!
>>> -Patrick
>>>
>>> _______________________________________________
>>> Bf-committers mailing list
>>> [email protected]
>>> http://lists.blender.org/mailman/listinfo/bf-committers
>>
>>
>> --
>> - Campbell
>> _______________________________________________
>> Bf-committers mailing list
>> [email protected]
>> http://lists.blender.org/mailman/listinfo/bf-committers
>
> _______________________________________________
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