PIL question

[Tim Eichholz]

On Apr 6, 3:05 am, Peter Otten <__pete... at web.de> wrote:
> Tim Eichholz wrote:
> > I'm trying to cut a BMP with 80 adjacent frames down to 40 using the
> > Image.copy and .paste functions but I'm getting error "ValueError:
> > images do not match" on the paste line.
> > newimage.paste(cols[f], (f*framew, 0, (f*framew)+192, 192))
>
> The 4-tuple doesn't match the size of the image you are pasting:
>
> >>> from PIL import Image
> >>> image = Image.open("tmp1.png")
> >>> image.size
> (134, 400)
> >>> image.paste(image, (0, 0, 134, 400)) # correct size --> works
> >>> image.paste(image, (0, 0, 134, 300)) # wrong size --> raises exception
>
> Traceback (most recent call last):
>   File "<stdin>", line 1, in <module>
>   File "/usr/lib/python2.6/dist-packages/PIL/Image.py", line 1077, in paste
>     self.im.paste(im, box)
> ValueError: images do not match
>
> You can add
>
> for index, image in enumerate(cols):
>    print "image %d --> %s" % (index, image.size)
>    # image.save("tmp%d.png" % index)
>
> to your code to learn the actual size of your intermediate images.
> After you have fixed the size problem and see that the resulting image
> doesn't meet your expectations (likely, don't despair) you can uncomment the
> image.save(...) statement and have a look at the intermediate images.
>
> A hint about counting loops: instead of
>
> x = 0
> while x < n:
>    ...
>    x = x + 1
>
> it is idiomatic python to write
>
> for x in range(n):
>     ...
>
> and
>
> x = 0
> while x < total_width:
>     # ...
>     x += single_width
>
> is typically expressed as
>
> for x in range(0, total_width, single_width):
>    ...
>
> Have a look at the tutorial for more basic tips.
>
> Peter

I think maybe I am using the wrong function. I want to paste the
entire 192x192 contents of cols[f] into newimage. I would think it
works like newimage.paste(cols[f], (x, 0, 192+x, 192)) if that's not
it I think I'm missing a function