On Fri, Nov 5, 2010 at 7:16 AM, loz.accs <loz.a...@gmail.com> wrote:
> [...]
>
> Image object (Image.fromstring) was created successfully, but red and
> blue colors was swapped.
> So my question: is there any way to swap colors in image using PIL?
My naive (and slow) implementation would be something like this (code not
tested):
def swap(image):
width, height = image.size()
res = Image.new("RGBA", (width, height))
data1 = image.load()
data2 = res.load()
for y in range(height):
for x in range(width):
r, g, b, a = data1[x, y]
data2[x, y] = (b, g, r, a)
del image
return res
However, be aware that even if the format is BGRx on your machine doesn't
mean it's the same on a different machine (or even on your machine with a
different resolution), as the screen format will depend on the graphics card and
driver.
Usually the drivers will have a way to tell which format the screen is in (i.e.
RGBx or BGRx), so I advice you to check the format and pass this information on
to the Python code, or convert it to RGBx before handing the image buffer over
to Python.
Anders
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