Add images together

[iceman]

Hi,

I am trying to add together a number of images:

im = image1 + image2 + ...

How can i do this? I have tried to add two image instances
together but i get the following error:
TypeError: unsupported operand type(s) for +: 'instance' and
'instance'

[Diez B. Roggisch]

Re: Add images together

iceman schrieb:

Hi,
>
I am trying to add together a number of images:
>
im = image1 + image2 + ...
>
How can i do this? I have tried to add two image instances
together but i get the following error:
TypeError: unsupported operand type(s) for +: 'instance' and
'instance'

Create a new image of double size, and blit the images to the correct
destination.

Diez

[iceman]

Re: Add images together

What i am trying to do is to separate the foreground object
from the background.All my images contain a foreground object
(i don't have a reference image). What i am trying to do
is to calculate a color-over-time-function for each pixel.

[Bruno Desthuilliers]

Re: Add images together

iceman a écrit :

Hi,
>
I am trying to add together a number of images:
>
im = image1 + image2 + ...
>
How can i do this?
>
I have tried to add two image instances
together but i get the following error:
TypeError: unsupported operand type(s) for +: 'instance' and
'instance'
>

1/ Python has no builtin "image" type.

2/ I don't know any unambiguous mathematical definition of "image addition"

3/ Whatever "image" object you are using, it comes from a package.
Please read the package documentation.

[bearophileHUGS@lycos.com]

Re: Add images together

iceman:

What i am trying to do
is to calculate a color-over-time-function for each pixel.

Are you using PIL?
What does it means color-over-time-function?

Bye,
bearophile

[iceman]

Re: Add images together

a)Yes, I am using PIL.
b)The color of each pixel over a sequence of frames

[zefciu]

Re: Add images together

iceman wrote:

a)Yes, I am using PIL.
b)The color of each pixel over a sequence of frames
>

If you want to add numerical values of each pixel's colour then itereate
through the pixels using nested for loops. But I (and I thing the rest
of people here) can't be sure, what in fact you are trying to do.
Please provide us with further info - what are you working at?

zefciu

[bearophileHUGS@lycos.com]

Re: Add images together

On Feb 26, 10:16 pm, "iceman" <savva...@gmail .comwrote:

a)Yes, I am using PIL.
b)The color of each pixel over a sequence of frames

I think PIL has it for 2 images, you may have to build a binary tree
of merged images:

http://www.pythonware.com/library/pil/handbook/image.htm#blend

Bye,
bearophile