Python Programming Language :: Add images together


	Add images together 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' 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 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. iceman a crit : > 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. 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 a)Yes, I am using PIL. b)The color of each pixel over a sequence of frames 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 On Feb 26, 10:16 pm, "iceman" <savva@gmail.com> wrote: > 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 On 26 Feb 2007 12:30:36 -0800, "iceman" <savva@gmail.com> declaimed the following in comp.lang.python: > 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. I presume said foreground object is the same in all images, no motion, etc. Sounds more like a task suited to edge detection and masking. In any case, you will probably have to code a loop over the (x, y) pixel range, and perform the operations on the associated pixels from each image... Or convert the pixel data to a numpy array -- there may be some array-wide math operations... -- Wulfraed Dennis Lee Bieber KD6MOG wlfr@ix.netcom.com wulfr@bestiaria.com HTTP://wlfraed.home.netcom.com/ (Bestiaria Support Staff: web-a@bestiaria.com) HTTP://www.bestiaria.com/