On 11/24/2012 06:14 AM, Alasdair McAndrew wrote: > I can resize a 2d image "im" with a command something like: > > r,c = shape(im) > im2 = resize(im,(r//2,c//2))
You're missing at least one import there. So how about you start by telling us what non-standard libraries you're using, what version of python you're using, and what OS ? Then supply us a working set of code, in the sense that people can see the problem you're complaining about. > However, resize doesn't seem to work with an RGB image: > > r,c,n = shape(im) # returns, say 500 600 3 Doesn't work is pretty vague. It could mean anything from "it makes the image too small by 1%" to "it crashes my system after reformatting my hard disk." If you get an error, include the entire traceback here. If it doesn't work in some other sense, > I then need to take each band separately, resize it, and put them all back > together with dstack: > > imr = im[:,:,0] > img = im[:,:,1] > imb = im[:,:,2] > imr2 = resize(imr,(r//2,c//2)) > img2 = resize(img,(r//2,c//2)) > imb2 = resize(imb,(r//2,c//2)) > im2 = dstack((imr2,img2,imb2)) > > This works fine, but seems a little clumsy. Of course this could be done in > one command: > > im2 = dstack([resize(im[:,:,i],(r//2,c//2)) for i in range(3)]) > > What I want to know is: is there a version of resize which can be applied > directly to multi-band images, without having to apply to each band > separately? > > Thanks, > Alasdair -- DaveA -- http://mail.python.org/mailman/listinfo/python-list
