well...I tried both ur suggestions but didnt give the desired results 1. First method gave me an all black image (i.e all x/16=0) 2. This method doesnt give me an image file as an outfile
Can u suggest how to work around this On 8/19/08, Fredrik Lundh <[EMAIL PROTECTED]> wrote: > Fredrik Lundh wrote: > > > looks like you could save yourself a lot of time and effort by first > > checking if you can install: > > > > http://www.pythonware.com/products/pil/ > > sorry, thought you'd posted this to c.l.python, and didn't see the "import" > statement at first. > > > > > > I am working with PPM/PGM/PBM file formats > > > which have the basic format :- > > > > > > > > where line1= type of file(p1=PBM,p2=PGM,p3=PPM), line2=comment, > > line3=dimension of the image (x and y length),line4=maximum value of > > color( here 15 means 4 bit R,G,B data) > > not really -- the 15 means that the images contain data in the range 0-15. > that fits in 4 bits, but since it's a text format, it isn't stored in 4 > bits. far from it. > > why are you using PPM text files? does the application your using really > require that, or is this just something you thought would make things > easier? > > if you're only interested in making sure that all RGB values in an image > fits inside the 0-15 range, you can simply do: > > im = Image.open(infile) > im = im.point(lambda x: x/16) > im.save(outfile) > > if you insist on writing this out as a text file, replace the "save" with a > simple loop that uses the im.load() accessor. something like this should > work: > > pix = im.load() > > out = open(outfile, "w") > print >>out, "P2" > print >>out, "%d %d" % im.size > print >>out, "15" > for y in range(im.size[1]): > for x in range(im.size[0]): > r, g, b = pix[x, y] > print >>out, r, g, b, > print >>out > out.close() > > tweak as necessary. > > > </F> > > _______________________________________________ > Image-SIG maillist - Image-SIG@python.org > http://mail.python.org/mailman/listinfo/image-sig > _______________________________________________ Image-SIG maillist - Image-SIG@python.org http://mail.python.org/mailman/listinfo/image-sig
