[Tutor] greyscale bitmaps with python (original) (raw)

John Fusco fusco_john at yahoo.com
Sat Jul 10 01:27:55 CEST 2004

Thanks for the tips, but neither passed the "quick and dirty" test.

The xbitmap is monochrome so that won't work (too dirty).

PIL works, but I'm stuck with Python 1.5.2 and I need full source to build for Python 1.5.2 (not quick enough).

I finally settled on the pattern below, which creates a PGM file and uses 'ee' to display.

Regards, John

import os

def pgmhdr(rows,cols,depth): return "P2\n%d %d\n%d\n" % (cols,rows,depth)

class PgmImage: def init(self,num_rows,num_cols,depth,pixels):

    assert(num_rows*num_cols==len(pixels))
    self.num_rows = num_rows
    self.num_cols = num_cols
    self.depth    = depth
    self.pixels   = pixels

    self.fmt = ("%d " * num_cols + "\n") * num_rows

def show(self):
    fn = "/tmp/foo.pgm"
    file = open(fn,"wb")
    print file
    file.write(self.pgmdata())
    file.close()
    os.system("ee " + fn)

def pgmdata(self):
    return pgmhdr(num_rows,num_cols,256) + self.fmt %

tuple(self.pixels)

if name == "main": num_rows=256 num_cols=256 pixels = range(num_rows)*num_cols

PgmImage(num_rows,num_cols,256,pixels).show()

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