whiteborders

#!/usr/bin/python

import sys,os,re

borderwidth = 100

for filename in sys.argv[1:]:
    fin = os.popen("identify %s" % (filename), "r")
    content = fin.read()
    fin.close()
    m = re.search(r'([0-9]+)x([0-9]+)', content)
    if m:
        xres = int(m.group(1))
        yres = int(m.group(2))
        ratio = yres/(xres*1.0)
        portrait = 0
        if ratio > 1:
            portrait = 1
            minres = xres
            maxres = yres
            ratio2 = 1/ratio
        else:
            minres = yres
            maxres = xres
            ratio2 = ratio

        borderwidth = minres/23.36

        newminfull = minres + borderwidth*2
        newmaxfull = newminfull/ratio2

        newmin = minres
        newmax = newmaxfull - borderwidth*2

        if ratio > 1:
            newx = newmin
            newy = newmax
        else:
            newx = newmax
            newy = newmin

        print "%s %dx%d (1:%f) -> %dx%d + %d (1:%f)" % (filename, xres, yres, ratio2, newx, newy, borderwidth, (newy+borderwidth*2)/(newx+borderwidth*2))
        
        os.system (("mogrify -geometry %dx%d -border %d " \
                   "-bordercolor white -quality 95 %s") % (newx, newy, borderwidth, filename))