Least efficient way to display an image in HTML

img2htmltable.py

from PIL import Image

im = Image.open("img2htmltable.png")
mat=im.load()
width, height = im.size

file=open('img2htmltable.htm','w')
file.write('<table width="%d"px height="%d"px cellpadding=0 cellspacing=0 style="border-collapse: collapse;">'%(width,height))

for line in range(height):
    file.write('<tr>')
    for col in range(width):
        color='#%02x%02x%02x' % mat[col,line]
        file.write('<td width="1px" height="1px" bgcolor="%s"></td>'%color)
    file.write('</tr>\n')
file.write('</table>')