Re: in a program like this, it makes NO difference , whether i save as PNG or GIF ? (size?)

HenHanna <HenHanna@devnull.tb> writes:

in a program like this, it makes NO difference
                              whether i save as PNG  or  GIF ?
>
                                 (is one smaller than the other?)
>
black= (0,0,0)
white= (255,255,255)  .............
>
from PIL import Image
from PIL import ImageDraw
>
def newImg():
    img = Image.new('RGB', (120, 120))
>
    for i in range(100):
       img.putpixel((10+i,10+i),   (red, black, white)[i%3])
>
    img.save('test.gif')
    return img
>

In general a 'PNG' image has better quality than 'GIF'. In a 'PNG' image all the pixels that the program generated are still present, exactly as they were generated. In a 'GIF' image, however, pixels may have been altered in order to accommodate a smaller file size. For photo-like images the difference is usually not directly visible to the eye, except when you zoom in considerably. For line-art drawings and images with sharp edges, the effect may well be visible to the naked eye.

In your particular image, there appears to be no difference: all the pixels are present as generated. But this is an exception for 'GIF' images.
--
Pieter van Oostrum <pieter@vanoostrum.org>
www: http://pieter.vanoostrum.org/
PGP key: [8DAE142BE17999C4]