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

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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]

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in a program like this, it makes NO difference , whether i save as PNG or GIF ? (size?) HenHanna <HenHanna@devnull.tb> - 2024-07-02 08:02 -0700
  Re: in a program like this, it makes NO difference , whether i save as PNG or GIF ? (size?) Pieter van Oostrum <pieter-l@vanoostrum.org> - 2024-07-03 13:22 +0200
    Re: in a program like this, it makes NO difference , whether i save as PNG or GIF ? (size?) Greg Ewing <greg.ewing@canterbury.ac.nz> - 2024-07-04 03:36 +1200
      Re: in a program like this, it makes NO difference , whether i save as PNG or GIF ? (size?) HenHanna <HenHanna@devnull.tb> - 2024-07-03 10:31 -0700
        Re: in a program like this, it makes NO difference , whether i save as PNG or GIF ? (size?) Greg Ewing <greg.ewing@canterbury.ac.nz> - 2024-07-04 10:24 +1200
      Re: in a program like this, it makes NO difference , whether i save as PNG or GIF ? (size?) Pieter van Oostrum <pieter-l@vanoostrum.org> - 2024-07-05 13:54 +0200

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