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gif and png file difference

i'm trying to make web image from photophop.
i can create very small letter on transparency background with png but gif.
gif image gets too thick with this small letter.
do you know why it happens?
Hiroyuki Tamura
Hiroyuki Tamura
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I believe it is probably because gif is not quite as 'good'  of a format than png. (assuming that as many other variables that might be affected are the same such as file resolution, image color space, etc.)
For instance, this quote from wikipedia: "Portable Network Graphics (PNG) is a bitmapped image format that employs lossless data compression. PNG was created to improve upon and replace GIF (Graphics Interchange Format) as an image-file format not requiring a patent license."
For more about png:
Here is a comparison from that same article:
Comparison with GIF
  • On most images, PNG can achieve greater compression than GIF (see the section on filesize, below).
  • PNG gives a much wider range of transparency options than GIF, including alpha channel transparency.
  • PNG gives a much wider range of color depths than GIF (truecolor up to 48-bit compared to 8-bit 256-color), allowing for greater color precision, smoother fades, etc.[10]
  • GIF supports animation while PNG does not (see the section on animation, above).
  • PNG images are widely supported (for instance, with modern web browsers and office software), but not as widely supported as GIF images.
Hiroyuki TamuraField EngineerAuthor Commented:
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