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gif and png file difference

Posted on 2008-10-01
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Last Modified: 2011-10-19
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?
about-03.png
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Question by:Hiroyuki Tamura
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by:BongSoo
BongSoo earned 125 total points
ID: 22625911
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:
http://en.wikipedia.org/wiki/Portable_Network_Graphics 
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BongSoo earned 125 total points
ID: 22626201
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.
     
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by:Hiroyuki Tamura
ID: 31502120
THANK YOU
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