[Digikam-users] RAW and PNG compression

Arve ahaf at tele2.no
Fri May 22 16:58:14 BST 2009


Francisco Lorés Ara skrev:
> The same is true for me too. RAW files are about 12-15 MB, PNG files 
> grow > 50 MB!!!! I use a Canon EOS450D (12.2 Mp).
>
>
In a RAW file there is only value for one colour for each pixel, 
normally 12 - 14 for each bit.
In a PNG file you have value for 3 colours for each bit. In a 16 bit PNG 
file you have 16 bit for each colour giving 48 bit for each pixel.




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