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PNG vs JPG

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PNG vs JPG arnuld 23 Aug 06:42
  PNG vs JPG Michael Schumacher 23 Aug 10:38
arnuld
2007-08-23 06:42:46 UTC (over 17 years ago)

PNG vs JPG

i have created some wallpapers for GNU and want to publish them on my blog. all are under Free Art License. Primarily, i use GIMP and save images PNG format and i see my images are of size 2.5 MB. when i convert them to JPG format they get reduced to only 347 or 600 KB of size without any loss in quality.

i have a slow broadband connection. I can not upload images of size more than 1.5 MB and hence PNG images never got published on my blog. i live with the GNU spirit and use Free formats only like HTML and TXT for articles i use to write.

In GIMP, is there any way i can reduce those PNG images to same size as JPG ?

Why JPG is so lightweight as compared to PNG ? (even when image doe snot have any transparency)

( BTW, is JPG a fre format like PNG ? )

Michael Schumacher
2007-08-23 10:38:31 UTC (over 17 years ago)

PNG vs JPG

Von: arnuld

Why JPG is so lightweight as compared to PNG ? (even when image doe snot have any transparency)

Because JPEG has been designed to be this way. It does achieve higher compression at the cost of quality loss.

The features of both file formats are explained in e.g. Wikipedia (and numerous other sites):

http://en.wikipedia.org/wiki/JPEG http://en.wikipedia.org/wiki/PNG

HTH, Michael