-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 On Friday 19 July 2002 4:22 am, shane wrote:
> On Thursday 18 July 2002 6:50 pm, Tom Brinkman did speak unto the > huddled > > masses, saying: > > Take any .gif file and just rename it as a .png, you'll get the > > same image when you open it (or v'versa). You can also take M$ > > .ico's and convert them to .gif's or call'em .png's. > > can you really? then why are all the png images i make so damn big? > i tried to convert my site from jpg to png about 8 months ago, every > image tripled, or more, in size! maybe i am doing something > wrong...... You're falling into a common error; the two are, algorithmically, chalk and cheese. JPG is lossy compression. In other words, In The Beginning there was a 'pure' image (even if only going down the wire to a scanner) which the JPEG algorithm deliberately slightly degraded to save disk space but preserve an acceptable image quality. Hence the slider on 'save as JPEG' which allows you to change the degree of compression from 0 - perfect reproduction - to 100 - infinite degradation. PNG is lossless. Thus the image is 'pure' so has a bigger file size but 'perfect' quality. So converting JPG to PNG is gaining no value (doing the conversion will in crease the file size but won't undegrade the image) whereas PNG to JPG may be worthwhile. PNG was developed by Compuserve because of the _last_ great image spat, namely Unisys claiming patents on GIF. Alastair - -- Alastair Scott (London, United Kingdom) http://www.unmetered.org.uk/ -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.0.6 (GNU/Linux) Comment: For info see http://www.gnupg.org iD8DBQE9N8n7XzGCRjP1DsMRApNZAJsGFUF6LPH3ynTaS31DTJRwYJg08wCfZKTG f2gxLzQUSXA0Mv59nKB0Ngc= =7p1b -----END PGP SIGNATURE-----
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