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  • From: John Schinnerer <john@eco-living.net>
  • To: Permaculture Plant Database <pcplantdb@lists.ibiblio.org>
  • Subject: Re: [pcplantdb] Website - images
  • Date: Thu, 16 Dec 2004 20:23:31 +0000

Aloha,

I'll adjust the tracking a bit. Hmmm, smooth gradient from light to dark purple...BTW, does the purplish blue and green irk anyone?

I liked Chad's 3-D looking logo much better than the IMO cartoonish font in current one.

I can't say exactly how PNG works, though I believe the palette is larger, and its similar to GIF in approach.

PNG is the more sophisticated and "free" (e.g. international standards-group-developed public-domian) replacement for GIF (GIF algorithm is owned by Unisys or someone like that and royalties are legally due on software that incorporates it to produce GIF output).

PNG is a "lossless" format, like GIF (JPEG is "lossy," that is, when saving as a JPEG, image data is discarded).

PNG supports both horizontal and vertical image data scans (GIF only one, horizontal I think) so depending on image it may give better compression. However being "lossless," on average it performs about the same as GIF in 8-bit mode.
In 24-bit mode it of course produces much larger image file sizes.

PNG supports both 8-bit and 24-bit color palettes and as Bear says stuff like...

... 256 levels of transparency.

And I believe alpha channel is in the spec also, though I think there's very little support for that even yet.

Plain 8-bit PNGs are reasonably well supported on more recent browsers.
Multiple levels of transparency are more iffy.



--

John Schinnerer - MA, Whole Systems Design
------------------------------------------
- Eco-Living -
Whole Systems Design Services
People - Place - Learning - Integration
john@eco-living.net
http://eco-living.net




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