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semi-transparent PNG8 in Imagemagick - is this possible?

Posted: 2007-09-18T07:23:06-07:00
by wortell
saw the article on sitepoint.com - (sorry, i don't mean to disobey rules, can I post the link here? just so people know what I'm talking about?) PNG8 - The Clear Winner

talks about using PNG8 setting in Fireworks and setting it from an INDEXED transparency to an ALPHA transparency and getting a transparent (yet lower quality) PNG image, that transparencies well onto IE6 and other browsers which TYPICALLY don't do well with transparencies...

Can I use the PNG8 setting in IMAGEMAGICK while getting an alpha transparency instead of an indexed transparency?

thanks...

Re: semi-transparent PNG8 in Imagemagick - is this possible?

Posted: 2007-09-23T20:26:29-07:00
by anthony
At this time. NO. PNG8 in IM is handled very much like GIF with a single boolean transparency. No semi-transparency.

You can use something like pngcrush, optipng, pngquant, and pngnq
for shrinking a IM generated PNG image beyond what IM can output.
The last two programs are lossy, as thy generate PNG8 images (with semi-transparency) from a full PNG images.

No guarantees.