Aloha Christian,
The GIF/PNG-story continues... Regarding your experiments:
> I've done some experiments with converting our icons (found at
> previews, sound files etc) from gif format to png by means of the
> ImageMagick 'convert' tool. To see the results of that you may
> have a look at my web archive of recorder music scores found in a
> section of "The Recorder Player's Page"
> http://www.saers.com/recorder/mondrup/.
> For this page I have been reusing the icons of the Icking archive
> converted (allmost all of them) to png format. You'll notice (at
> least with Netscape browsing) that the background colour of the
> sound file icon found near the top of the page is not transparent
> to the background color of the web page as is the case with the
> original gif image used in our archive.
I viewed your page at www.saers.com with Internet Exploder 5.0 and
noticed that the transparency of sound.png is OK. So, I fear that it is
Netscape that does not (yet?) support transparency in PNG-files.
Consulting the PNG website http://www.libmng.com/pub/png/pngapbr.html
revealed the following w.r.t. Netscape vs PNG:
<snip>
Netscape Navigator [Netscape Communications] (Unix/X, Windows 9x/NT,
Mac OS, OS/2) - version 4.04 and later; progressive display
(replicating method); full alpha and gamma support as of version
6.0PR2 (see Mozilla above) but no transparency or gamma support
whatsoever in version 4.x;
</snip>
My guess is, that you use Netscape 4.x or older...
> What I would like from you is some technical advice on gif->png
> conversion of our icons. Besides I would also appreciate some
> references to collections of png icons. The results of my own web
> search for such collections were poor:-(
Personally, I use "giftoppm --alpha" and "pnmtopng -alpha" in a 2-step
process. (Cannot do it in a pipe, because the latter tries to read the
alpha channel file before the former has fully written it.). I suppose
that ImageMagick's convert does the same.
For a nice collection of (useful?) PNG images, have a look at
http://www.pngart.com/IMAGES.HTM.
HTH,
Arjen
--
Arjen Bax | CMG Noord-Nederland B.V. | Sector Telecommunications & Utilities
Postbus 70237 | 9704 AE Groningen | The Netherlands
TEL +31-50-5219500 | FAX +31-50-5219504 | WEB http://www.cmg.nl
Java? I've heard of it. It is what I drink while hacking Perl.
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