Best File Format For Online Line Art?

I thought the conventional wisdom was that all line art for the screen should be saved as GIFs, all photographic line art should be saved as JPEGs.
Then PNGs came along and offered an alternative to GIFs.
I've been exploring this because I've been having a problem when exporting line art from Illustrator 8 as a PNG and opening it in Fireworks MX, where it appears washed out.
I did a bit of research among comic strip artists -- the art I'm exporting from Illustrator is a comic strip -- and came up with conflicting results.
Dilbert seems to save black and white line art as GIFs, e.g. http://dilbert.com/comics/dilbert/archive/images/dilbert2008611230313.gif
... But its Sunday colored strips seem to be saved as JPEGs, e.g. http://dilbert.com/comics/dilbert/archive/images/dilbert2008040261966.jpg
Meanwhile Donnesbury seems to save colored comic strips as GIFs, e.g. http://images.ucomics.com/comics/db/2008/db080406.gif
Any thoughts, suggestions?
Thanks.

I assume your line art is drawn as vector art in Illustrator, correct?
As far as I'm concened, the "best file format for online line art" would be .swf, because it would retain its scaleable vector nature, and the Flash Player is most likely embedded in any reasonably recent computer's browser.
But a little simple experimentation would be in order regarding file size. SWF (as exported from Flash, not necessarily AI) is very efficient. But the complexity of the line art could still make a given image require more bandwidth as .swf than as a rasterized version.
The former conventional-wisdom regarding PNG is the old "not supported in older browsers" saw. I see even Firworks's online help still says:
> However, not all web browsers can view PNG graphics.
Personally, I think its way past time to stop cow-towing to outdated browsers and use PNGs anyway. So if it were me, and the nature of my line art required rasterization for online use, I would use PNG for its obvious advantages. But then, my livlihood is not affected by some minority of outdated web viewers not being able to view my PNGs.
I would think that whatever color problems you are having in getting your AI files exported to PNG can be worked out with a little investigation/experimentation. (PNG supports color management profiles, so that alone may be your problem, and may be easily fixed in your workflow.) GIF is by definition limited to a subset of colors. JPEG is by definition a lossy compression format. So there are certainly precise color-accuracy issues with those overused formats, too.
But again, that's just me. What little I do in web graphics that would involve this issue doesn't really affect my livelihood. Lowest-common-denominator compatibility may be more important to you.
> Gilbert seems to...
> Doonsbury seems to...
The two images are very close to the same size (132K & 125K). They both include contone grads. Between JPEG and GIF, I would expect JPEG to more consistently yield acceptable results. Since GIF is limited to an 8-bit lookup table, I would expect aberations such as unwanted banding to be more likely in GIF if the artwork contains many colors and alot of highly-rendered shading.
Since you specify
line art, though, that would rule out contone fills, and you could use GIF with a very small color table.
On the other hand, you do not specify whether you want to use transparency in your line art images. If you do, PNG would be far superior, because it supports true alpha transparency. In a GIF, if you can only make one particular color transparent. So even with line art, if the line art is antialiased at all, you'll have the ugly halos so commonly seen in GIFs when displayed on a wrong-colored background.
The only functional "advantage" that I see in GIF over PNG is its multi-image capability, for quick & dirty frame-by-frame animation. My personal animation efforts focus entirely on Flash/SWF, and use scripted animation whenever possible to avoid frame-by-frame. But I recognize the simplicity convenience of animated GIFs for web banners and those (often-annoying) moving icons and such.
JET

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