Why can't I export a 24 bit PNG with alpha transparency?

I have just upgraded my Macromedia Studio 8 to Adobe CS3, and
it seems that I still can't export a 24 bit png with transparency
from Fireworks (Photoshop can do it, but it's just not suited for
volume graphic production). Anyone know something I don't, or can
someone at least explain why I can have alpha transparency on 8 bit
and 32 bit, but not 24 bit pngs? Currently, I'm planning to export
everything from Fireworks, then batch-process through Photoshop to
reduce from 32 bit to 24 bit, which is just... gah! Words fail
me.

Kathleen13 wrote:
> I have just upgraded my Macromedia Studio 8 to Adobe
CS3, and it seems that I
> still can't export a 24 bit png with transparency from
Fireworks (Photoshop can
> do it, but it's just not suited for volume graphic
production). Anyone know
> something I don't, or can someone at least explain why I
can have alpha
> transparency on 8 bit and 32 bit, but not 24 bit pngs?
Currently, I'm planning
> to export everything from Fireworks, then batch-process
through Photoshop to
> reduce from 32 bit to 24 bit, which is just... gah!
Words fail me.
>
If I'm correct, 8-bit png supports index transparency just
like GIF's
do. 32-bit png's support alpha channel transparency, so you
can get
variable or partial transparency in a full color image(8 bits
for each
color and 8 bits for an alpha channel) and 24-bit png's are
similar
jpegs, only you get lossless compression and no user-defined
settings.
So essentially, when you export a 32-bit png file you are
exporting a 24
bit color image with an 8-bit alpha channel.
Jim Babbage - .:Community MX:. & .:Adobe Community
Expert:.
Extending Knowledge, Daily
http://www.communityMX.com/
CommunityMX - Free Resources:
http://www.communitymx.com/free.cfm
.:Adobe Community Expert for Fireworks:.
news://forums.macromedia.com/macromedia.fireworks
news://forums.macromedia.com/macromedia.dreamweaver

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