Are you able to set and see the transparent background of your Image in Fireworks? If yes then its just an export setting you need to deal with. Check out my tutorial on using transparency in Fireworks at: http://www.smartwebby.com/free_tutorials/website-design-how-to/transparent-background.asp
I am convinced there is something wrong with fireworks... I've been trying to do this all morning. I managed to do it 1 time with a file... I have not been able to do it since.
I've tried png 8, png 32, I know how to switch to preview mode / optimized mode and preview the transparency, it's there, it shows up. However when I save off the flattened png and I put it in my HTML, it's gone.
This is nuts, I've used the same steps, I've tried the same process over and over again and randomly it works but more often than not, it doesn't. After spending about 40-50 hours on a design in fireworks witch custom styles and libraries, I now have to recreate all this work in photoshop because photoshop at least is consistent and doesn't make me want to throw a temper tantrum because it does what it is supposed to do.
Adobe just needs to kill off fireworks if they are not going to fix this issue, I've seen it as far back as cs4 and it's still there in cs6...
of course i did... r u kidding me?
i m trying to save with alpha channel, of course canvas is transparent..
i can save fw-png format with alpha channel. however when i make flat png, background color is being added at saving process.
r u sure that u really understand my question and my problem?
because there is an unsolved issue here started at Nov 4, 2011 9:14 PM and the solution u suggest has already been suggested 3 years ago...
besides i found a solution as: just save as fw-png and import to photoshop and web-save the doc as png..
Sorry, i was not certain about your level...
You may be interested in knowing that another tool optimizes png files beyond what Fireworks can do - and I would avoid Photoshop's abysmal png export for production. As you are probably aware of, Photoshop's web export does not allow us to save an indexed png file with full transparency - something FW was always good at.
Try Color Quantizer: http://x128.ho.ua/color-quantizer.html
It allows for png files with full transparency to be saved with limited colour palettes exceeding 256 colours! With CQ you can optimize png files to the fullest, while still retaining an excellent visual quality, since you can optimize easily to a limited palette of, for example, 512 or 1024 (or a custom number of colours). Extremely useful.
It also optimizes the transparent areas, and will automatically remove any bitmap data from those areas (which are not visible).
And, even better, a simple quality mask brush tool assures you have maximum control over the inclusion of even tiny splotches of colour you wish to retain.
I have long left FW behind for my png optimization, because of CQ. It's brilliant, and still somewhat of a hidden gem. Try it out, you might be pleasantly surprised. And it's a free download.