Placing artwork into Flash
About importing Fireworks PNG files
Import Fireworks PNG files into Flash as flattened images or as editable objects. When you import a PNG file as a flattened image, the entire file (including any vector artwork) is rasterized, or converted to a bitmap image. When you import a PNG file as editable objects, vector artwork in the file is preserved in vector format. Choose to preserve placed bitmaps, text, filters (called effects in FireWorks) and guides in the PNG file when you import it as editable objects.
PNG format is one of the best image formats available while writing this article. JPG compression is impressive, it can really reduce file size, but it also have disadvantages. Comparing to PNG it cause a data loose every single file save operation. PNG compression gives You always the same image after compressing and decompressing.
