Quoting Jakub Steiner <[EMAIL PROTECTED]>:

On Thu, 2005-02-10 at 03:08 +0100, Simon Budig wrote:
Eric Pierce ([EMAIL PROTECTED]) wrote:
[MM Fireworks]
He told me that the default file format is png!  I called him a bold
faced lier, but he swears up and down that png is the default format.
I asked him about layers, and he said the pngs that Fireworks saves
can DO LAYERS.  I haven't seen it firsthand... is there any truth to

PNG can handle custom application specific chunks of data, so it is perfectly possible that Fireworks uses custom data blocks, not specified in the PNG standard. I have no idea if MM published these extensions, but a PNG file just using the standard chunks cannot handle multiple layers.

This actually sounds very interesting. I really like the way Inkscape's native format uses the SVG with some extensions to store similar extra attributes of the image, yet it's correctly parsed and rendered by any SVG renderer.

Copied from Firework's online manual...

In addition to supporting PNG as an output format, Fireworks actually uses PNG
as its native file format for day-to-day intermediate saves. This is possible
thanks to PNG's extensible ``chunk-based'' design, which allows programs to
incorporate application-specific data in a well-defined way. Macromedia has
embraced this capability, defining at least four custom chunk types that hold
various things pertinent to the editor. Unfortunately, one of them (pRVW)
violates the PNG naming rules by claiming to be an officially registered,
public chunk type, but this was an oversight and should be fixed in version

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