On Monday 24 January 2005 04:17, Ben Christy wrote:
> Sven Neumann <sven <at> gimp.org> writes:
> > The plug-in is included by default but it can only save MNG and
> > doesn't have any code to load the files again. If you are
> > creating MNG animations with GIMP, you always need to keep a copy
> > in XCF format.
> > Sven
> If there is a write plug-in then how hard is it to make a read
> plug-in? Is it a copyright conflict?
> The source should be available if the plug-in is included with
> distribution and all that; logic says all that needs to be done is
> change outputs to inputs (of course that would assume that logic
> applies here)
Uhhh...actually it is a bit more complicated than that.
MNG is a complex standard. Inside a MNG file there may lie PNG or JPEG
image data, the differences from one frame to another may be
'differential' -i.e. only the data of the parts that had changed is
stored, or a replacement of the previous image for a new image.
The writing plug-in actually performs a rather naive MNG save, saving
just a frame sequence (like an anim. GIF). The result is a valid
MNG, but the plug-in only deals with a subset of the standard, and
reading mng's recorded by other programs would require full suport
for the specification.
That of course is desirable, and a 'non naive' mng saving would be
great. But AFAIK there is no one working oin that in the moment.
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