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Should there be a list of image formats that "MUST" be supported, e.g. PNG? What about formatters or devices that can't do images at all?
[taken from "Design Considerations" draft]
I'm not sure this is a good idea. We don't put any constraints on the output format either, e.g. we don't say you mus support PDF or PNG as output format, nor do we specifiy anything about required fonts etc. So if we add PNG as required image, we'd risk getting into the other formats too. However if other people feel we need this because of real problems, I'm not opposed to this. (FYI Scriptura does supports PNG as image format).