Access meta data in pixel closure

[johannesvollmer]

What can be improved or is missing?

Doing color conversion in the pixel closure when reading a file is not possible, as the closure has no access to meta data (chromaticities).

Implementation Approach

the closure could contain the whole meta data, but that's ugly and difficult to do. Maybe instantiate the whole final object as skeleton without content first? This would be nice with an external iterator approach instead of the current internal one.