Better look-up-table support

[bogovicj]

• Exported ImagePlus' should have the correct LUT
• Support more general LUTs in bigdataviewer

[tischi]

Hi @bogovicj
please let me know when you work on "Support more general LUTs in bigdataviewer", this is definitely something I am very interested in as well.

1. I think this is closely related to this: Show SourceAndConverter bigdataviewer/bigdataviewer-vistools#40
   Because without this, we cannot freely design our own converters and thus also not apply more general LUTs.
2. And I already started working on LUTs for BDV, e.g. here: https://github.com/tischi/bdv-utils/tree/master/src/main/java/de/embl/cba/bdv/utils/lut

[bogovicj]

@tischi

Thanks for pointing me to those things. I had not yet looked around to see what work has been done where, and so those are very helpful. Maybe the stuff in (2) can be merged into one of the imglib2 repositories. It's just hard to know what exists where.

For example, I have not used these yet:
https://github.com/imglib/imglib2/tree/master/src/main/java/net/imglib2/display

Anyway, I'll be sure to mention you again when I'm really ready to work on it :)