max-merge option on axis in frame selector

[manthey]

When in axis mode, we could have a check box next to each axis that would show a max-merge on that axis. When enabled, the slider would be disabled.

[manthey]

Also called Max Intensity Projection

[manthey]

Description:

Suppose a image with 3 z values and 4 time values. We currently have two sliders, one for z and one for t. For this example, suppose our image is white. If you check "max-merge" next to an axis, the slider is disabled. If you did this on z (and the IndexStride of Z is 1, The style is now {"bands": [{"band": 1, "framedelta": 0, "palette": "white"}, {"band": 1, "framedelta": 1, "palette": "white"}, {"band": 1, "framedelta": 2, "palette": "white"}]}. Basically, we ask for all z-stack frames -- the default compositing is lighten, so you get the brightest pixel from those frames. If you did max-merge of t (IndexStride of 3), you'd have four entries with the framedeltas of 0, 3, 6, 9. If you did max-merge of both, you have all twelve frames in the style.

If you are in channel compositing mode, you repeat the palette for each channel for each max-merge entry and have the appropriate framedelta for both the channel and max-merge entry.

The net result of this is you see the brightest pixel from any frame that has been max-merged. Somethings probably make no sense to max-merge (like an XY axis), but I wouldn't prohibit any of them -- if it has a slider, it should have a max-merge checkbox.

[manthey]

This was added in #1306.