Hi Aivar, To ensure we continue tracking the problems with LUT ranges that you describe, I filed a ticket: http://trac.imagej.net/ticket/2032
Regards, Curtis On Tue, May 14, 2013 at 1:56 PM, Aivar Grislis <gris...@wisc.edu> wrote: > This e-mail discusses some issues regarding what I would call the LUT > range, the min/max value that a LUT is mapped to. > > My motivation comes from SLIM Plugin: In SLIM Plugin the min/max LUT > range is used to colorized fitted pixels and also to control the range of > generated histograms. Suppose a user has fitted some data that has been > gathered for multiple spectral channels. It would be useful to be able to > combine all of the channels when setting min/max, to see how the channels > relate to each other, and also to be able to set an individual channel > min/max independently, to zoom in on an individual channel. I can discuss > further upon request. > > IJ1 only supported one min/max range per image, so only a combined > channels LUT range is possible. IJ2 supports more than one, but it's > limited: > > IJ2 currently supports individual RealLUTConverters and hence individual > min/max ranges only for the special-cased CHANNEL Axis. Having individual > RealLUTConverters is essential to the way RGB images are rendered (you need > separate red, green, and blue converters). However being able to specify > separate ranges is actually not important in that case. > > (Currently there's a bug in DefaultDatasetView > http://trac.imagej.net/ticket/1866 . For RGB images each channel > converter is autoscaled independently, which only distorts the colors. You > want to set the same scale for all. Here's a thought experiment: Suppose > you have an all-blue image with one gray pixel. The only red in the entire > image is in that gray pixel. You don't want to autoscale that red > component value so it becomes the maximal value possible. See the attached > image for 1866.) > > For more flexibility I'd suggest adding two new properties to the Axis > class: One would be whether it supports multiple LUTs. The other would be > whether LUT ranges should be combined. > > The default would be for both properties to be false. We'd have to ensure > they are both true in the RGB, CHANNEL Axis situation. Otherwise a > programmer could tweak these settings before the dataset is displayed, > especially when setting up a custom Axis type. > > Thanks! > Aivar > > > >
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