[Feature Request] Add a mask function to "Render Configuration"

[Firestar-Reimu-Pro]

For example I want to render the image > 3 sigma, or maybe image between (10, 1000)

and I want all others to be NaN,

while now Render Configuration only configures the vmin/vmax, but not omitting the data outside vmin/vmax,

also cursor on colorbar can only control one parameter, cannot make more complex masks

[kswang1029]

you can use the LEL feature (https://casadocs.readthedocs.io/en/stable/notebooks/image_analysis.html#LEL-Examples) in the file browser to mask out pixels. Example below:

and you will see

Without LEL masking, it is

[Firestar-Reimu-Pro]

but this is not very flexible, for example I want to drag my cursor to dynamically change the mask and image

also, file like hi4pi-hvc-vlsr-gal-car.fits with - in filename cannot be calculated