A Trous Wavelets Panel is Grayed Out

I would like to try the A Trous Wavelets but he panel is grayed out for me. I’ve tried 16 bit TIFF and 8 bit JPEG. What is the requirement for this function to work? Thank you.

It’s grayed-out when a sequence is loaded, did you open a single file?

Yes, I am working on a single file only.

Which version?

Pretty sure one sequence is loaded indeed.

Oh, you mean the dialog is grayed-out.
Just click on Execute first.

That worked, thank you. Now I just need to experiment to figure out how to get the best results.