Want to mask only the peak of each island

[ktrehaeven]

Hi

Is there a way of masking only the peak pixel of an island instead of all its significant pixels?

[o-smirnov]

Not that I know of, but it should be very simple to add an option like that, feel free to make a PR. :)

What do you need such a feature for, anyway?

[ktrehaeven]

I want to see if subtracting only the peak pixel during vis plane subtraction improves the oversubtraction of the compact sources I'm seeing. Or perhaps just the pixels above the FWHM.

[o-smirnov]

Yeah I don't think a single pixel will work -- if a compact source straddles two pixels (as it almost always will), you want to be cleaning both. So maybe peak pixel + 1 pixel dilation.