Star shape after Masked stretch

Nihal Mirza

Hi Adam, 

This question/issue is with respect to RGB image.

After using masked stretch, I've noticed that the bigger brighter stars have a defined circular structure whereas before masked stretch the star seems ok. See screenshot.

• Is this expected result masked stretch or not?
• If not then what would be the best way to preserve the "natural" shape via Masked stretch

I do realise I'm viewing this particular star @ 1:1 or 2:1, but am just curious about the result.

If I manually stretch it via STF>Histogram Transformation then the star shape is retained, though I do like the result of the masked stretch but not the effect it has on the bigger and brighther stars.

RGB - Before Masked Stretch

RGB_Clone - After Masked Stretch

BlockHead

Nihal,

1. Yes this is expected. A masked stretch star is supposed to look like this. 

2. I have several videos demonstrating!!

I do some work on this in the latest workflow of NGC 3486 .

In addition, I even have a section on in in Horizons!

https://www.adamblockstudios.com/articles/masked-stretch-horizons-lesson

No one... (fill in your favorite instructor here).. nada...have dedicated sections that answer questions like yours.

LOL I want to start quoting Rodney Dangerfield here. :)

-the Blockhead

Nihal Mirza

Haha... thanks Adam.

Will have to ask the Mrs to get me subscription for Horizons this xmas.