Masking question

[tloebl]

In processing a  small galaxy, what is the simplest approach to masking both the background and the stars to only process the galaxy? 

[avastro]

Hi,
Look at this post, a clever approach, worked fine in my test, use it in a stretched image even if it works also in linear,  take the time to look at this video.
https://www.youtube.com/watch?v=2sAYyZYcrJI

Antoine
 

[drmikevt]

That video is pretty interesting.  You can also try making a star mask and a range mask.  In Pixelmath:  range_mask - star_mask  will give you exactly what you are looking for.

[tloebl]

Thanks for the informative video. The pixel math subtraction of the star mask from the range mask seems to work well...

[Herbert_W]

Hi,

2 short videos how you can mask a specific area in an image.

http://endor.uv.es/files/data/public/677f32.php?lang=de
http://endor.uv.es/files/data/public/8e4405.php?lang=de

The videos run fast and have no sound - but you should still be able to follow the content.


Best regards!
Herbert, Austria

[avastro]

Hi Herbert
Thank you for sharing these great video, like your smart way of masking.

Antoine

[Alejandro Tombolini]

http://endor.uv.es/files/data/public/677f32.php?lang=de
http://endor.uv.es/files/data/public/8e4405.php?lang=de
Best regards!
Herbert, Austria

Hi Herbert, very clever idea! Thank you for sharing it.

Saludos, Alejandro.