12 replies to this topic

[Akwilliams]

At risk of being a dumb question... Is it possible to process images taken only with an Ha filter and bring out any colour using Pixinsight?  I should add this is with a mono camera...

Edited by Akwilliams, 14 February 2018 - 03:52 AM.

[Akwilliams]

I'm guessing it was not such a bright question...!

[pbkoden]

You can colorize the image, but with only one channel of data, there is no way to separate pixel brightness from chromacity. You will end up with an image where all pixels are some shade of a single color (including the stars).

 

To get color from narrowband, you really need at least two channels to mix together.

[Alex McConahay]

No, not really.

 

If you are using a monochrome camera, you are getting a black and white with gray picture. That is all the information you have. 

 

In order to get a color picture you need contrasting images in at least two areas of the spectrum. For a human eyeball/brain system, make that three. 

 

YOu can do some funny stuff, like make a mask out of the data, and apply the color red to everything showing through the white in the mask. Reverse the mask and make everything (not already turned red) blue.

Another mask on the stars and make them whitish or something. 

 

But, really, you are not making an image, you are making a fantasy.

 

Alex

[Akwilliams]

Thank you...  it’s what I suspected, but you never know till you ask!   I’ll get OIII and SII data in good time so I can then choose how I decide to colorize it.

[Alex McConahay]

>>>>>>> I'm guessing it was not such a bright question...!

 

Bright? meh.

 

Colorful? sure

 

Alex

[bmhjr]

It can be done, but it is purely artistic.  Not sure how she did it.

 

https://www.swagastr...processing.html

[Alex McConahay]

That is a very extended version of what I was talking about above....and Sara is very clear to point out it is art, not an actual data based image. It is beautiful, though. 

 

Alex

[PhysicsStudent]

It can be done, but it is purely artistic.  Not sure how she did it.

 

https://www.swagastr...processing.html

I wish there was some sort of tutorial. I'd like to give this a try, but as a full time student I don't have hours to fiddle around with it and try to get it to work.

[pbkoden]

 

I wish there was some sort of tutorial. I'd like to give this a try, but as a full time student I don't have hours to fiddle around with it and try to get it to work.

 

 

 

Looks like she manually painted color on a second layer in Photoshop, and then blended it into the Ha image. Kind of like a paint by number with lots of artistic license.

[dawziecat]

Nobody has mentioned Carboni's tools for PS?

http://www.prodigita...ll_Version.html

I realize the OP specifically mentioned PI.

His toolset for PS costs 22 USD.

 

Here's Ha data for the Horsehead colorized with his B&W Ha False Color tool . . . 

 

 

He has similar for SII and OIII false color. 

A single keystroke does it. Of course you need PS first though. 

 

[FiremanDan]

You can make some stunning mono images. I personally think an all red image looks worse than a black and white image. 

You could also take your mono image and go starless. I am working on an Orion to Horse Head mono starless. They can be very striking. 

[entilza]

I enjoyed Sara's link. I was thinking about this myself. Would be fun to try.

Edited by entilza, 17 February 2018 - 04:07 PM.