Pesky Reflections !

[pscammp]

Hello all,

Hoping someone may be able to help me out here !

Attached is a zoomed in portion of a final integration of M42, as you'll see I have suffered from a nasty reflection from my mirror caused by the very bright star which is just below M42. The reflection is showing as green almost in the center of the attached image and is really annoying.

The attached image has the STF applied with 'Link' turned off

Is there any possible way of removing this reflection or am I stuck with it   

Many Thanks for any help

Regards
Paul

[aworonow]

two things come to mind:
1) use the clone-stamp tool to brush it away. Keep the brush very soft and minimally opaque
2) make a mask (maybe in Gimp, or some other detestable painting program, would be most simple) and apply it then desaturate the reflection color (mostly blue?) and adjust the other colors (in curves?) to mimic the broader background.

I am sure there must be at least 5 more ways to do it.

Alex

[oldwexi]

Hi Paul!
Using Clone Stamp for manipulating the image is destroying the data and is therefore not recommended.

Use the data in the image to build a mask.

Using the Script "ColorMask" you can select the Cyan data out of your image
und use the resulting image as a mask to remove the cyan reflection data in your image.

So,  put the Cyan Mask over the image,
call MuktiscaleMedianTransform (MMT),
X  the longwave layers 4 to 8  !
move triangle over your image and
this removes the cyan longwave layers.

As this would be done over the whole image  it is recommended
to do this only on a preview over the specific area und return back the corrected Preview data
with the Script "SubstitutewithPreview into the main image.

You can do this in a second and third step also with Curves and Desaturation.

Never use gimp or other 8-Bit or 16 Bit painting programs as you will loose
all the dynamic in your image.
You dont have to go outside PI and the 32-Bit dynamic room for any solutions even if you want
do steps like Alex recommends...  PI offers these not recommended possibilities also but
without loosing data.

Gerald

[John_Gill]

That is a really kool tip!

Thanks.
John