Author Topic: New MaskedStretch Tool  (Read 23073 times)

Offline Alejandro Tombolini

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Re: New MaskedStretch Tool
« Reply #30 on: 2014 July 25 14:24:55 »
As you can see below, I get an odd coloration of a star.  I tried several settings but not sure how to avoid this?

Hi Torsinadoc,

I think that there are two alternative to solve it. The main is to have data that allow make a HDR, and the second is to repair the stars.
I do not have a good set of image to make an example with HDR but I am just processing an Antares that is useful to show the reparation.



First I have applied Masked Stretch tool to a crop of the image with Antares using the default values. As expected the center of the star does not look fine.



Over a clone of the linear image apply the Repaired HSV Separation script. Set the desired levels to Clip Shadows and Repair level and check V- no repairs for the scrip to generate also the Unrepaired V



You will get four new images:
Unrepaired V
V
Sv
H



I have seen in some cases that is better to generate the new image using the Unrepaired V instead of V. Using channel Combination tool generate the new image.



The center of the stars look better now in the linear image:



Finally apply the same Masked stretch process to the repaired image.



I also recomend that you see Bob Andersson post about this script.

Saludos, Alejandro.

Offline Torsinadoc

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Re: New MaskedStretch Tool
« Reply #31 on: 2014 July 25 17:38:01 »
thanks. ill try it out

Offline Jose Joaquin Perez

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Re: New MaskedStretch Tool
« Reply #32 on: 2014 July 27 18:03:40 »
Thanks Alejandro for sharing this interesting and useful workflow!!

Abrazo...maestro (-:
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José Joaquín Pérez
Rancagua, Chile
www.astro-austral.cl