Hi,

My DSI-C seems to be more sensitive to blue light than to red or green, so sometimes I get stars saturation in blue channel but not in the other channels.
When I calibrate and color balance those frames,  get stars that are white in their borders and blue in the center.
How can I process those frames to get white stars?

Best regards,

Germán

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Germán Bresciano
Montevideo, Uruguay
http://picasaweb.google.com/German.Bresciano
Hokenn 150 750 PEQ3-2 w/dual axis drive
Meade RB-60 (60mm x 700mm)
Meade DSI-C, Vesta Pro SC1.5, SPC900NC SC1
Bushnell binoculars 10x50mm

Can you post an example?

Chuck

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Chuck Reese
CDIP Certified: Nebula, Galaxy, Solar System, Stars & Clusters Imager
CDIP Mentor: Nebulae & Solar System Categories
For information on the Certified DSI Imager Program, see:
http://autostarsuite.net/forums/1427/ShowForum.aspx

ChuckR54 wrote:

Can you post an example?

Chuck

Dear Chuck,

thank you for your answer.
There is an example at http://autostarsuite.net/photos/cert_galaxies/category1353/picture17342.aspx
The upper left star has a blue center.
The problem is that the RED channel has a hole in the center of the star.

Best regards,

Germán

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Germán Bresciano
Montevideo, Uruguay
http://picasaweb.google.com/German.Bresciano
Hokenn 150 750 PEQ3-2 w/dual axis drive
Meade RB-60 (60mm x 700mm)
Meade DSI-C, Vesta Pro SC1.5, SPC900NC SC1
Bushnell binoculars 10x50mm

German, if you have a post processing softwear you can simply "Paint" the middle of the star with a brush tool.

Also check out this site for some good advice on post processing techniques.

http://www.waid-observatory.com/articles.html

BOL and post more.

JimT 

What file format did you save to, and what software did you use to process the image?

You really shouldn't have clipped the data at 30 seconds exposure, so unless you used an 8-bit file format in Envisage for the capture, I'm guessing in happened in post-processing.

Did you "save all uncombined"? If so, please post one of the original subs...

Chuck

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Chuck Reese
CDIP Certified: Nebula, Galaxy, Solar System, Stars & Clusters Imager
CDIP Mentor: Nebulae & Solar System Categories
For information on the Certified DSI Imager Program, see:
http://autostarsuite.net/forums/1427/ShowForum.aspx

ChuckR54 wrote:

What file format did you save to, and what software did you use to process the image?

You really shouldn't have clipped the data at 30 seconds exposure, so unless you used an 8-bit file format in Envisage for the capture, I'm guessing in happened in post-processing.

Did you "save all uncombined"? If so, please post one of the original subs...

Chuck

Dear Chuck,

I allways use FITS files.
I think that you are right, it happened in the post-processing. I redo the post processing again an the problem is gone.
Thank you very much.

Regadrs,

Germán

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Germán Bresciano
Montevideo, Uruguay
http://picasaweb.google.com/German.Bresciano
Hokenn 150 750 PEQ3-2 w/dual axis drive
Meade RB-60 (60mm x 700mm)
Meade DSI-C, Vesta Pro SC1.5, SPC900NC SC1
Bushnell binoculars 10x50mm