Re: [APML] NGC 6946

[<cschur@cybertrails.com>]

Tony, a common problem is thermal focus drift during the RGB sequence, I
get bloated blue stars if the temp is changing rapidly during the night. 
Other than manually desaturating them, you can try the photoshop minimum
filter with a fade adjust to get the blue closer.

Chris Schur

> Hello all,
>
>     I better post this before you read somewhere in some obscure
> headline "Astrophotographer commits suicide over astro image..."
>
>     Bad seeing makes it almost impossible to make a CCD work ... they're
> just too sensitive ... but I did what I could to make this fly...
> the worst thing that happened was really bad seeing during the green
> exposure... all the stars bloated in relation to the rest of the
> colors, so that when the RGB was combined, there were nice green
> rings around the stars ... wonderful! If anyone knows some way to
> deal with that, I would sure like to know. I had to fix this the
> hard way ... star by star ... I must be nuts.
>
>      http://www.astrophoto.com/NGC6946.htm
>
>     Comments always welcome...
>
>          Tony



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