Re: [APML] OT: Deep M81 (12 Hours) (My image...really!)

["Kevin Wigell" <kwemail@twcny.rr.com>]

George, I thought this would work for me, but alas, not. When I open a tiff 
image in PixInsight and then save it in FITS format, I'm not able to open 
the FITS file in CCDSharp. I get "An unknown error occurred while accessing 
(filename)" from CCDSharp. But, I am able to open the very same FITS file in 
Photoshop CS.

There are quite a few options in PixInsight for FITS options when saving 
(8-bit unsigned integer, 16-bit unsigned integer, 16-bit signed integer, 
etc), none of which mean much to me. Does anyone have any idea what the 
problem might be (besides me)?

Kevin Wigell
www.kwastronomy.com

----- Original Message ----- 
From: "George Anderson" <tillerman1@videotron.ca>
To: "Kevin Wigell" <kwemail@twcny.rr.com>; "Discussion of Film 
Astrophotography" <astro-photo@seds.org>
Sent: Saturday, March 12, 2005 22:21
Subject: Re: [APML] OT: Deep M81 (12 Hours) (My image...really!)


> Hi Kevin
>
> I believe that pixinsight will allow you to save a file in FITS format.
> So you could read whatever fileformat you have into pixinsight and then
> save it as fits.
>
> George Anderson
> Montreal Canada
>
> Clear skies and good health
>
> Kevin Wigell wrote:
>>
>> Rob, CCDSharp will only read FITS or SBIG formats, correct? How do you 
>> get
>> your file into one of those formats so that CCDSharp can read it?
>>
>> Kevin Wigell
>> www.kwastronomy.com
>>
>> ----- Original Message -----
>> From: "Robert Gendler" <robgendler@worldnet.att.net>
>> To: "Discussion of Film Astrophotography" <astro-photo@seds.org>
>> Sent: Saturday, March 12, 2005 8:04
>> Subject: Re: [APML] OT: Deep M81 (12 Hours) (My image...really!)
>>
>> > Bobby,
>> > Deconvolution algorthms are complex mathematical formulas that
>> > try to approximate what the image would look like without the blurring
>> > effects brought on by seeing, mechanical and optical issues. Its much
>> > more than a sharpening filter. It does an amazing job of tightening an
>> > image
>> > but does come at a cost. The image needs to have good S/N as decon
>> > will bring out noise in the image, particularly the background 
>> > (mottling).
>> > The stars will also acquire halos with aggressive decon. One thing I
>> > should
>> > mention is that for an image to respond well to decon it must be
>> > oversampled
>> > which is another way of saying it needs to be taken at long focal 
>> > length,
>> > at
>> > least 2000mm. There are ways to deal with the noise such as making a 
>> > layer
>> > with a nondecon frame to replace the background and stars. The Lucy
>> > Richardson algorthms IMO are the best. I use CCDSharp (now free off
>> > the SBIG site). I hope this helps.
>> >
>> >
>> > Rob Gendler
>> > email: robgendler@att.net
>> > Web Site: http://www.robgendlerastropics.com
>>
>> _______________________________________________
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