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Re: [APML] noise [was: Benefits of Registar]

To: astro-photo@seds.org
Subject: Re: [APML] noise [was: Benefits of Registar]
From: Matt BenDaniel <matt@starmatt.com>
Date: Thu, 23 May 2002 06:00:54 -0400
In-Reply-To: <20020523033232.44526.qmail@web14308.mail.yahoo.com>
References: <5.1.0.14.0.20020522225517.0276b730@pop3.norton.antivirus>
Reply-To: astro-photo@seds.org
Sender: owner-astro-photo@seds.org

At 08:32 PM 5/22/2002 -0700, Alan Voetsch wrote:
>--- Matt BenDaniel <matt@starmatt.com> wrote:
>>You compensate for low signal by
>> stretching the image during processing. Stretching
>> accentuates the grain.
>
>Hey Matt,
>
>What specifically do you mean by 'stretching'? I'm not
>sure if you're referring to a curving operation, or
>something else.

Alan,

Yes, typically you stretch with curves. Stretching means boosting the pixels values, increasing the contrast. This brightens faint areas, but it also brightens the grain pattern.
--
Matt BenDaniel
matt@starmatt.com
http://starmatt.com


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References:
- [APML] noise [was: Benefits of Registar]
  - From: Matt BenDaniel <matt@starmatt.com>
- Re: [APML] noise [was: Benefits of Registar]
  - From: Alan Voetsch <critter12952@yahoo.com>

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