Re: [APML] Noise Reduction and LCD Monitors

["Juan Conejero" <pleiades2004@pleiades-astrophoto.com>]

Hi Chuck,

The current implementation of SGBNR in PixInsight LE is extremely powerful
for large-scale noise reduction. Here are side by side comparisons with your
images:

*** CED214

Comparison (original - SGBNR)
http://pleiades-astrophoto.com/tmp/nr-tests/ced214_SGBNR_compare.jpg

SGBNR parameters used (composite RGB mode)
http://pleiades-astrophoto.com/tmp/nr-tests/ced214_SGBNR_params.jpg

*** Flame Nebula

Comparison (original - SGBNR)
http://pleiades-astrophoto.com/tmp/nr-tests/ngc2024_SGBNR_compare.jpg

SGBNR parameters (luminance/chrominance mode)
http://pleiades-astrophoto.com/tmp/nr-tests/ngc2024_SGBNR_params.jpg

If you make a thorough comparison you'll find that local contrast and detail
are better preserved, while noise is better suppresed, especially in
background and low-contrast areas. With a previous wavelet transform (to
remove small-scale noise), the results would be even better.

Regards,

Juan
______________________________________________________________________
Juan Conejero, Pleiades Astrophoto Team
PixInsight Home Page -> http://pleiades-astrophoto.com/pixinsight/

----- Original Message -----
From: "Chuck Vaughn" <aa6g@aa6g.org>
To: "Discussion of Film Astrophotography" <astro-photo@seds.org>
Sent: Saturday, April 30, 2005 10:00 PM
Subject: [APML] Noise Reduction and LCD Monitors


> List,
>
> I'm sure I'm late to the party but I picked up a new Dell 2405FPW LCD
> monitor this past week. Of course I wanted to view all my old images on
> this new beauty. Was I in for a shock. All my old tricolor images
> looked terrible! They were sooo grainy. On a recommendation from Jerry
> I tried Noise Ninja to clean them up. Wow, what a difference. Here's a
> couple of comparisons.
>
> CED214
>
> http://images.aa6g.org/ced214_compare.jpg   (750KB)
>
>
> Flame Nebula
>
> http://images.aa6g.org/ngc2024_compare.jpg   (500KB)
>
>
> This display is so bright, sharp, and high contrast that it makes most
> of old work look bad. Is there any reason to even use a CRT anymore?
> The Dell even passes the black level differentiation test, the
> difference between level 0 and level 1 is easy to see.
>
> Chuck


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