Re: [APML] New Image: Cassiopeia - Wide Angle

[Vicent Peris <vicentperis@ya.com>]

Chris,

see this:

www.cepheusastrophoto.com/APML/NoBlur.jpg
www.cepheusastrophoto.com/APML/Blur.jpg

The first image is the resulting of increasing the master saturation
by +25. The second, before increasing saturation, I have duplicated
the background layer and have made to the new layer (which has
the blending option of "Color") a "prohibitive" gaussian blur of 2 pixels;
after, I have increased the master saturation of this layer to +25, leaving
intact the background layer. Comments welcomme.... :-)

Vicent.




>Date: Thu, 24 Apr 2003 20:13:02 +0200
>To: Discussion of Film Astrophotography <astro-photo@seds.org>
>From: Vicent Peris <vicentperis@ya.com>
>Subject: Re: [APML] New Image: Cassiopeia - Wide Angle
>
>Hehe, but I make SGBNR to the chrominance :-). In fact, almost allways
>I make SGBNR separately for the luminance and thr chrominance.
>To do this, I transform the image to Lab color. I extrac the luminance and
>make to it an SGBNR. After, I make an RGB with the "a" and "b" channels,
>making black the third channel of the RGB, and load this on SGBNR.
>This eliminates local color grainiess. Sometimes, a simple blurring of
>1 - 1.5 pixels of the chrominance works better... Is like making, for
>a CCD photo, an RGB composite with x2 binning.
>
>Vicent.
>
>PD: See my newest version, I have reduced that horrible banding caused
>by Photoshop. It's at 50% resolution:
>www.cepheusastrophoto.com/APML/CassiopeiaVertical3.jpg
>
>
>At 10:24 24/04/2003 -0700, you wrote:
>>Vicent, however - by doing that you can loose color resolution, which for
>>photo quality film shots will tend to colorize more  than the extent of
>>the tiny red nebula.  A better way is to make a mask and increase the
>>saturation of objects selected by the mask.  Another amusing method, which
>>is is aesthetically appealing is to use the sponge tool in PS and brush on
>>saturation onto just the interesting regions - ie. nebula.
>>
>>Chris

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