Re: [APML] 7331 (again!)

["Mike Cook, AF9Y" <mwcook@concentric.net>]

First, 

I remember when comparative discussions on similar film and CCD
image brought howls of discontent here on APML.  I think it is very
productive to have these discussions.

Although Tony's brighter blue may be less "true" in color, it just plain
looks better.  I think contrast, dynamic range,  color saturation and
small color shifts are all appropriate variables for the canvas of an
astro-artist.

I agree with Bobby's comment about the fuzzyness of this CCD image.
Many of Gendler's RC images appear to have a haze over
the entire image.  I don't see this at all on his M31 shot (which I
believe is better than all the film images).  I wonder if the magnification
of the RC is reaching a point where atmospheric blurring is a predominate
factor.  With the image scale we just see it up close and personal.  Maybe
a different form of masked processing could reduce this.


>From:           	"Bobby Middleton" <bobm@koyote.com>

> I can see better points for each image.
> 
> Tony's film image has better detail of the dust lanes with more contrast in
> them. To see this good look at the smaller face-on satallite galaxie's dust
> lanes at above left of 7331. His stars also don't have the color saturated
> out. I don't agree with his final colors; I would darken up the image a bit
> while stretching a little more (not much). I would also lower the green in
> curves just a bit. With these adjustments I like the color of the film a bit
> better than the CCD image. Tony's image also shows the Ha regions much
> better.
> 
> Rob's image is of course much better speaking in terms of grain, but there's
> a "fuzziness" there not in the film image. Rob are you doing some kind of
> moderate blur? Still, with the grain of Tony's image, the CCD image does
> have a "smoother" look.  And Rob does have some of the very faint mag stars
> that Tony does not have; pointing to the sensitivity edge of CCD over film.
> 
> I personally feel that both images are close enough in greatness to leave
> the final decision up in the air. And with a good TP "L" shot, (or
> tri-color) the film image could easily surpass the CCD image in quality.
> Just my subjective opinion. Both are fantastic images!
> Bobby Middleton
> 
> "God doesn't play dice".........
> Albert Einstein on blind chance
> http://www.koyote.com/users/bobm/astro1.htm
> 
> ----- Original Message -----
> From: Robert Gendler <robgendler@worldnet.att.net>
> To: <astro-photo@seds.org>
> Sent: Saturday, September 22, 2001 7:42 AM
> Subject: Re: [APML] 7331 (again!)
> 
> 
> > Tony,
> > Really extraordinary effort and great widefield image.
> > Not quite CCD though. I think with the dimmer detail
> > CCD still outperforms. Again here is my CCD version
> > of ngc7331 for comparison.
> > http://robgendler.astrodigitals.com/7331.html
> > Rob Gendler
> > Email: robgendler@att.net
> > Web site: http://robgendler.astrodigitals.com
> >
> > ----- Original Message -----
> > From: <Tonyhallas@aol.com>
> > To: <astro-photo@seds.org>
> > Sent: Saturday, September 22, 2001 12:41 AM
> > Subject: Re: [APML] 7331 (again!)
> >
> >
> > > Hello everyone,
> > >
> > >     Last night I used TWO HOUR hypered Kodak Royal Gold 200 @ 90 minute
> > exposures of 7331 (great test object) and recorded a LOT more than the
> > previous negatives. Tracking was very good, as was the focus this time. I
> > "polluted" these better negatives with the original Picture Window result
> > and came up with a new image and a close up.. you can see H II regions and
> > galaxies everywhere... in the close up, the companion galaxy to the upper
> > left even has two faint H II regions showing. As the signal to noise ratio
> > is increased through PW more detail and color is showing up... almost CCD!
> > :-)
> > >
> > > You can see these at:
> > >
> > > http://www.astrophoto.com/7331.htm
> > >
> > > and:
> > >
> > > http://www.astrophoto.com/7331CU.htm
> > >
> > >      Tonight I am taking the LAST images of this galaxy in an attempt to
> > repeat last night's results... then I will have four really good negs to
> > work from. This has been a real learning experience...
> > >
> > >       Tony
> > >
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> > >
> >
> >
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> 
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> 



Mike Cook, AF9Y
http://www.webcom.com/af9y
mwcook@cris.com




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