[Author Prev][Author Next][Thread Prev][Thread Next][Author Index][Thread Index]
RE: Re: [APML] 7331 (again!)
My personal preference would be do leave a judgement of which images are "better" up to the eye of the beholder.
Lee Dodge
San Antonio, Texas
"Robert Gendler" <robgendler@worldnet.att.net> wrote:
>Bobby,
>You make some very good points. There are some I disagree with
>however. There are HII regions in the CCD image that aren't even
>resolved in Tony's image. Contrast does *NOT* equal detail or resolution.
>In Tony's image the contrast has been dialed up to accentuate the dustlanes
>but again contrast is no substitue for resolution. The detail in the
>dustlanes
>of the CCD image are far superior to that in the film image. Also there's no
>blurring
>at all. The smoothness of the CCD image is solely due to high S/N from
>close to 4 hours of exposure time for the luminance. Tony's image is very
>grainy close up
>because of the relatively poor S/N compared to the CCD image.
>Regards
>Rob Gendler
>Email: robgendler@att.net
>Web site: http://robgendler.astrodigitals.com
>
>----- Original Message -----
>From: "Bobby Middleton" <bobm@koyote.com>
>To: <astro-photo@seds.org>
>Sent: Saturday, September 22, 2001 10:15 AM
>Subject: Re: [APML] 7331 (again!)
>
>
>> 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
>> > >
>> > > -- APML Archives at <http://astro.umsystem.edu/apml/> ---
>> > > Unsubscribe at <majordomo@seds.org>
>> > >
>> >
>> >
>> > -- APML Archives at <http://astro.umsystem.edu/apml/> ---
>> > Unsubscribe at <majordomo@seds.org>
>>
>>
>> -- APML Archives at <http://astro.umsystem.edu/apml/> ---
>> Unsubscribe at <majordomo@seds.org>
>>
>
>
>-- APML Archives at <http://astro.umsystem.edu/apml/> ---
> Unsubscribe at <majordomo@seds.org>
>
__________________________________________________________________
Your favorite stores, helpful shopping tools and great gift ideas. Experience the convenience of buying online with Shop@Netscape! http://shopnow.netscape.com/
Get your own FREE, personal Netscape Mail account today at http://webmail.netscape.com/
-- APML Archives at <http://astro.umsystem.edu/apml/> ---
Unsubscribe at <majordomo@seds.org>