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Re: M31, the fabulous Andromeda Galaxy

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  • Randy Nulman
    Eric, That s interesting! I know I am having some monitor problems, but not sure if it s my color vision or the monitor... Regards, Randy ... the ...
    Message 1 of 17 , Dec 1, 2006
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      Eric,
      That's interesting! <G> I know I am having some monitor problems,
      but not sure if it's my color vision or the monitor...

      Regards,
      Randy


      --- In ccd-newastro@yahoogroups.com, "eja24601" <eja24601@...> wrote:
      >
      > Thanks, Randy. Interesting observation, but... I hadn't updated
      the
      > image yet :) Thanks for the tip on reminding people to refresh
      their
      > browsers if I do update the image.
      >
      > I do have a version where I think I tried toning down some of the
      > extremes. A simple dial-up of green turned this up:
      >
      > http://members.nuvox.net/~on.aunt/DSO/M31_LRGB6Small.jpg
      >
      > Eric
      >
      > --- In ccd-newastro@yahoogroups.com, "Randy Nulman" <rj.nulman@>
      > wrote:
      > >
      > > Hi Eric,
      > > Just looked at the image. At first, it still looked a bit
      magenta,
      > > but after doing a "refresh", it's looking very nice...even
      seeing
      > > some hints of HII regions. (Perhaps you should remind people to
      > > refresh their browser if you do a re-process with the same file
      > > name.) Bottom line is that I like what you did on
      this "difficult"
      > > object!
      > >
      > > To answer (hopefully) one of your questions, if you display all
      the
      > > histograms, you should be able to view the black point number as
      > you
      > > select each channel. If they match, then your background is
      almost
      > > guaranteed to be neutral (with exception of any gradients or bad
      > > flat issues)...Caveat, since I'm just getting back into the
      swing
      > of
      > > things, someone please correct me if the above statement is
      > > incorrect.
      > >
      > > Kudos,
      > > Randy Nulman
      > > http://rc20.stonehenge-obs.com
      > >
      > >
      >
    • lknoll1234
      A quick one .... what is the s in sRGB ??? ... most ... other ... decent start. ... I ... will ... in ... this ... to ... this ... a ... is to ... method ...
      Message 2 of 17 , Dec 1, 2006
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        A quick one .... what is the 's' in sRGB ???



        --- In ccd-newastro@yahoogroups.com, Yahoo - Wodaski <yahoo@...>
        wrote:
        >
        > I set the color space to sRGB for anything that will go on the web.
        > (Edit | Color Settings in Photoshop). This is the color space used
        most
        > commonly on monitors. There are other color settings for print or
        other
        > purposes.
        >
        > This can be a very deep area, but working in sRGB gives you a
        decent start.
        >
        > Ron
        >
        > eja24601 wrote:
        > > Thank you very much Dean, Guido, Bud and Ron!
        > >
        > > Ron,
        > >
        > > Thanks very much for your very detailed and informative response!
        I
        > > have yet to fully digest the details of your analysis (and it
        will
        > > probably take me a few passes of it, along with working the image
        in
        > > PS to fully grasp it), but I thought I'd share a bit more about
        this
        > > image.
        > >
        > > I had a few more challenges with this images, namely with respect
        to
        > > the TIFF-to-JPEG translation. On converting the TIFF version of
        this
        > > image to JPEG, the image suffered a loss of saturation as well as
        a
        > > shift in the color balance. My current remedy to this situation
        is to
        > > process the JPEG after the conversion. I currently use freeware
        > > (IrFanView) for these adjustments. Which, while it has a great
        method
        > > of saving JPEG's with good compression and little loss of
        quality,
        > > has a much slimmer tool set than PhotoShop.
        > >
        > > Long story short, the version I posted was adjusted in
        IrFanView.
        > > IIRC, after JPEG conversion the original image got desaturated
        and
        > > blue-shifted. My clumsy fix in IrFanView was to boost the red
        > > slightly and increase saturation overall. This is what probably
        led
        > > to the magenta cast of the final image.
        > >
        > > So, one question from all this is, what can I do to make sure
        that
        > > when I convert my TIFF's to JPEG's, that they will retain the
        > > original color and saturation of the image without my having to
        > > kludge a fix in some other software? FWIW, I work in the Adobe
        RGB
        > > (1998) profile and 16-bit mode. Usually, I convert to 8-bit and
        sRGB
        > > IEC61966-2.1 before converting to JPEG. This has been hit-or-miss
        for
        > > me - this M31 has actually been the biggest miss of the
        conversion.
        > >
        > > One other question: what is the best way to make sure that my
        black
        > > points are aligned? I have the "All Channels View" selected, but
        it's
        > > kinda hard to eyeball the alignment of the black points from
        there.
        > > Is it as simple as switching the "Channels" combo (currently RGB)
        > > to "Colors"?
        > >
        > > Thanks again!
        > > Eric
        > >
        > >
        > >
        > >
        > >
        > > Yahoo! Groups Links
        > >
        > >
        > >
        > >
        >
      • Yahoo - Wodaski
        standard RGB. See: http://en.wikipedia.org/wiki/SRGB Ron Wodaski
        Message 3 of 17 , Dec 1, 2006
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          "standard" RGB. See:

          http://en.wikipedia.org/wiki/SRGB

          Ron Wodaski

          lknoll1234 wrote:
          > A quick one .... what is the 's' in sRGB ???
          >
          >
          >
          > --- In ccd-newastro@yahoogroups.com, Yahoo - Wodaski <yahoo@...>
          > wrote:
          >
          >> I set the color space to sRGB for anything that will go on the web.
          >> (Edit | Color Settings in Photoshop). This is the color space used
          >>
          > most
          >
          >> commonly on monitors. There are other color settings for print or
          >>
          > other
          >
          >> purposes.
          >>
          >> This can be a very deep area, but working in sRGB gives you a
          >>
          > decent start.
          >
          >> Ron
          >>
          >> eja24601 wrote:
          >>
          >>> Thank you very much Dean, Guido, Bud and Ron!
          >>>
          >>> Ron,
          >>>
          >>> Thanks very much for your very detailed and informative response!
          >>>
          > I
          >
          >>> have yet to fully digest the details of your analysis (and it
          >>>
          > will
          >
          >>> probably take me a few passes of it, along with working the image
          >>>
          > in
          >
          >>> PS to fully grasp it), but I thought I'd share a bit more about
          >>>
          > this
          >
          >>> image.
          >>>
          >>> I had a few more challenges with this images, namely with respect
          >>>
          > to
          >
          >>> the TIFF-to-JPEG translation. On converting the TIFF version of
          >>>
          > this
          >
          >>> image to JPEG, the image suffered a loss of saturation as well as
          >>>
          > a
          >
          >>> shift in the color balance. My current remedy to this situation
          >>>
          > is to
          >
          >>> process the JPEG after the conversion. I currently use freeware
          >>> (IrFanView) for these adjustments. Which, while it has a great
          >>>
          > method
          >
          >>> of saving JPEG's with good compression and little loss of
          >>>
          > quality,
          >
          >>> has a much slimmer tool set than PhotoShop.
          >>>
          >>> Long story short, the version I posted was adjusted in
          >>>
          > IrFanView.
          >
          >>> IIRC, after JPEG conversion the original image got desaturated
          >>>
          > and
          >
          >>> blue-shifted. My clumsy fix in IrFanView was to boost the red
          >>> slightly and increase saturation overall. This is what probably
          >>>
          > led
          >
          >>> to the magenta cast of the final image.
          >>>
          >>> So, one question from all this is, what can I do to make sure
          >>>
          > that
          >
          >>> when I convert my TIFF's to JPEG's, that they will retain the
          >>> original color and saturation of the image without my having to
          >>> kludge a fix in some other software? FWIW, I work in the Adobe
          >>>
          > RGB
          >
          >>> (1998) profile and 16-bit mode. Usually, I convert to 8-bit and
          >>>
          > sRGB
          >
          >>> IEC61966-2.1 before converting to JPEG. This has been hit-or-miss
          >>>
          > for
          >
          >>> me - this M31 has actually been the biggest miss of the
          >>>
          > conversion.
          >
          >>> One other question: what is the best way to make sure that my
          >>>
          > black
          >
          >>> points are aligned? I have the "All Channels View" selected, but
          >>>
          > it's
          >
          >>> kinda hard to eyeball the alignment of the black points from
          >>>
          > there.
          >
          >>> Is it as simple as switching the "Channels" combo (currently RGB)
          >>> to "Colors"?
          >>>
          >>> Thanks again!
          >>> Eric
          >>>
          >>>
          >>>
          >>>
          >>>
          >>> Yahoo! Groups Links
          >>>
          >>>
          >>>
          >>>
          >>>
          >
          >
          >
          >
          > Yahoo! Groups Links
          >
          >
          >
          >
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