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55770Re: [ccd-newastro] Re: M31, the fabulous Andromeda Galaxy

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  • Yahoo - Wodaski
    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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