alt.astronomy:
When film photography was big the Kodak neutral gray card placed in the
photo was a useful way to check the colors in the resulting print.
Is there a standard gray card or card or electronic file with all
possible mapped colors?
My computer graphics card and monitor can display 255^3 possible color
hues. I use MicroStation CAD, and there is a CAD electronic file that
shows all possible [preselected and numbered] colors that can be
displayed and printed. That is a good reference standard.
To show the subtleties of celestial images a high degree of image
fidelity is needed.
Is there a color sample file available somewhere that shows all possible
displayable colors and grays.
That map would show the maximum number of 255 colors for each of the R,
G, and B hues. Additionally it would show all possibly combinations of
the 255 steps of the RGB colors, and it would also show all possible 255
grays.
That file could be posted, and lurkers and sophisticated imagers alike
could check the performance of their graphics cards, monitors, and
monitor settings. It would be useful for checking the displays of
monitors in the computer stores.
I could make that color map in MicroStation, however, making and placing
in a CAD drawing file the 255^3 color variations requires lots of time.
I would save the file in both the .tif and .jpg file formats. everyone
could download and display the files.
Ralph Hertle
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