May I suggest that the reason that green is used for night lighting isnt so much the eye sensitivity, tho that IS true. It has to do with persistance of vision. Green can be easily seen at night while preserving your night vision. Brighter colors like yellow kinda mess-up your night vision. Green is more "friendly" to your night vision. Some car instrument panels (speedometer, etc) are lit in yellow. While that is easier to see it is hard on your night vision. This may not be true for everybody, but it is generally true for most people.

In reply to Re^3: convert image to greyscale (color to black and white) by Razorbeard
in thread convert image to greyscale (color to black and white) by PodMaster

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.