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Hand-colored image of Mars from Mariner 4.
Encoding quantitative data with color is (sometimes lite ...

Subtleties of Color (Part 1 of 6) : Elegant Figures : Blogs
http://earthobservatory.nasa.gov/blogs/elega.../subtleties-of-color-part-1-of-6/

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Hand-colored image of Mars from Mariner 4.
Encoding quantitative data with color is (sometimes literally) a simple matter of paint-by-numbers. In 1964 Richard Grumm and his team of engineers at NASA’s Jet Propulsion Laboratory hand-colored the first image of Mars taken from an interplanetary probe as they waited for computers to process the data.

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<img src="http://earthobservatory.nasa.gov/blogs/elegantfigures/files/2013/08/mars_mariner4_hand_618.jpg" alt="Hand-colored image of Mars from Mariner 4." class="alignnone size-full wp-image-787" height="592" width="618"><br> <em>Encoding quantitative data with color is (sometimes literally) a simple matter of paint-by-numbers. In 1964 Richard Grumm and his team of engineers at NASA&#x2019;s Jet Propulsion Laboratory <a href="http://directedplay.com/first_tv_image_of_mars.html">hand-colored</a> the <a href="http://photojournal.jpl.nasa.gov/catalog/PIA14033">first image</a> of Mars taken from an interplanetary probe as they waited for computers to process the data.</em>