Re: Is this the real earth?

Chris L Peterson wrote:

On Fri, 23 Nov 2007 03:46:24 GMT, "Buffalo Gump" <buff@xxxxxxxxxx>
wrote:

This image was taken using ORANGE green and blue filters. What happened to RED green and blue? (RGB)

There's nothing special about RGB. It certainly doesn't do a very good
job matching human color response (which is most certainly not based on
RGB).

This overshoots the mark, possibly because it's a response to the OP's
attitude rather than the substance of the question.

RGB is not arbitrary. It is, in fact, based on human color perception,
which is why RGB primaries are the nearly universal choice for additive
color systems: RGB provides the widest gamut, the triangle covering the
most territory on the CIE chromaticity diagram.

More on-topic, a lot of "true color" space imagery simply isn't, and I
think this is worth pointing out. In some cases it might even have
scientific significance.

Compare the image the OP is talking about to an image from OrbView-2/
SeaWiFS, both showing Australia.

http://www.esa.int/esaSC/SEMRYE63R8F_index_0.html
http://veimages.gsfc.nasa.gov/869/S200023802.jpg

Not sure to what extent the choice of primaries has contributed to the
difference, but obviously *something's* going on.

- Ernie http://home.comcast.net/~erniew
.