President Elect, The Mechanic wrote on Dec 26
th, 2017 at 5:11pm:
Quote:Are the colors in Hubble images real?
There are no "natural color" cameras aboard the Hubble and never have been.
The optical cameras on board have all been digital CCD cameras, which take images as grayscale pixels.
dear Mechanic,
The Hubble often takes pictures using filters for Hydrogen Alpha, Oxygen 3 & Sulfur 2.
These are mapped to Red Green & Blue.( called RGB )
However the Hubble can take pictures with Red, Green & Blue filters
to give the true colours of the target.
Your home cameras do the same thing with RGB.
The pictures are taken from the camera chip as monochrome
in what's called a 2x2 Bayer matrix.
In a matrix of 2x2 there are 2 green filtered pixels for each Red & Blue pixel.
A monochrome sensor has 4 times the resolution of a Bayer matrix.
https://en.wikipedia.org/wiki/Bayer_filter