Originally posted by nasif
Obviously you have never worked with image processing. When you seperate a color image into its component colors, it gets seperated into 3 grey scale images. Its very simple in computer to produce a color image from 3 RGB component grey scale image. They do this all the time in publishing industry with 4 channels CMYK.
Originally posted by Arnab
For the LAST time:
These detectors produce images of the cosmos not in color, but in shades of black and white.
Finished color images are actually combinations of two or more black-and-white exposures to which color has been added during image processing.
I am not saying you're lying. You are just not READING carefully!
Yes, they take the image in grey scale (its not black and white, that is an incorrect term). But they have 3 different grey scale for 3 channels of RGB. From these 3 grey scale image a color picture can be composed. Its as if you have taken a color image. There is no practical difference.
Obviously, you don't seem to understand that space photography as done by Hubble is completely different from normal photography.
Hubble is basically collecting various types of data, some of which is visible, most of which isn't. The scientists are taking these data, which are in binary form and making images out of them.
They are not initially collecting an RGB inage and then seperating the colors. They are taking an image that resembles a grey scale image (but in fact has much more info than that) and then ADDING colors to it to their whim.