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Camera and Display RGB question

  1. Jan 25, 2007 #1
    Hello,

    I have somewhat of a technical question and was hoping you would be able to help me. I have a display that is 852 (x3) x 600. This means that that there are 852 x 600 of the red, blue and green filtered pixels. Say however that I am looking at a completely red object, thus only red light falls on detector, and detected by only red filters. That means only red pixels on display will be on.
    However, if in another case, white light falls and is detected by all three RGB pixels, and on the display as well, all three RGB pixels will be on. Does that mean that for a red object, resolution is effectively decreased by 3 compared to white light?

    I appreciate any input you have!!
     
  2. jcsd
  3. Jan 25, 2007 #2

    russ_watters

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    Staff: Mentor

    It would be if the camera software were capable of outputting 1704x1200 and the color were an even white and the filters had the same bandwidth...

    I was very disappointed when I found out that my MEADE DSI had a 510x492 ccd with a filter grid on it (as opposed to a 1010x984 ccd with a grid and an output of 510x492 in color). They advertise the ccd resolution, not the effective resolution. Incidentally, since the filter grid is 2x2, they double-up on the green. When I get home, I'll post an example image...

    This is why better astrophotos are shot with full-size filters, a monochrome chip, and multiple exposures.
     
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