A lookup table is then used to map the numeric data to colors on the computer screen. Doing CCD imaging requires a computer to receive the signal from the camera at the time the exposure is taken. Let's first look at the chip. The Chip A chip is made up of rows and columns of pixels. This matrix captures the image.
Resolution is the number of pixels used to represent the desired object.
A good rule of thumb is for each pixel cover 2 arc seconds of sky. This number comes from taking the seeing conditions and dividing it by half. The seeing conditions are defined as the size of a stellar object due to atmospheric conditions, the less stable due to moisture, light pollution or unstable air the larger the object appears. Under normal viewing conditions a star would be about 4 to 5 arc minutes in size. We half that for a rule of thumb on how to size a CCD chip to a telescope.