Specifications

Illustration 17: The dark frame

corresponding to the above raw image

Illustration 18: The raw image with

subtracted dark frame

Subtraction of the dark frame eliminated majority of thermal noise, but

unevenly illuminated field is still obvious. Image center background is

much brighter than the border parts.

Illustration 19: Flat field represents the

telescope/camera response to uniformly

illuminated fiel

Illustration 20: Fully calibrated image

with dark frame subtracted and applied

flat field

CCD image calibration is described in detail in the SIPS User's Guide.

Refer to the “Introduction to CCD Imaging” and “Calibrate Tool” chapters

for calibration description in theory and in practice.

Color Images with monochrome camera and

filters

Color images are definitely more appealing than black and white ones. It is

also easier to gather more information from color images – for instance it is