The transfer rate of a WebCam requires a lossy
compression to achieve the specified 30fps frame
rate at full resolution. These losses will degrade the image quality
for astro imaging and must be minimized therefore.
the CCD has true 640x480 photosites
but covered by a bayer filter one does disable the
degrading interpolation used for color
CCD chips to let pass the raw image to
the computer. Taking only the Y plane (luminance
channel) one has the least compression applied - rebuilding the color
image on the receiving computer will usually lead to a better final
Using again a clever program ;-) one can disable the cameras de-bayeralgorithm and reduce the
compression as best as possible the which leaves all pixels
un-interpolated pass through up
to the receiving end.