Drizzel integration and dithering

[rdryfoos]

Does the amount of the dither (3 pixels, or 10 pixels etc) have any influence on the drizzle integration parameters?  Is it false to conclude that with a larger dither, drizzle integration will be more effective?  If I dither 3 pixels (my norm) and compare it to a drizzle integrated image with dithering of 10 pixels--will there be a difference?

Thanks,

Rodd

[jkmorse]

3-5 pixels, randomly distributed is plenty.  All you do with larger amounts is risk throwing your star off the sensor.  You gain nothing in image quality.

[wimvb]

For DSLR images, dithering at least 12 pixels is recommended. This in order to help remove large scale noise.
In my experience it effectively removes streaks left over after calibration.
I usually set my dithering to 15 pixels in a spiral pattern. Since the effective dither step is never an exact number of pixels, this works fine with drizzle.

[jkmorse]

Good point re DSLRs.  My comments were focused on cooled CCDs.

Jim