Making Every Pixel Count

CCDStackRegistration• Uses Get Close First Philosophy1. Roughly align images‣ If images have no rotation, use FFT to align them (first) followed by the starsnap procedure. Alternatively, you can produce the rough alignment using theMANUAL option.‣ If images have a rotational term greater than ½ degree, roughly align themusing the MANUAL mode.‣ I recommend that a “rough” alignment is within a few degrees (1 or 2) and starsalign to within 10-20 pixels.2. Star Snap‣ For images without rotation, select reference stars either manually or using theauto selections feature. Then align this/all.‣ For images with rotation, select two stars near to one another (perhaps a 100pixel seaparation). The second star (and last star in the final star snap) definesapproximate center of rotation. Since this will generally be in the center of thefield, perform this procedure near the middle of the image. These two stars helpCCDStack determine the rotation. CCDStack will attempt to use the same roughanswer on other similar images to help you out.‣ Then, once they are close, do a final star snap (using more reference stars).3. Apply