Andrew Burwell September 9, 2018 Mac Astronomy Software, Tutorial, Processing Tutorial Tutorial for Astro Pixel Processor to calibrate and process a bi-color astronomy image of the Veil Nebula Andrew Burwell September 9, 2018 Mac Astronomy Software, Tutorial, Processing Tutorial I walk through the process of calibration and image stacking, then show you how to combine your filter images for a bi-color image in Astro Pixel Processor.