For MSB Astroart 3.0 under Windows^TM XP, 2000, Me, 98.
Copyright 1998-2004 MSB Software. All rights reserved.

Version 1.0 for color and b/w images.

To install this plug-in copy the file pisigma.dll into the Astroart directory.

Sigma combine is a way of averaging imaging with automatic rejection of bright and dark points, much powerful than the simple median combine, with a better s/n ratio.
If the images need auto-alignment then before the sigma combine perform a Preprocessing with the option "Save each image", all the images will be aligned and resaved with the prefix "_P".

• Click the menu Tools/Plug-ins/Sigma to open the dialog window.
• Select the files to process.
• After a while the final image will be created and displayed.