ja ostatnio testowalem ten sposob i nie daje halo wokol gwiazd
http://www.rc-astro.com/resources/index.html
Ha/RGB ProcessingThis is my current flow for combining H-alpha and RGB or LRGB images.
Start with well-processed H-alpha (as grayscale) and RGB images. Process each separately at first. Register the two images. Convert the H-alpha image to RGB. Delete (make black) the green and blue channels. Select all, copy, and paste this red image onto the RGB image. Change the blend mode on this layer to "lighten." Adjust the histogram (mainly gamma) of the H-alpha layer to bring its brightness up a bit (gamma ~1.3). Flatten this image. Select all, copy, and paste this image onto the original grayscale H-alpha image. Change the blend mode to "lighten." Flatten this image. Select all, copy, and paste this image onto the RGB+H-alpha image. Change the blend mode to "luminosity." Change the opacity to ~50%. Season to taste.
ten rowniez jest bez halo. najistotniejsze jest tu uzycie screen.
http://astropolis.pl/topic/55888-ngc1499/?p=647250