Hi All here my latest tutorial: as from the subject it's about using an H alpha image to enhance HII regions in spiral galaxies.
The method is directly derived from Vicent Peris formula for composition of Narrow band data with broad band ones.
I how you will enjoy
http://www.radice.biz/tutorial-pixinsight/cat-tutorial-eng/85-enhance-galaxy-ha-eng
Anche in italiano
http://www.radice.biz/tutorial-pixinsight/cat-tutorial-ita/82-enhance-galaxy-ha-ita
The method is directly derived from Vicent Peris formula for composition of Narrow band data with broad band ones.
I how you will enjoy
http://www.radice.biz/tutorial-pixinsight/cat-tutorial-eng/85-enhance-galaxy-ha-eng
Anche in italiano
http://www.radice.biz/tutorial-pixinsight/cat-tutorial-ita/82-enhance-galaxy-ha-ita