Starship Asterisk*

I am reading some of the comments on today's APOD. Let me clarify a couple of items. 1. In the Hubble Palette image the NB filters are assigned as follow. H=green, S=red and O=blue. 2. The Hubble Palette image is a starless tone map with a luminosity layer produced from the H image with some contrib...

The Fireworks Galaxy, NGC 6946, HaLRGB
Copyright Eric Coles and Mel Helm

This is a narrow-field image of the Cocoon Nebula, IC 5146. It started out as an SHO Hubble Palette narrowband image. You don't see Hubble Palette images of the Cocoon, probably because of visually unappealing color. But with the addition of RGB stars and several layers of color also from the RGB im...

This is a hybrid image. The RGB image shows nicely colored stars, but very little background nebulosity. Adding H-alpha as a red layer using the Bob Franke technique, brings out the hydrogen emissions and addition a blue O3 layer brings out the oxygen emissions. The result is a more interesting then...

The Soap Bubble Nebula, Hubble Palette Tone Mapped SHO image.
Copyright Eric Coles and Mel Helm

This is a hybrid image generated from a Tone Mapped Hubble Palette image, combined with a RGB image enhanced with both H-alpha and O3 narrowband data.
Copyright Eric Coles and Mel Helm