Hubble Palette Processing in Photoshop

This tutorial shows you how to stretch and combine narrowband (Ha, OIII and SII) monochrome images using Photoshop to produce a Hubble Palette image. While this is basically a Red=SII, Green=Ha, Blue=OIII exercise, there is a special step using Photoshop's Selective Color feature to get the familiar 'green and gold' colours often seen in Hubble Palette images online. The final steps are done using Lightroom. Hope you find it useful. Please go to my website at www.martinsastrophotography.com for more info, imagery and other astrophotography stuff! Clear Skies!