SH2-129 And Ou4 Nebulae

This picture was processed from 20 hours of SHO data from the SPA-1 CMOS system. Ou4 was very challenging to process, as it appeared only on OIII data and was barely visible from the background. The image was initially processed as HOO to show the nice contrast in colours between the two nebulae. As the SII data was quite strong, I thought it would be a shame to not use it. Therefore, I gave it a yellow colour through NBColorMapper and added it to the HOO picture with ImageBlend. Adding SII data as yellow colour turned SH2-129 into a kind of fireball.