1. Create preview in background area with no stars or nebulosity.
2. Select this preview as your reference image.
3. If required you can combine multiple previews using the 'PreviewAggregator' script.
4. Open the chosen preview and press 'Alt + N' to enable 'Readout Mode'.
5. Hover the cursor over the preview and find the highest value for any of the channels.
6. Adjust the upper value to be slightly above the value in Step 4 e.g. 0.010
1. For the white preview:
- Structure Detection enabled, select an area with a number of stars.
- Structure Detection disable, select an area with a galaxy in the centre (under the red X).
2. For the background preview:
- Use the same preview from Background Neutralisation.
- Apply background neutralisation to it BEFORE use.
- USe the same upper limit figure as you used in Background Neutralisation.
Use Default settings for normal use, to remove green tint.
For images that contain the authentic teal colour of supernova remnants and planetary nebulae change the Protection method to Maximum Neutral.