Late I know! I never was on time with assignments anyway!
Thanks to Tesco's Photo processing for producing green images & making more work for me!:er:
Subject "North American Nebula" (NGC 7000)
Step 1 - The original scan 2332 X 3538 pixels @ 600 DPI (24MB File)
Step 2 - Apply uneven field gradient to even out image brightness
Step 3 - Apply colour gradient to even out colour
Step 4 - Adjust levels and set new black level
Step 5 - Adjust curves in Nebulosity region to bring out nebula
Step 6 - First crop, Saved as reference image
Step 7 - Second crop, saved as subject "North American Nebula"
Step 8 - Apply Minimum filter and blur to reduce star bloating
Step 9 - De-speckle and sharpen to give final image