I re-read the following:
A light bulb went on, and I realised I’d been completely wrong in the way I was scaling my Red, Green and Blue images before combining them. This also meant that the Gaussian Blur step was not needed.
What I needed to do to with the colour channel images I made from my initial 720 x 576 images was to horizontally scale them in The GIMP by following amounts:
- Red to 720 x 0.299 = 215 pixels
- Green to 720 x 0.587 = 423 pixels
- Blue to 720 x 0.114 = 82 pixels
And here it is after using this revised method:
I’m sure I’ll come back to this again, but I’m finding it interesting.