The grinding upward struggle to make work quicker, more efficient, finally stopped yesterday.
Just make screenshots.
I worked out that using the colour conversions feature in Irfanview repeatedly, following that by "auto adjust colours" led to some strange, if effective duotones.
However, when the final jpeg was saved, it was full of broken pixels and blotchy skies.
Just snap the chosen image with the Prt Sc button on the keyboard and paste into your favourite photo editor.