True PseudoGrey in GIMP

I was in the process of including my last tutorial on curves in some forum posts around the internet when I visited gimpchat.com again. After I had posted my link I was perusing the tutorials board when I came across user lylejk's post about implementing a true pseudo-grey on images in GIMP.

Randi PseudoGrey (mouseover for desaturated 256 value version)

It was an interesting read, but the thing that started me thinking was the implementation. It was a manual implementation in his tutorial, and I figured I could slap together some script-fu to automate the process.

Getting Around in GIMP - Color Curves Toning/Grading

Color has this amazing ability to evoke emotional responses from us. From the warm glow of a sunny summer afternoon to a cool refreshing early evening in fall. We associate colors with certain moods, places, feelings, and memories (consciously or not).

Book have been written on color, and I am in no ways even remotely qualified to speak on it. So I won't.

Instead I am here today to maybe help shed some light on the use of the Curves tool in GIMP.