Is that Gimp Desaturate (lightness) as apposed to The Pseudogrey script? If so the palette seems to make a difference.

yeah i just did gimp colors desaturate lightness and then put it next to pseudogrey.
not sure what you mean by pallette

I didn't test I was only guessing that the pseudogrey script uses a larger array (palette) of shades.

A more direct comparison would be to desaturate based on luminosity, in which case the difference between the two results should be barely perceptible.

Sauls spot on here. Lightness uses a different weighting algorithm for each of the RGB components to arrive at a gray value
(1/2 × ( MAX(R,G,B) + MIN(R,G,B) )).

Luminosity uses:
(0.2126 × R) + (0.7152 × G) + (0.0722 × B)
to arrive at a gray level.

Hello, - I just used the pseudogrey script, which is nice...except for some reason at the top of my image I get a band of grey...is it because I'm using jpg. format?

The image is RGB; which pseudogrey script did you use, I seem to recall a script that renders a pseudogrey band like that?

...oops, didn't know there was more than one! Is the newest one in here also? I have this script: patdavid-psuedogrey_0

Pat David's script renders the gradient strip.

Is there any errors being reported when this runs? That strip is usually deleted after being run (you can manually delete the layer the strip is on if needed).

What version of GIMP, and where did you get the script from (so I can test it)?

I'm using True PseudoGray with Gimp 2.8.14. The gradient strip is always on another layer (which works for me), it never auto deletes. No error messages.
For what it's worth here's the Colorcube Analysis, from 3 different source versions of my sample image.

I've attached an old, revised version of the script that should automatically delete the temporary gradient layer. Just drop this into your scripts folder, and it'll be found under the menu "Colors → Pseudogrey..."

Hello Pat (by the way, I am also using gimp 2.8.14)

No errors, I just noticed the strip...and being very new in using the script, did not know you could manually delete the layer to get rid of the strip. The first time I came across this script was on page two of this conversation, I then also tried going to http://registry.gimp.org/node/26515 only to get the same results. However, I made the mistake of not deleting the first script before adding the 2nd from the registry page (because I thought it'd replace it, which it didn't). So I just downloaded the latest script that you've entered on the next page (thank you)...first deleting the other two that were in there.

I really do love the color it produces

Yes!!

The latest script works great...thanks everyone!

Not sure how often Pat frequents here, but was wondering if he had time to update his Script-fu for GIMP 2.10.

It is one of yours that I use.

Fixed it for Gimp 2.9.x sometime ago. Seems to work ok in Gimp 2.10.0

attached:

Thanks, Rich. I did pose this question at Pixls's site and Pat reminded me that G'MIC actually handles pseudo-gray now. Completely forgotten that. lol

I did try your update, Rich and it works great. Thanks for sharing.