how to invert greyscale values only... leaving colors alone

[Rich Evans <revansx@xxxxxxxxx>]

Hello, Is this the right place to ask a question about special filters in GIMP? If so, I'd love some advice on the following task:

I have an RGB image that is basically a black background with many colorful objects and white text.  --- I'd like to invert the image so that it is a white background with black text but a simple invert inverts the colors in all the colored objects as well. Is there a technique or tool to invert any part of the image that is only a shade of grey? i.e. invert pixeils with a saturation of ~0 (if that is how you say it). I could imagine a filter that does a simple RGB invert for any pixel whose calculated RGB saturation value is below a set threshold. Does this type of tool/script exist?

thanks!
-Rich (revansx)



      
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