I almost understood what you are talking about David and that scares me. lol

I also understand the need to challenge the noggin; reason I took up retouching and digital art a decade ago.

Found out that samj had a beta version of 1.5.1.6 that she compiled yesterday so just tried the Pseudogrey option. Not actually getting 1786 tones though, but played with some of the sliders and got 1780. lol

Still, very cool that G'MIC can Pseudogrey too. Updated the tutorial thread links to include this as well David and thanks a heap.

So, I wanted to play around at the pixel level with this method to consider extending the encoding even further. I'm SUPER lazy, so I just went ahead and wrote it up as javascript.

Javascript PseudoGrey Converter

It currently does what I call "base" pseudogrey conversion - meaning that any RGB value can only shift by 1 to give 6 tones between integer tones of greyscale (1786 total tones).

It's using html5 canvas elements - so it will only work in modern browsers that support it.

Also - it DOES NOT upload your image anywhere. It just loads it up in your browser locally and does the encoding on your own machine.

Due to browser limitations, if your image is large (there is not limit on how big it can be - just the encoding time will increase linearly) you will not see a Right-Click -> Save As... option. In that case, Right-Click -> Copy Image - then paste it from clipboard directly into GIMP.

Cool stuff again, Pat; I'll add the javascript to my tut thread as a link. Since I don't browse using an html5 compatible browser, I'll have to let others share their experiences with it. lol

Is Color Cube Analysis an accurate count of Pseudogrey?

Another look at 1786 True Pseudogrey gradient.

Yet another cool way to count colors. Assuming the gradient that you created was straight black to white. Cool that if done right, it gives you the 1786 tones per the Pseudogrey specs. Might try the color cube analysis the next time I do a Pseudogrey odinbc.

Where can I get this plugin odin; thought I had this one, but color cube in GIMP (thought the name was different; lol) is not the same.

MV's Plugins the Wire Worm guy.
http://www.vicanek.de/

I used your gradient from here,
viewtopic.php?f=10&t=4245#p52399

Thank odinbc; the plugin works great in GIMP too which is cool (haven't tried wireworm yet but remember the thread where many here touted its coolness. lol). Did a comparison and you can see that the color band is wider then then straight desat version.