Invert hue option.. Can it be brought back?

[jccr]

Nocturne used to have this feature that not only inverted the screen, but it also let you invert the color hues. For those that didn't know about this: Blue colors became orange colors when the screen was inverted, but with the invert hue option everything stayed dark but orange became blue again for example.

Can this feature be implemented again for 10.9?

[amitmarkel]

Please bring this option back - Hue inversion was the reason I'd used this application extensively.

[ylluminate]

A big +1 here as well. That is exceptionally necessary for this app as I prefer to see colors as they originally were -- or as close to them as possible vs what we presently have.

[ejwessel]

I hope I'm not hijacking this thread to a different area, but I as well have been in pursuit to bring back the invert hue option. There was some talk of this on the blacktree-nocturne forum here There was some speculation that "hue inversion was relying on a private API that may have changed."

If anybody has any ideas please share!

[amitmarkel]

Yes, I think I'd seen that. That feature was very important to me, so now I don't have real use for this program (yet). I wonder why Apple did not incorporate a similar option.

On Oct 22, 2014, at 5:43, ejwessel notifications@github.com wrote:

I hope I'm not hijacking this thread to a different area, but I as well have been in pursuit to bring back the invert hue option. There was some talk of this on the blacktree-nocturne forum here https://code.google.com/p/blacktree-nocturne/issues/detail?id=63 There was some speculation that "hue inversion was relying on a private API that may have changed."

If anybody has any ideas please share!

— Reply to this email directly or view it on GitHub https://github.com/lswank/Tranquility/issues/9#issuecomment-60029152.

[jccr]

I've done some research and I believe we might be able to achieve a similar effect with a highly customized ICC display profile. One that inverts the white point and black point and messes with the gamma levels. I have no idea as to how to actually create this profile, and have not found any "ICC profile editing" tool that specialized yet.

[amitmarkel]

Interesting, never thought about that direction. I think I encountered such an editor on the internet a few years ago; so it might be worth a search.

[amitmarkel]

Perhaps one can attempt to edit their default/retina display profile at /Library/ColorSync/Profiles/Displays with the builtin property editor.

[ylluminate]

:+1: Very good suggestion. It would be an enormous asset for this to have such a feature.

[jbenet]

+:100: Hue inversion is the main only real reason to use Nocturne Tranquility. I will pay for this feature.

[jbenet]

I just set a $50 on bountysource, because i want my greens to stay $@%&ing green. https://www.bountysource.com/issues/3167101-invert-hue-option-can-it-be-brought-back I recommend others who care about this issue to back it too. Whoever fixes this will deserve it, and it may get it to us sooner at all. (cc @kzsh - if you fix it on the original repo, i'll pay it there)

Hurry, Obi Wan Kenobi. You're my only hope. My computer now feels horribly unfamiliar and hostile.

[kzsh]

I spent some time looking into this for Nocturne. I agree with @JCCR that one solution would be a custom ICC profile, though, like him, I don't know how to do that. It's also possible that there's a filter we could use.

[jbenet]

@JCCR @kzsh can we figure something out together? Do we know anyone who knows ICC profiles?

[jbenet]

http://apple.stackexchange.com/questions/8374/white-on-black-without-inverting-colors?rq=1

[ylluminate]

That is a very interesting find there @jbenet. Any luck playing around with these two options?

[jbenet]

@ylluminate not yet :( -- i dont have the bandwdith to sink into and figure out how to edit / make ICC profiles.

[amitmarkel]

A filter which does inversion and hue inversion is easy to do, but it cannot be applied to a color profile I think.

[ejwessel]

I've been watching videos and reading a bit about how ICC profiles work and can be edited. I do have to say they aren't trivial(like the link above this mentions). Given that I'm no color expert and I'm assuming nobody else here is, I was entertaining the idea of purchasing, or better yet using, an ICC profile generator. Though that wouldn't solve the problem of how to get what we want it might be a step closer. Thats all I have for now. I'm going to go back to reading.

http://www.color.org/opensource.xalter

[jbenet]

@ejwessel have you found a good ICC generator?

We should find someone who knows ICC profiles well. Anyone have any leads?

[ejwessel]

I haven't tried any of the open source ones yet. No leads yet either =/ I do plan to start messing around with them this weekend, but we'll see what my schedule allows for =P

[amitmarkel]

I have managed to edit the standard Color LCD profile's tristimulus values with a hex editor. I think we need to understand how to rotate the projective coordinates values so that either lightness is inverted or the hue values are rotated so that inversion inverts it back.

[amitmarkel]

I almost got it right.

I altered the Color LCD profile as I described here https://dl.dropboxusercontent.com/u/6674137/ICC%20Modification.pdf.

https://dl.dropboxusercontent.com/u/6674137/ICC-img.jpg

[jccr]

@amitmarkel Thanks for looking into the color profiles. This is great stuff but may I ask as to why you removed the links to your icc profile and document? I was looking forward to trying out your modified profile..

[amitmarkel]

I edited the document. The colors' hue values are accurately inverted, but something is wrong with the grays. I suspect that the "Apple display native information > Phosphor values" section might be related somehow. I use the Skype icon for observation.

[jccr]

Oh that's cool. Looking at your screenshot, wow looks like you are getting close.

[amitmarkel]

Here is the profile https://dl.dropboxusercontent.com/u/6674137/Invert%20Hue.icc.

Hopefully someone can resolve the remaining little problem with lightness (I assume). Although the problem doesn't seem to be great, it does affect user experience; it makes the OS look like Yosemite.

[amitmarkel]

I think I forgot to invert the white point. Will do that tomorrow!

[amitmarkel]

I have been working on this for three days now. Tomorrow I will have limited time to do this. I hope that this will resolve the issue I mentioned.

[jbenet]

@amitmarkel this is a great step forward! thank you

(for others, install profile in /System/Library/ColorSync/Profiles)

I'm getting these.

• Do you need to reboot / reboot apps (didnt think so... should be system-wise)? some colors in browsers remain uninverted (note the Green github "Comment" button). Is this whitepoint related?
• Yep, i also note the grays + lightness problem (not quite smooth enough to be usable, but we're getting there)

just hue

with nocturne

[amitmarkel]

I suppose so. Will fix it tomorrow.

[ejwessel]

@amitmarkel Great job! Fantastic write up including references.

[dmitrym0]

The profile needs to go to ~/Library/ColorSync/Profiles in Yosemite. I had to create it (upgraded from Mavericks).

[amitmarkel]

I don't notice a difference when inverting the media white point.

https://dl.dropboxusercontent.com/u/6674137/Invert%20Hue2.icc

How does it look on OSX 10.10?

[amitmarkel]

Another attempt https://dl.dropboxusercontent.com/u/6674137/Invert%20Hue3.icc

Rotated - https://dl.dropboxusercontent.com/u/6674137/Invert%20Hue.icc Rotated as well as white point - https://dl.dropboxusercontent.com/u/6674137/Invert%20Hue2.icc Almost rotated - https://dl.dropboxusercontent.com/u/6674137/ICC_Almost_Rotated_Tristimulus.icc

I'm still not sure what is wrong. Also I made lots of "redundant" computations from theory, but these can be done via the ColorSync Utility's calculator.

What I have done was this: I converted each XYZ point of the color tristimulus (red, green, blue, white) to its HSV representation (Hue Saturation and Value). Then I took the HSV point and changed its Hue value into (Hue+180) mod 360. Then I calculated back as XYZ. Now, the ICC profile's point's coordinates are inputted as whole numbers and I figured what the relation is: multiply, say the X coordinate of an XYZ point, by 2^16. (and vice versa: divide a coordinate in the binary by 2^16).

In photoshop, this works -- representing every XYZ color in HSV and then rotating it by 180˚ in hue. For an original image https://dl.dropboxusercontent.com/u/6674137/ICC_output%20original.png its transformation looks exactly like this https://dl.dropboxusercontent.com/u/6674137/ICC_output%20invert%20hue.png and so when colors are inverted it looks exactly like this https://dl.dropboxusercontent.com/u/6674137/ICC_output%20invert%20hue%20invert%20colors.png.

However, I still have one more idea to try.

[amitmarkel]

I haven't succeeded in rotating it in 180˚ in hue and having it being correct, but I gathered all the resources I learnt from as well as the results and my additional explanations on how to compute the values and how to input them into an ICC binary correctly here: https://www.dropbox.com/sh/hf2tnaugskcnaey/AAACZ8sfC5IM_Y3-xXXROsA9a. (Note: I do not intend to delete this folder.)

Instead of taking the Digital Image Processing I at the Technion university, I have just quickly learnt some portion of it in a few days :) -- perhaps if I'd taken the course, I would have understood this topic better, but I have already taken more points than needed to graduate and focused more on computer security.

Hopefully someone can figure out why everything "breaks down" when rotating by 180˚ on displays; perhaps it is not possible? (I certainly do not hope so of course)

Good luck.

[ejwessel]

@amitmarkel I'll be looking over your work. Thank you for all the time you've spent on this.

[jccr]

@amitmarkel Thank you for getting us this far, and for sharing everything you have learned.

[kzsh]

@amitmarkel Seconded! Thanks for this excellent work! And thank you for sharing it with us.

[jbenet]

@amitmarkel yeah, really great work!! this gets us very far!!

Do we know anyone with color theory and/ors OS X color expertise who can help figure out these last hue inversion problems?

[ejwessel]

Organized Data for easy viewing

Amit's work is definitely correct.

As for the browser issue(I'm using Chrome) it appears when I change to the inverted hue, it changes for a split of a second and then immediately changes back regardless of the .ICC profile loaded. I'm looking into this.

Edit: The browser issue only happens for me in Chrome.

[ejwessel]

As for the browser issue it seems that Chrome and Firefox do not support ICC Version 4. Safari does however. You can test your browser here

[jbenet]

This is disheartening:

The previous version supported ICC Version 2 and Version 4 profiles for colour management on OSX. Version 22.0.1229.79 has dropped support for version 4.

2 years ago: http://www.reddit.com/r/chrome/comments/10o42b/chrome_22_osx_drops_icc_version_4_support/

Also: https://code.google.com/p/chromium/issues/detail?can=2&start=0&num=100&q=&colspec=ID%20Pri%20M%20Iteration%20ReleaseBlock%20Cr%20Status%20Owner%20Summary%20OS%20Modified&groupby=&sort=&id=162661

Looks like we should make a Version 2 profile

[jbenet]

@ejwessel wait, aren't these profiles Version 2?

[jbenet]

Also, not just browsers. See the text difference below (this is profile + nocturne)

[amitmarkel]

Btw, Nocturne is not needed at this point for testing, CMD+CTRL+ALT+8 may be used to just invert colors. (might be required to enable this keyboard shortcut on Yosemite, I still have Mavericks).

[jbenet]

@amitmarkel nocturne removes shadows :)

[amitmarkel]

@jbenet oh right, but I still got used to the inverted shadows :)

[ejwessel]

@jbenet Nice catch. You are correct, we are using v2.0+ so perhaps thats not the issue. Which app is that btw? What other apps aren't inverting either?

[amitmarkel]

I located this file: /System/Library/Colors/Apple.clr/Apple.clr which is encoded in plaintext and looks like this:

11 0 0.0 0.0 0.0 1.0 Black 0 0.0 0.0 1.0 1.0 Blue 0 0.6 0.4 0.2 1.0 Brown 0 0.0 1.0 1.0 1.0 Cyan 0 0.0 1.0 0.0 1.0 Green 0 1.0 0.0 1.0 1.0 Magenta 0 1.0 0.5 0.0 1.0 Orange 0 0.5 0.0 0.5 1.0 Purple 0 1.0 0.0 0.0 1.0 Red 0 1.0 1.0 0.0 1.0 Yellow 0 1.0 1.0 1.0 1.0 White

Perhaps this file (and maybe the two others shown in the screenshots below) may be altered to achieve something.

[dmitrym0]

Hello friends, any updates on this?

I'm volunteering myself as a guinea pig :)

[amitmarkel]

There's something I noticed today. I have a malfunctioning nvidia on a 2010 mbp, which I tried to disable by pulling out every nvidia-related kext (kernel extension driver).

We noticed that the grays were not accurate when these profiles were applied (neglect the hue inversion), and so they were, similarly, when I unloaded the drivers. I'm not sure if this can help, but I did notice this.

One may try this as follows: Navigate to /System/Library/Extensions/ and move out any "NVDA.kext", "GeForce.kext", "NV*.kext" files into a different folder, download and run KextUtility, and then reboot. Note that the login screen gets blank (black) so set up an automatic logon temporarily, or press DOWN and then ENTER and then type your password and then ENTER again; like I did. :) To revert, simply: move the files back, run KextUtility, and then reboot. Disable automatic logon if you like. I used KextUtility to rebuild the extensions' cache to force changes.