Custom Compiz color filter

[Michl0x07]

Wow, the documentation on this is intense.
I am not sure if this coincides with night vision BUT when blue light hits your eyes it basically tells your brain not to produce melatonin. I have been using blue blockers sunglasses (remember those?) at night to use my computer to not mess up my sleep. The white in the text using the above filters has to much blue light in the white.

Exactly! I need it for the same purpose as you!

I experimented a bit, and here it is:

!!ARBfp1.0
TEMP tex, temp;
TEX tex, fragment.texcoord[0], texture[0], RECT;
DP3 temp.r, tex, {0.9, 0, 0, 0};
DP3 temp.g, tex, {0, 0.9, 0, 0};
DP3 temp.b, tex, {0, 0, 0, 0};
MOV temp.a, tex.a;
MOV result.color, temp;
END

Melatonin, you can come!

[Nikles]

Is there a way to conditionally use a negative filtered color only if the overall light intensity is lower than the original one?

The Problem


With a dark color scheme, the dark areas (which would be quite OK as they are...) becomes incredibly bright.
This is a nightmare for working up late at night.

Shader Assembly Language (ARB/NV)
I've found this link as a reference for creating filters: http://www.renderguild.com/gpuguide.pdf

...but I really can't get mine working.

Possible solutions could involve:

Instruction   Output  Input     Description 
-----------   -----  ------     -----------
LIT           v       v         compute light coefficients
SGE           v       v,v       set on greater than or equal
SLT           v       v,v       set on less than
MAX           v       v,v       maximum 
MIN           v       v,v       minimu

I'll try again but if anyone else comes up with a viable solution... well... post it here please (maybe with screenshots too)

[Nikles]

Haven't found a solution yet.
Has anyone else tried to solve the issue?

[oldarney]

Thank you!

I'm working on a skin filter, to make skin only turn inverted.

Edit: after alot a work, i found that inverting skin would ruin some text with anti alias.
so instead I made skin gray. you can find the filter here:

http://malefreedom.blogspot.com/2011...inux-beta.html

Never mind solved adding to startup a scrip with the following code

#!/bin/bash

sleep 20s && dbus-send --type=method_call --dest=org.freedesktop.compiz /org/freedesktop/compiz/colorfilter/allscreens/toggle_screen_key org.freedesktop.compiz.activate string:'root' int32:`xwininfo -root | grep id: | awk '{ print $4}'` &

I'm working with a fake RGBA color filter:

!!ARBfp1.0
TEMP texv, rep;
TEX texv, fragment.texcoord[0], texture[0], RECT;
MOV rep, {0.196078431, 0.196078431, 0.192156863};
SUB rep, rep, texv;
ABS rep, rep;
MAX rep.b, rep.b, rep.r;
MAX rep.b, rep.b, rep.g;
SUB rep.b, rep.b, 0.0001;
CMP rep.b, rep.b, 0.9, 1;
MUL texv, texv, rep.b;
MOV result.color, texv;
END

but I'd like to filter more than 1 color... Is there a way to load more than one filter at once in colorfilter? Or anyone knows how to change the code above to add more colors?

[oldarney]

Exactly! I need it for the same purpose as you!

Melatonin, you can come!

I love the way you are thinking, however, that filter makes everything yellow lol.
Here is one that turns 85% of blue into other colors.

!!ARBfp1.0
TEMP tex, temp;
TEX tex, fragment.texcoord[0], texture[0], RECT;
DP3 temp.r, tex, {1, 0, 0, 0};
DP3 temp.g, tex, {0, 1, 0, 0};
DP3 temp.b, tex, {0.425, 0.425, 0.15, 0};
MOV temp.a, tex.a;
MOV result.color, temp;
END

I also made the oposite, which makes every color bluer, except white. Its like sephia,
but for blue, and leaves colors.

!!ARBfp1.0
TEMP tex, temp;
TEX tex, fragment.texcoord[0], texture[0], RECT;
DP3 temp.r, tex, {1, 0, 0, 0};
DP3 temp.g, tex, {0, 1, 0, 0};
DP3 temp.b, tex, {0.5, 0.5, 1, 0};
MIN temp.b, temp.b, 1;
MOV temp.a, tex.a;
MOV result.color, temp;
END

[jpka]

and maybe that's just me

You're not alone! I was search for exactly this filter for many years. And now, using your solution, i can write big, bold and embossed final point in my journey. Armed with your code, i'm able now fight any non-human-friendly software like most professional CADs and development systems. I was use 'invert' plugin before, but it damage colours.
The only problem i found in your code (i mean first original code) is the colors not so intensive as must be. (But, it is *much* better than wrong colours). Ideally, we must invert image and then turn *hue* value by 180 degrees to get precisely correct colours, please see screenshots here.

Thank you very much for your work and for saving people's eyes! You rock!

[diethr]

Hi,

I've recently been diagnosed with irlen syndrome, a sensitivity to certain wavelengths of light that makes reading very difficult. I'd like to make a color filter that changes the white to a light blue color. I'm not a programmer and so this along with my condition is making learning how to write filters very difficult. I'd really appreciate some help.

I've got some questions:
Are the color codes written in CSV?

I've annotated the color filter below (sepia) to show what I understand so far. Would you mind telling me if I'm wrong and mention anything that I'm missing.

!!ARBfp1.0

//sets temporary variables 'tex' and 'tem'
TEMP tex, temp;

TEX tex, fragment.texcoord[0], texture[0], RECT;

//sets the color value for red
DP3 temp.r, tex, {0.393, 0.769, 0.189, 0};


//sets the color value for green
DP3 temp.g, tex, {0.349, 0.686, 0.168, 0};


//sets the color value for blue
DP3 temp.b, tex, {0.272, 0.534, 0.131, 0};

MOV temp.a, tex.a;
MOV result.color, temp;
END

How would I change the the white to a blue colour given the csv value {0.552500,0.719644, 0.947500, 0}?

Thanks for any help,

Ben.

[jpka]

Hi!
I suddenly did some research and probably find solution that can preserve colors more precisely than original inversion filter. It works perfectly with grays, blacks, whites, and saturated colors. But halftones may be a bit grayed or lighted. Please see comments in code.

Use it and give to your friends. This filter will save your eyes, like lian1238's original filter.

!!ARBfp1.0
# Compiz Color Filter, negative but preserve colors v0.1
# Based on various ideas and examples.
# author of portions: jopka1@gmail.com, www.bdyssh.ru
# (select 'Ruby' in `gedit` for proper text highlight and show of keywords and comments)

TEMP temp, lightness, diff, saturation, delta, grayness;
TEX temp, fragment.texcoord[0], texture[0], RECT;

# saturation 0...1 - show how rich the colour.
#  i calculate it as max difference between r, g, b parts of colour.
#  it is linear operation, so it's incorrect for half-tones, see HSL color model.
# grayness = 1 - saturation. (it is 'anti-saturation').

MOV saturation, 0;
SUB delta, temp.r, temp.g;
MAX saturation, saturation, delta;
SUB delta, temp.g, temp.r;
MAX saturation, saturation, delta;

SUB delta, temp.r, temp.b;
MAX saturation, saturation, delta;
SUB delta, temp.b, temp.r;
MAX saturation, saturation, delta;

SUB delta, temp.g, temp.b;
MAX saturation, saturation, delta;
SUB delta, temp.b, temp.g;
MAX saturation, saturation, delta;

# simple method used... Not sure if it is precisely correct.
MUL lightness, temp.r, 0.333;
MAD lightness, temp.g, 0.333, lightness;
MAD lightness, temp.b, 0.333, lightness;

# -0.5 to 0.5 range and inverse
ADD lightness, -lightness, 0.5;

# -1 to 1 range
MUL lightness, lightness, 2.0; 

# inverse slope - calculate grayness, 1 = not coloured pixel, 0 = full saturation
SUB grayness, 1, saturation;

# here we invert pixels, and amount of inversion is inverse relative of saturation.
# so, black colour become white, white turns to black, but red remains red.
MUL diff, lightness, grayness;

ADD_SAT temp.r, temp.r, diff;
ADD_SAT temp.g, temp.g, diff;
ADD_SAT temp.b, temp.b, diff;

MUL temp, fragment.color, temp;
MOV result.color, temp;
END

[jpka]

Hi!
Ubuntu 12.10 lacks of ColorFilter plugin. Also Neg plugin kicked from mainstream, but installable as separate option via command line.
This plugin was main reason for me to vent from Windows to Ubuntu six yrs ago, and now, latest Ubuntu just can't be used at all, due to lack of it.
But don't let your eyes cry.
I take some weeks and find a way to modify Neg plugin so it can match my color filter processing. So, Ubuntu 12.10 still can be turn to useable. (I can't imagine what else can be worse in 13.04, but it becomes worse each new release, and blind to my bugreports.)

Well, here is the (pseudo-diff of the) code of neg.cpp. You will need to recompile Compiz. It is full of tricks, but doable by inexperienced people like me. Tip: Never do 'make install', else you need to reinstall complete system. Just take libneg.so after build and push it to /usr/lib/compiz/.

// read more at http://ubuntuforums.org/showthread.php?t=1419702&page=2
// was: Compiz Color Filter, negative but preserve colors v0.1
// Based on various ideas and examples.
// author of portions: jopka1@gmail.com, www.bdyssh.ru
static std::string fragment_function =
	"void neg_fragment () {; \n"
	"float lightness; \n"
	"float diff; \n"
	"float saturation; \n"
	"float delta; \n"
	"float grayness; \n"
	"vec3 temp; \n"
// saturation 0...1 - show how rich the colour.
// i calculate it as max difference between r, g, b parts of colour.
// it is linear operation, so it's incorrect for half-tones, see HSL color model.
// grayness = 1 - saturation. (it is 'anti-saturation').
	"saturation = 0.0; \n"
	"delta = abs (gl_FragColor.r - gl_FragColor.g); \n"
	"saturation = max (delta, saturation); \n"
	"delta = abs (gl_FragColor.r - gl_FragColor.b); \n"
	"saturation = max (delta, saturation); \n"
	"delta = abs (gl_FragColor.g - gl_FragColor.b); \n"
	"saturation = max (delta, saturation); \n"
// simple method used... Not sure if it is precisely correct.
	"lightness = gl_FragColor.r * 0.333 + gl_FragColor.g * 0.333 + gl_FragColor.b * 0.333; \n"
// # -0.5 to 0.5 range and inverse
	"lightness = 0.0 - lightness + 0.5 ; \n"
// -1 to 1 range
	"lightness = lightness * 2.0 ; \n"
// inverse slope - calculate grayness, 1 = not coloured pixel, 0 = full saturation
	"grayness = 1.0 - saturation; \n"
// here we invert pixels, and amount of inversion is inverse proportional of saturation.
// so, black colour become white, white turns to black, but red remains red.
	"diff = lightness * grayness; \n"
// WARNING. Originally ADD_SAT instead of ADD used.
// but i don't know its equivalent for fragment function,
// to prevent values run out of 0...1 boundaries. So just add (`plus`) functions used.
	"temp = vec3(gl_FragColor.r + diff, gl_FragColor.g + diff, gl_FragColor.b + diff); \n"
	"gl_FragColor = vec4(temp, gl_FragColor.a); \n"
	"} \n"
;

Hope it helps.

ADD: Please remember to change fonts antialiasing mode from rgb to grayscale via gnome-tweak-tool.

[zombifier25]

Ya know, another option is to stick with 12.04 if you're really dependent on the feature. It has 5 years of support, so you can stick to it until Compiz got all the unsupported plugins sorted out