Change color hue by code? (not saturation, not brightness)

Hello everyone!
Is there a way to change the hue of a color by code?

Thanks for any ideas,
Greetings,
Shu

 

Most (but not all) materials have a .color property.

Generally you can set this field to any color you want with a call like this, assuming this script is ON the object where the renderer is.

Code (csharp):

1.  gameObject.GetComponent<Renderer>().material.color = new Color( 1.0f, 1.0f, 0.0f); // yellow

 

Thanks for your answer!
I am actually referring to something different, though:
I would like to change hue only, not saturation or brightness.
Basically, I am looking for something like that:

Code (CSharp):

1. Color SomeColor1 = Color.blue;
2.  
3. void Start () {
4. SomeColor1.hue += 60;
5. // SomeColor1 should be pink now, with its brightness and saturation still at 100%
6.  
7. SomeColor1.brightness -= 0.5f;
8. // SomeColor1 should have lost half of its brightness
9.  
10. SomeColor1.saturation -= 0.5f;
11. // SomeColor1 should have lost half of its saturation
12. }

But from what I have read, there is no Color.hue, nor Color.brightness or Color.saturation.
Maybe I have to use Color.greyscale to ship around this problem somehow. But that information only includes brightness. I don't know.

 

Convert RGB to HSV, change it, and convert back.
Theres alot of results on google for this

 

Yes, exactly what @hpjohn said... Unity's Color constructor works in RGB space, you want to traverse the H axis of HSV space...

NOW... there is slightly-cheaper way you can "color bend" materials: when you set the .color property, you are effectively telling the shader to multiply all textures by that color before rendering. If the texture is grayscale, then you are getting a "tint" effect for free.

However, if your texture has more than one color in it, things can get tricky. Red times green is black, red times blue is black, etc. Yellow times Red is red... things like that. Each channel (R,G,B) is multiplied individually.

 

http://wiki.unity3d.com/index.php?title=HSBColor

--Eric

 

I see. Conversion is harder than I thought, though.
The only possibility I find within Unity is this:
http://docs.unity3d.com/ScriptReference/EditorGUIUtility.RGBToHSV.html
But it's for the Editor.
The options presented here aren't very attractive either:
http://stackoverflow.com/questions/359612/how-to-change-rgb-color-to-hsv
Some options seem to not include conversion back.

Thanks! I will check it out.

EDIT:
I guess I cannot take it from there because of "

• Content is available under Creative Commons Attribution Share Alike.

".

 

Why would the Creative Commons Attribute Share Alike license disallow you from using it?

All you have to do is include attribution.

 

I interpreted the second term ( on http://creativecommons.org/licenses/by-sa/3.0/ ) so that I have to distribute any app that includes the script for free, because I got the script for free, too, and I "build upon" the material.
Besides, in my case it's probably quicker to set the values in the Editor by hand than to add menus to all apps that point out the source of the script.
I just thought there might be a quick way to do this in Unity by accessing values directly.

 

The second term was specifically stating you're free to use it how ever you want, for free, no cost to you. Just include attribution.


Also the colour values are just a number in 32-bit ARGB.

ARGB does not directly encode hue.

So yeah, you'd have to convert it. Even if unity gave you a 'hue' property, it would essentially be converting it for you. Because computer graphics devices don't usually work in HSV, they work in RGB.

 

i added the second hsv function version on teh wiki. I done that alot. you can either do it on the shader which is crazy fast, a bit less precise than 32 bit, and 1000 FPS, or you can change materials and textures directly, which can be efficient in some scenarios and is easier than shader and more precise colors, you have to use HSV indeed.

 

@Shushustorm - if you are concerned about authors and what not since you don't really know who wrote that one.

Here:
https://github.com/lordofduct/spacepuppy-unity-framework/blob/master/SpacepuppyBase/ColorHSV.cs

I had my own ColorUtil that extracted HSV, but I never actually made it a data structure.

So I implemented it today, its available under MIT license, which basically means (and this is from my mouth, the author)... you can use it however the heck you want, I really don't care, that's why my repo is public.

I also included a few extra bells and whistles. Operators, implicit and explicit conversion, normalize method, etc.

 

Thanks a lot! This is awesome!

 

Awesome, thanks!

 

Hey, I know this is an old post, but it was the first one I found while searching for a similar solution. I was trying to bring in a custom RGBtoHSV conversion when I realized that Unity has it's own function "Color.RGBToHSV();" and "Color.HSVToRGB();"

I think they're what you're looking for. I'm going to continue to use it for my project and if there happens to be any problem with this down the line i'll update. Hope this helps someone who comes across this in Unity 5.5 (2017).

 

Those functions didn't exist until Unity 5.3.

--Eric

 

umm last time i checked, he didn't ask for saturation and brightness..