php - Mixing colors(adding and subtracting colors) like in Art Class! -

I am creating a color class and I'm adding more (color, percent) to the operation; For less (color, percent) it is necessary to add and subtract colors and I have a difficult time arithmetic.

Operation - Echo color ('blue') - & gt; How can I use RGB or HSB (HSV) or hex using more ('yellow', 100%):

code> echo Color ('blue') - & gt; More ('yellow', 50%);

• I have a very vague imagination to reduce blue + .5 * yellow = black-green

: < / P>

Operation - Echo color ('orange-yellow') -> low ('red', 50%); Orange-yellow - .5 * red = yellow

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Edit:

Strong> Thank you for your input so far. I tried to add CYM to each other in the CYM and unfortunately red (255, 0, 0) ~ = (0, 1, 1) in the CYM and after that if you add blue (0, 0, 255) to it I = (1, 1, 0) is equal to (1, 2, 1) or (1, 1, 1) which is black in the CYM

I have a hue saturation brightness (HSB) Found the closest using. In fact it works with every color combination except the red color. I believe that it is at the beginning and end of the red color (using color degree [0, 360]).

More of your ideas will be highly appreciated!

Okay, after an evening with a roam around, this is the "more" method that I am really happy with.

It uses HSB (Hu-saturation-brightness) color model, now do not ask me why I did not work the CYM. I'm a color novice. It appears as if it would work to see how the printers mix the colors. I like the HSB model, in addition, when you use the color picker, its Photoshop Is shown.

I have added this as an answer, so let me know what you think! Thanks again!

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Any help would be great!

Thank you, Matt

An internal solution using RGB color space To represent the colors - red, green, value. When a hex representation is required, make one with the existing values ​​and send it back.

more and less methods then just reddish in red, green or blue values.

  public function more ($ color, $ percent) {$ this- & gt; Color [$ color] + = $ this- & gt; Color [$ color] * $ percent; }  

Convert to a hex string

  public function toHex () {$ red = $ this- & gt; Color ['red']; $ Green = $ this- & gt; Color ['green']; $ Blue = $ this- & gt; color blue']; Return Sprint ("% 02x% 02x% 02X", $ red, $ green, blue); }  

Changing the string such as 'Orange-Green' contains RGB components in slightly different problems.