从RGB绘制CMYK颜色

Question

Hello. I have a screen like above. By using the sliders, I get red, green, blue. Also, I calculate cyan, magenta, yellow and from red, green, blue for CMYK. My question is that is there any way to show CMYK colour in java like light purple in the picture.

private void stateChanged() {
      red= sliderRed.getValue();
      green= sliderGreen.getValue();
      blue= sliderBlue.getValue();
      txt_background.setBackground(new Color(red, green, blue));
}

Answer 1

It looks to me like the java color class, has a constructor for making a color object in cmyk

https://docs.oracle.com/javase/7/docs/api/java/awt/Color.html#Color(java.awt.color.ColorSpace,%20float[],%20float)

and

https://docs.oracle.com/javase/7/docs/api/java/awt/color/ColorSpace.html

So you would end up with something like

Color cmykColorValue = new Color(TYPE_CMYK, [cValue, mValue, yValue, kValue], alpha)

Where alpha is form 0 to 1, and cValue, mValue, yValue, kValue are the corresponding cmyk values.

That should make a new CMYK color object that can be used anywhere a color object can be used.

Answer 2

用于CMYK的Color构造器的正确用法如下：

java.awt.Color cmyk = new Color(ColorSpace.getInstance(ColorSpace.TYPE_CMYK), new float [] {cyan,magenta,yellow}, key/alpha);