Just wanted to share my solution. I got this idea from a flash
script.
I have a slider that adjust the "value", where is ranges from 0 to
360.
public void adjustHue(ColorMatrix cm, float value) {
value = cleanValue(value,180f)/180f*(float)Math.PI;
if (value == 0 ) { return; }
float cosVal = (float)Math.cos(value);
float sinVal = (float)Math.sin(value);
float lumR = 0.213f;
float lumG = 0.715f;
float lumB = 0.072f;
float[] mat = new float[] {
lumR+cosVal*(1-lumR)+sinVal*(-lumR),lumG+cosVal*(-lumG)+sinVal*(-
lumG),lumB+cosVal*(-lumB)+sinVal*(1-lumB),0,0,
lumR+cosVal*(-lumR)+sinVal*(0.143f),lumG+cosVal*(1-lumG)
+sinVal*(0.140f),lumB+cosVal*(-lumB)+sinVal*(-0.283f),0,0,
lumR+cosVal*(-lumR)+sinVal*(-(1-lumR)),lumG+cosVal*(-lumG)
+sinVal*(lumG),lumB+cosVal*(1-lumB)+sinVal*(lumB),0,0,
0f,0f,0f,1f,0f,
0f,0f,0f,0f,1f
};
cm.postConcat(new ColorMatrix(mat));
}
On May 10, 1:52 am, rsung <[email protected]> wrote:
> I want to create a slider that changes thehueon an image. I tried
> using ColorMatrix but it's not working as expected.
> Any help would much appreciated. Thanks.
>
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