Here you go. BTW, I have to give credit to where it's due. This is
a port of ColorMatrix by Grant Skinner.
protected float cleanValue(float p_val, float p_limit) {
return Math.min(p_limit,Math.max(-p_limit,p_val));
}
On May 16, 12:16 am, nayana urs <[email protected]> wrote:
> hi thanks for your solution can u please tell me what implementation should
> be there in cleanvalue(float,float)method
> with regards
> Nayana
>
>
>
> On Sat, May 15, 2010 at 2:39 AM, pkc <[email protected]> wrote:
> > 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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