static void setTranslate(ColorMatrix cm, float dr, float dg, float db, float da)
{
cm.set(new float[] {
2, 0, 0, 0, dr,
0, 2, 0, 0, dg,
0, 0, 2, 0, db,
0, 0, 0, 1, da
});
}
static void setContrastScaleOnly(ColorMatrix cm, float contrast)
{
float scale = contrast + 1.0f;
// float translate = (-.5f * scale + .5f) * 255.0f;
cm.set(new float[] {
scale, 0, 0, 0, 0,
0, scale, 0, 0, 0,
0, 0, scale, 0, 0,
0, 0, 0, 1, 0
});
}
private static void setContrastTranslateOnly(ColorMatrix cm, float contrast)
{
float scale = contrast + 1.0f;
float translate = (-.5f * scale + .5f) * 255.0f;
cm.set(new float[] {
1, 0, 0, 0, translate,
0, 1, 0, 0, translate,
0, 0, 1, 0, translate,
0, 0, 0, 1, 0
});
}