/** Builds a TYPE_SATURATE instance */
public static ColorMatrixRable buildSaturate(float s) {
ColorMatrixRable8Bit filter = new ColorMatrixRable8Bit();
filter.type = TYPE_SATURATE;
filter.matrix =
new float[][] {
{0.213f + 0.787f * s, 0.715f - 0.715f * s, 0.072f - 0.072f * s, 0, 0},
{0.213f - 0.213f * s, 0.715f + 0.285f * s, 0.072f - 0.072f * s, 0, 0},
{0.213f - 0.213f * s, 0.715f - 0.715f * s, 0.072f + 0.928f * s, 0, 0},
{0, 0, 0, 1, 0}
};
return filter;
}
/**
* Builds a TYPE_HUE_ROTATE instance.
*
* @param a angle, in radian
*/
public static ColorMatrixRable buildHueRotate(float a) {
ColorMatrixRable8Bit filter = new ColorMatrixRable8Bit();
filter.type = TYPE_HUE_ROTATE;
float cos = (float) Math.cos(a);
float sin = (float) Math.sin(a);
// System.out.println("sin : " + sin + " cos : " + cos);
float a00 = 0.213f + cos * 0.787f - sin * 0.213f;
float a10 = 0.213f - cos * 0.212f + sin * 0.143f;
float a20 = 0.213f - cos * 0.213f - sin * 0.787f;
float a01 = 0.715f - cos * 0.715f - sin * 0.715f;
float a11 = 0.715f + cos * 0.285f + sin * 0.140f;
float a21 = 0.715f - cos * 0.715f + sin * 0.715f;
float a02 = 0.072f - cos * 0.072f + sin * 0.928f;
float a12 = 0.072f - cos * 0.072f - sin * 0.283f;
float a22 = 0.072f + cos * 0.928f + sin * 0.072f;
filter.matrix =
new float[][] {
{a00, a01, a02, 0, 0},
{a10, a11, a12, 0, 0},
{a20, a21, a22, 0, 0},
{0, 0, 0, 1, 0}
};
/*for(int i=0; i<4; i++){
for(int j=0; j<5; j++)
System.out.print(filter.matrix[i][j] + " ");
System.out.println();
}*/
return filter;
}
/** Builds a TYPE_MATRIX instance */
public static ColorMatrixRable buildMatrix(float[][] matrix) {
if (matrix == null) {
throw new IllegalArgumentException();
}
if (matrix.length != 4) {
throw new IllegalArgumentException();
}
float[][] newMatrix = new float[4][];
for (int i = 0; i < 4; i++) {
float[] m = matrix[i];
if (m == null) {
throw new IllegalArgumentException();
}
if (m.length != 5) {
throw new IllegalArgumentException();
}
newMatrix[i] = new float[5];
for (int j = 0; j < 5; j++) {
newMatrix[i][j] = m[j];
}
}
/*for(int i=0; i<4; i++){
for(int j=0; j<5; j++)
System.out.print(newMatrix[i][j] + " ");
System.out.println();
}*/
ColorMatrixRable8Bit filter = new ColorMatrixRable8Bit();
filter.type = TYPE_MATRIX;
filter.matrix = newMatrix;
return filter;
}
/** Builds a TYPE_LUMINANCE_TO_ALPHA instance */
public static ColorMatrixRable buildLuminanceToAlpha() {
ColorMatrixRable8Bit filter = new ColorMatrixRable8Bit();
filter.type = TYPE_LUMINANCE_TO_ALPHA;
filter.matrix = MATRIX_LUMINANCE_TO_ALPHA;
return filter;
}