public void onDraw(Canvas canvas) 에서
Sepia
Paint paint = new Paint();
paint.setAntiAlias(true);
ColorMatrix cm = new ColorMatrix(
new float[] { 0.3930000066757202f, 0.7689999938011169f,
0.1889999955892563f, 0, 0, 0.3490000069141388f,
0.6859999895095825f, 0.1679999977350235f, 0, 0,
0.2720000147819519f, 0.5339999794960022f,
0.1309999972581863f, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 1 });
paint.setColorFilter(new ColorMatrixColorFilter(cm));
canvas.drawBitmap( ... );
Gray Scale
cm = new ColorMatrix(
new float[] { 0.299f, 0.587f, 0.114f, 0, 0, 0.299f, 0.587f, 0.114f,
0, 0, 0.299f, 0.587f, 0.114f, 0, 0, 0, 0, 0, 1, 0 });
Reverse
cm = new ColorMatrix(
new float[] { -1, 0, 0, 0, 255, 0, -1, 0, 0, 255, 0, 0, -1, 0, 255,
0, 0, 0, 1, 0 });
Adjust Contrast
ColorMatrix cm = new ColorMatrix();
float contrast = 2;
cm.set(new float[] {
contrast, 0, 0, 0, 0, 0, contrast, 0, 0, 0, 0, 0, contrast, 0, 0, 0, 0, 0, 1, 0 });
paint.setColorFilter(new ColorMatrixColorFilter(cm));
Adjust Brightness
ColorMatrix cm = new ColorMatrix();
float brightness = -25;
cm.set(new float[] {
1, 0, 0, 0, brightness, 0, 1, 0, 0, brightness, 0, 0, 1, 0, brightness, 0, 0, 0, 1, 0 });
paint.setColorFilter(new ColorMatrixColorFilter(cm));
Adjust saturation
ColorMatrix cm = new ColorMatrix();
cm.setSaturation(.5f);
paint.setColorFilter(new ColorMatrixColorFilter(cm));
1보다 큰 값을 넘겨주면 채도가 늘어난다. 영(0)과 1 사이의 값이라면 채도는 줄어든다.
