1.颜色处理
- 颜色矩阵 ColorMatrix 4*5 (RGBA)
Bitmap bmp = Bitmap.createBitmap(bitmap.getWidth(),bitmap.getHeight(),Bitmap.Config.ARGB_8888);
Canvas canvas = new Canvas(bmp);
Paint paint = new Paint()；
paint.setColorFilter(new ColorMatrixColorFilter(colorMatrix));
canvas.drawBitmap(bitmap,0,0,paint); //将原图 bitmap 绘制到该 bmp 中
mImageView.setImageBitmap(bmp);
2.像素点
int[] oldPx = new int[width * height];
int[] newPx = new int[width * height];
bm.getPixels(oldPx, 0, width, 0, 0, width, height);
2.变形
变形矩阵 (平移 旋转 缩放 错切) Matrix 3*3
怎么样将一个图片旋转 30°，然后平移到 (100,100) 的地方？
a.
Matrix matrix = new Matrix();
matrix.postRotate(30); //后乘
matrix.postTranslate(100,100);
b.
Matrix matrix = new Matrix();
matrix.setTranslate(100,100);
matrix.preRotate(30); //前乘
像素块
drawBitmapMesh
