在Android中使用colorMatrix使黑色更暗
我目前有以下代码来获取一个Bitmap对象，剥离颜色，然后将其变为红色，但是我需要图像的较暗元素通过更暗，现在它就像有人在图像上放了一个红色的胶片，这几乎是我想要的，但需要黑人更黑暗：
Bitmap sourceBitmap = BitmapFactory.decodeFile(imgPath);
float[] colorTransform = {
0, 1f, 0, 0, 0,
0, 0, 0f, 0, 0,
0, 0, 0, 0f, 0,
0, 0, 0, 1f, 0};
ColorMatrix colorMatrix = new ColorMatrix();
colorMatrix.setSaturation(0f); //Remove Colour
colorMatrix.set(colorTransform); //Apply the Red
ColorMatrixColorFilter colorFilter = new ColorMatrixColorFilter(colorMatrix);
Paint paint = new Paint();
paint.setColorFilter(colorFilter);
Display display = getWindowManager().getDefaultDisplay();
Bitmap resultBitmap = Bitmap.createBitmap(sourceBitmap, 0, (int)(display.getHeight() * 0.15), display.getWidth(), (int)(display.getHeight() * 0.75));
image.setImageBitmap(resultBitmap);
Canvas canvas = new Canvas(resultBitmap);
canvas.drawBitmap(resultBitmap, 0, 0, paint);
没有找到相关结果
已邀请:
2 个回复
外镶受继
c = 2;//this will boost your contrast by 2x thus deepening the black (and lightning the white). I'm not sure why at 0 you have anything but black... maybe I don't understand the matrix as well as I think I do... I thought 1 (in place of my c) gets you the original colors. Anyway... give that a whirl. float[] colorTransform = { c, 1f, 0, 0, 0, 0, c, 0f, 0, 0, 0, 0, c, 0f, 0, 0, 0, 0, 1f, 0};娜拐赐巫潭
private static void setContrast(ColorMatrix cm, float contrast) { float scale = contrast + 1.f; float translate = (-.5f * scale + .5f) * 255.f; cm.set(new float[] { scale, 0, 0, 0, translate, 0, scale, 0, 0, translate, 0, 0, scale, 0, translate, 0, 0, 0, 1, 0 }); }