基于安卓实现色阶调整代码示例
时间: 2023-11-26 11:06:44 浏览: 37
以下是基于Android平台实现色阶调整的代码示例:
```java
public static Bitmap adjustLevels(Bitmap bitmap, int blackLevel, int whiteLevel) {
int numPixels = bitmap.getWidth() * bitmap.getHeight();
int[] pixels = new int[numPixels];
bitmap.getPixels(pixels, 0, bitmap.getWidth(), 0, 0, bitmap.getWidth(), bitmap.getHeight());
int numChannels = 3; // RGB channels
float[] low = new float[numChannels];
float[] high = new float[numChannels];
float[] mid = new float[numChannels];
for (int i = 0; i < numChannels; i++) {
low[i] = blackLevel;
high[i] = whiteLevel;
mid[i] = (low[i] + high[i]) / 2;
}
for (int i = 0; i < numPixels; i++) {
int pixel = pixels[i];
int r = Color.red(pixel);
int g = Color.green(pixel);
int b = Color.blue(pixel);
int[] rgb = {r, g, b};
for (int j = 0; j < numChannels; j++) {
if (rgb[j] < low[j]) {
rgb[j] = 0;
} else if (rgb[j] > high[j]) {
rgb[j] = 255;
} else {
rgb[j] = (int) ((rgb[j] - mid[j]) * (255.0 / (high[j] - low[j])) + 128);
}
}
pixels[i] = Color.rgb(rgb[0], rgb[1], rgb[2]);
}
Bitmap adjustedBitmap = Bitmap.createBitmap(bitmap.getWidth(), bitmap.getHeight(), Bitmap.Config.ARGB_8888);
adjustedBitmap.setPixels(pixels, 0, bitmap.getWidth(), 0, 0, bitmap.getWidth(), bitmap.getHeight());
return adjustedBitmap;
}
```
该代码示例中,使用了Android平台的Bitmap类来对图片进行操作。将图片的像素值存储在int数组中,然后对每个像素进行RGB通道的色阶调整,最后使用setPixels()方法将处理好的像素值重新设置到新的Bitmap对象中。