以编程方式增强ImageView的亮度 [英] Enhancing ImageView brightness programmatically
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问题描述
我有一个Android应用程序,其中使用以下代码提高了图像的亮度.但这很慢,所以没有人知道一种快速的方法来增强android中imageview的图像亮度.请记住,这是在提高图像视图的亮度,而不是屏幕的亮度
I have an android app in which I am increasing brightness of image with the code below. But this is very slow so does anyone knows a fast way to enhance image brightness of an imageview in android. Keep in mind this is improving imageview brightness not screen brightness
public static Bitmap doBrightness(Bitmap src, int value) {
//Log.e("Brightness", "Changing brightnhjh");
int width = src.getWidth();
int height = src.getHeight();
Bitmap bmout = Bitmap.createBitmap(width, height, src.getConfig());
int A, R, G, B;
int pixel;
for (int i = 0; i < width; i=i++) {
for (int j = 0; j < height; j=j++) {
pixel = src.getPixel(i, j);
A = Color.alpha(pixel);
R = Color.red(pixel);
G = Color.green(pixel);
B = Color.blue(pixel);
R += value;
if (R > 255) {
R = 255;
} else if (R < 0) {
R = 0;
}
G += value;
if (G > 255) {
G = 255;
} else if (G < 0) {
G = 0;
}
B += value;
if (B > 255) {
B = 255;
} else if (B < 0) {
B = 0;
}
bmout.setPixel(i, j, Color.argb(A, R, G, B));
}
}
return bmout;
}
这是图片视图
imageview.setImageBitmap(doBrightness(image, 40));
推荐答案
我已解决此问题,我使图像变亮,然后在imageview中显示.我使用的代码如下:
I have got a work around for this issue i made the image brighter and then shown it in an imageview. The code i used is given below:
foto.setColorFilter(brightIt(100));//foto is my ImageView
//and below is the brightIt func
public static ColorMatrixColorFilter brightIt(int fb) {
ColorMatrix cmB = new ColorMatrix();
cmB.set(new float[] {
1, 0, 0, 0, fb,
0, 1, 0, 0, fb,
0, 0, 1, 0, fb,
0, 0, 0, 1, 0 });
ColorMatrix colorMatrix = new ColorMatrix();
colorMatrix.set(cmB);
//Canvas c = new Canvas(b2);
//Paint paint = new Paint();
ColorMatrixColorFilter f = new ColorMatrixColorFilter(colorMatrix);
//paint.setColorFilter(f);
return f;
}
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