我正在开发一个应用程序，用户可以在其中更改图像亮度、对比度、饱和度等。我可以使用下面的代码分别完成所有这些操作。
seekBar_brightness.setMax(512);
seekBar_brightness.setProgress(255);
seekBar_brightness.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
@Override
public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
progress = progress - 255;
Log.e("ImageColor_bri global", "" + bitmap_global);
Bitmap new_bm = changeBrightness(bitmap_global, (float) progress);
Log.e("ImageColor_bri local", "" + new_bm);
imageView.setImageBitmap(new_bm);
bitmap_local = new_bm;
// imageView.getDrawable().setColorFilter(ColorFilterGenerator.adjustBrightness(progress));//foto is my ImageView
}
@Override
public void onStartTrackingTouch(SeekBar seekBar) {
}
@Override
public void onStopTrackingTouch(SeekBar seekBar) {
}
});
seekbar_saturation.setMax(512);
seekbar_saturation.setProgress(255);
//seekbar_saturation.setThumbOffset(255);
seekbar_saturation.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
@Override
public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
progress = progress-255;
// imageView.buildDrawingCache();
// Bitmap bimap = imageView.getDrawingCache();
// imageView.setColorFilter(value);
Log.e("ImageColor_satu global", "" + bitmap_global);
Bitmap new_bm = adjustSaturation(bitmap_global, progress);
Log.e("ImageColor_satu local", "" + new_bm);
imageView.setImageBitmap(new_bm);
bitmap_local = new_bm;
// ColorMatrix matrix = new ColorMatrix();
// matrix.setSaturation(progress);
// ColorMatrixColorFilter filter = new ColorMatrixColorFilter(matrix);
// imageView.getDrawable().setColorFilter(ColorFilterGenerator.adjustSaturation(progress));
}
@Override
public void onStartTrackingTouch(SeekBar seekBar) {
}
@Override
public void onStopTrackingTouch(SeekBar seekBar) {
}
});
public static Bitmap changeBrightness(Bitmap bmp, float brightness) {
ColorMatrix cm = new ColorMatrix(new float[]
{
1, 0, 0, 0, brightness,
0, 1, 0, 0, brightness,
0, 0, 1, 0, brightness,
0, 0, 0, 1, 0
});
Bitmap ret = Bitmap.createBitmap(bmp.getWidth(), bmp.getHeight(), bmp.getConfig());
Canvas canvas = new Canvas(ret);
Paint paint = new Paint();
paint.setColorFilter(new ColorMatrixColorFilter(cm));
canvas.drawBitmap(bmp, 0, 0, paint);
return ret;
}
public static Bitmap adjustSaturation(Bitmap bmp, float value) {
value = cleanValue(value, 100);
if (value == 0) {
return bmp;
}
float x = 1 + ((value > 0) ? 3 * value / 100 : value / 100);
float lumR = 0.3086f;
float lumG = 0.6094f;
float lumB = 0.0820f;
float[] mat = new float[]
{
lumR * (1 - x) + x, lumG * (1 - x), lumB * (1 - x), 0, 0,
lumR * (1 - x), lumG * (1 - x) + x, lumB * (1 - x), 0, 0,
lumR * (1 - x), lumG * (1 - x), lumB * (1 - x) + x, 0, 0,
0, 0, 0, 1, 0,
0, 0, 0, 0, 1
};
ColorMatrix cm = new ColorMatrix(mat);
Bitmap ret = Bitmap.createBitmap(bmp.getWidth(), bmp.getHeight(), bmp.getConfig());
Canvas canvas = new Canvas(ret);
Paint paint = new Paint();
paint.setColorFilter(new ColorMatrixColorFilter(cm));
canvas.drawBitmap(bmp, 0, 0, paint);
return ret;
}
问题是：在增加或减少图像的亮度和增加或减少饱和度值后，图像颜色会完全改变。
我必须实现这一点，如果我反转到亮度和饱和度的搜索栏的初始值，我应该在第一次获得实际图像。
例如，如果将亮度值从 0 增加到 100，然后将饱和度值从 0 更改为 80。然后我将亮度和饱和度值反转为 0。然后我应该得到第一次的原始图像。
但是现在图像颜色在反转其值时不会反转。请帮忙。提前谢谢。