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此代码遍历所有像素的图片会改变每个图像的RGB。当我运行代码时，大约需要1-2分钟才能完成。我认为这是由于整个循环完成了590万次。我将如何使这个过程更快，例如> 10秒或接近此。代码需要1分钟来处理
任何帮助表示赞赏。谢谢
int r,g,b,colour;
int [] allpixels = new int [picture.getHeight() * picture.getWidth()];
picture.getPixels(allpixels, 0, picture.getWidth(), 0, 0, picture.getWidth(), picture.getHeight());
for(int i = 0; i < allpixels.length; i++)
{
colour = allpixels[i];
r = Color.red(colour);
b = Color.blue(colour);
g = Color.green(colour);
if(r < FIRSTSECTION){
r = FIRST;
}else if(r >= SECONDSECTION && r < THIRDSECTION){
r = SECOND;
}else if(r >= THIRDSECTION && r < FOURTHSECTION){
r = THIRD;
}else if(r >= FOURTHSECTION && r < FIFTHSECTION){
r = FORTH;
}
if(b < FIRSTSECTION){
b = FIRST;
}else if(b >= SECONDSECTION && b < THIRDSECTION){
b = SECOND;
}else if(b >= THIRDSECTION && b < FOURTHSECTION){
b = THIRD;
}else if(b >= FOURTHSECTION && b < FIFTHSECTION){
b = FORTH;
}
if(g < FIRSTSECTION){
g = FIRST;
}else if(g >= SECONDSECTION && g < THIRDSECTION){
g = SECOND;
}else if(g >= THIRDSECTION && g < FOURTHSECTION){
g = THIRD;
}else if(g >= FOURTHSECTION && g < FIFTHSECTION){
g = FORTH;
}
allpixels[i] = Color.argb(1, r, g, b);
}
Bitmap bitmap = Bitmap.createBitmap(picture.getWidth(), picture.getHeight(), Bitmap.Config.ARGB_8888);
bitmap.setPixels(allpixels, 0, bitmap.getWidth(), 0, 0, bitmap.getWidth(), bitmap.getHeight());
drawableBitmap = new BitmapDrawable(getResources(), bitmap);