Color Banding Solved ooooooooooyyyyyyyeaaaaaaaaaa
I solved color banding in two phases
1) * when we use the BitmapFactory to decode resources it decodes the
resource in RGB565 which shows color banding, instead of using
ARGB_8888, so i used BitmapFactory.Options for setting the decode
options to ARGB_8888
second problem was whenever i scaled the bitmap it again got banded
2) This was the tough part and took a lot of searching and finally
worked
* the method Bitmap.createScaledBitmap for scaling bitmaps also
reduced the images to RGB565 format after scaling i got banded
images(the old method for solving this was using at least one
transparent pixel in a png but no other format like jpg or bmp
worked)so here i created a method CreateScaledBitmap to scale the
bitmap with the original bitmaps configurations in the resulting scale
bitmap(actually i copied the method from a post by logicnet.dk and
translated in java)
BitmapFactory.Options myOptions = new BitmapFactory.Options();
myOptions.inDither = true;
myOptions.inScaled = false;
myOptions.inPreferredConfig = Bitmap.Config.ARGB_8888;//
important
//myOptions.inDither = false;
myOptions.inPurgeable = true;
Bitmap tempImage =
BitmapFactory.decodeResource(getResources(),R.drawable.defaultart,
myOptions);//important
//this is important part new scale method created by someone
else
tempImage = CreateScaledBitmap(tempImage,300,300,false);
ImageView v = (ImageView)findViewById(R.id.imageView1);
v.setImageBitmap(tempImage);
// the function
public static Bitmap CreateScaledBitmap(Bitmap src, int dstWidth,
int dstHeight, boolean filter)
{
Matrix m = new Matrix();
m.setScale(dstWidth / (float)src.getWidth(), dstHeight /
(float)src.getHeight());
Bitmap result = Bitmap.createBitmap(dstWidth, dstHeight,
src.getConfig());
Canvas canvas = new Canvas(result);
//using (var canvas = new Canvas(result))
{
Paint paint = new Paint();
paint.setFilterBitmap(filter);
canvas.drawBitmap(src, m, paint);
}
return result;
}
Please correct me if i am wrong.
Also comment if it worked for you.
I am so happy i solved it, Hope it works for you.
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