how to use the LightingColorFilter to make the image form dark to light

Question

I want to add light of the image, I want to use LightingColorFilter

LightingColorFilter lcf = new LightingColorFilter( mul, add); 
imageView.setColorFilter(lcf);

but I don't know how to adjust mul, add, can you give some link or code or parameters to adjust the light of the image?

Thank you

Answer 1

The integer values are colours (you may want to have a closer look here http://developer.android.com/reference/android/graphics/Color.html)
4 Bytes are used, one for alpha, one for red, one for green, one for blue range - every single from 0 to 255 (hex 0 to FF)

so the colour in hex looks like

0 x 00     00   00    00
    alpha  red  green blue

If you want to set for example red to zero, use

mul: 0xFF00FFFF
add: 0x00000000

If you want to force blue to be full-on, use

mul: 0xFFFFFFFF
add: 0x000000FF 

Answer 2

Canvas canvas= new Canvas(my_bitmap); // create canvas from bitmap
Paint my_paint = new Paint(); // create Paint from bitmap

my_paint.setColorFilter(new LightingColorFilter(0x77777777, 0x77777777));//(mul, add)

canvas.drawBitmap(my_bitmap, 0, 0, my_paint );

1- now you can show my_bitmap

2- now my_bitmap have about 50% more light

3- you can change (mul, add) to understand how work

4- also can use my_paint in other graphic method