Question

The title maybe a little vague, let me give you an example:
if we change a colorful image into black and white, we still can recognize the objects in it.
My question is, can I change the color to RED or GREEN or other color rather than black and white in programs (I prefer Java).

What I want to do is just like this question:
How would I tint an image programmatically on iOS?

However, I want to do this on Android instead of iPhone.

Answer 1

Do something like this

Bitmap sourceBitmap = BitmapFactory... 

float[] colorTransform = .. // read ColorMatrix docs to understand the transform
ColorMatrix colorMatrix = new ColorMatrix();

ColorMatrixColorFilter colorFilter = new ColorMatrixColorFilter(colorMatrix);
Paint paint = new Paint();
paint.setColorFilter(colorFilter);         

Bitmap resultBitmap = Bitmap.createBitmap(
     sourceBitmap.getWidth(), 
     sourceBitmap.getHeight(),
     Bitmap.Config.RGB_565);

 Canvas canvas = new Canvas(resultBitmap);
 canvas.drawBitmap(sourceBitmap, 0, 0, paint);

int pixelColor=resultBitmap.getPixel(123,321);