Android Convert a bitmap to Grayscale but keep one Color

Question

I want to set my whole bitmap to grayscale, but I want to keep one color, red or blue or green or any color the user likes? Is this possible with a colormatrix? Here's a link, that's what I want to do but in android. How can I convert an RGB image to grayscale but keep one color?

Thank you very much.

Good challenge, actually! Look at here and the related doc to achieve that: http://stackoverflow.com/a/6488289/2545832 — Laurent Meyer, Jan 20 '16 at 18:04
I tried it,but it just makes my bitmap brighter. Is there any other way to do it? — RoterBaron, Jan 21 '16 at 09:45

score 1 · Answer 1 · edited Feb 03 '17 at 10:35

1

Try this:

ImageView imageView;
Bitmap photo,photo1;
photo1 = Bitmap.createBitmap(photo.getWidth(),photo.getHeight(),photo.getConfig());

for(int i=0;i<photo.getWidth();i++)
{
    for(int j=0;j<photo.getHeight();j++){
        int p=photo.getPixel(i,j);
        int r= Color.red(p);
        int g=Color.green(p);
        int b=Color.blue(p);
        int alpha=Color.alpha(p);
        r=0;
        g=g+150;
        b=0;
        alpha=0;
        photo1.setPixel(i,j, Color.argb(Color.alpha(p),r,g,b));
    }
}
imageView.setImageBitmap(photo1)

edited Feb 03 '17 at 10:35

rghome

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answered Feb 03 '17 at 10:12

SEEMA

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You should add some narrative to your answer. Answers with just code will get deleted. – rghome Feb 03 '17 at 10:35

Android Convert a bitmap to Grayscale but keep one Color

1 Answers1