JAVA Android: Darkening black letters/texts on a bitmap -

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i want darken black text on bitmap filter the bitmap , after research found this: 

private static void setcontrast(colormatrix cm, float contrast) {                 float scale = contrast + 1.f;                    float translate = (-.5f * scale + .5f) * 255.f;                 cm.set(new float[] {                        scale, 0, 0, 0, translate,                        0, scale, 0, 0, translate,                        0, 0, scale, 0, translate,                        0, 0, 0, 1, 0 });         }

my present challenge applying on bitmap darken black texts. kindly assist me.

i able find answer question using https://stackoverflow.com/a/17887577/5220210 , http://android.okhelp.cz/bitmap-set-contrast-and-brightness-android/

public static bitmap darkentext(bitmap bmp,  float contrast) {     colormatrix cm = new colormatrix();      float scale = contrast + 1.f;      float translate = (-.5f * scale + .5f) * 255.f;   cm.set(new float[] {          scale, 0, 0, 0, translate,          0, scale, 0, 0, translate,          0, 0, scale, 0, translate,          0, 0, 0, 1, 0 });      bitmap ret = bitmap.createbitmap(bmp.getwidth(), bmp.getheight(), bmp.getconfig());      canvas canvas = new canvas(ret);      paint paint = new paint();     paint.setcolorfilter(new colormatrixcolorfilter(cm));     canvas.drawbitmap(bmp, 0, 0, paint);      return ret; }

hope helps someone.


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