Aquí está la solución:
http://www.shaikhhamadali.blogspot.ro/2013/06/highlightfocusshadow-image-in-imageview.html
public Bitmap highlightImage(Bitmap src) {
// create new bitmap, which will be painted and becomes result image
Bitmap bmOut = Bitmap.createBitmap(src.getWidth() + 96, src.getHeight() + 96, Bitmap.Config.ARGB_8888);
// setup canvas for painting
Canvas canvas = new Canvas(bmOut);
// setup default color
canvas.drawColor(0, PorterDuff.Mode.CLEAR);
// create a blur paint for capturing alpha
Paint ptBlur = new Paint();
ptBlur.setMaskFilter(new BlurMaskFilter(15, Blur.NORMAL));
int[] offsetXY = new int[2];
// capture alpha into a bitmap
Bitmap bmAlpha = src.extractAlpha(ptBlur, offsetXY);
// create a color paint
Paint ptAlphaColor = new Paint();
ptAlphaColor.setColor(0xFFFFFFFF);
// paint color for captured alpha region (bitmap)
canvas.drawBitmap(bmAlpha, offsetXY[0], offsetXY[1], ptAlphaColor);
// free memory
bmAlpha.recycle();
// paint the image source
canvas.drawBitmap(src, 0, 0, null);
// return out final image
return bmOut;
}
esto paloma su pregunta para obtener más efectos de imagen de mapa de bits visita estos enlaces en el blog:
www.shaikhhamadali.blogspot.com
Highlight/focus/shadow the image in ImageView
Invert the Image in ImageView
Gray Scale the Image in ImageView (Android)
set Gamma of image in ImageView
Saturation Filter Effect on image in ImageView
Hue Filter Effect on image in ImageView
Engraving Effect on image in ImageView
Emboss Effect on image in ImageView
Smooth Effect on image in ImageView
Mean Removal Effect on image in ImageView
Set sharpness of the image in ImageView
Gaussian Blur the image(Bitmap) in ImageView
Convolution Matrix for image processing
Color Boost the image(Bitmap) in ImageView
Set brightness of the image(increase,decrease) in ImageView
B/W Contrast and Color Contrast the image in ImageView
Reducing color depth of image in ImageView
Sepia-toning Effect (Photography) of image in ImageView
filter color channels/ set color channels of image in ImageView
Change/Replacement/Remove pixel colors in ImageView
Water Mark the Image in ImageView
La pregunta era acerca de agregar brillo a mapas de bits, no texto !!! – Rodja