Try copying the original bitmap, creating a canvas over the copy, setting a circular clip path on it, then drawing the original bitmap with the color matrix you've defined into the canvas. That should work. Tom.
2009/4/22 Gaurav <[email protected]> > > Just to explain my problem a little more, I would like to change a > circular region on this image to black & white while the rest of the > image remains the same. I am able to get the complete image in black & > white by > > Bitmap myBitmap = BitmapFactory.decodeResource(getResources(), > R.drawable.myImage); > ColorMatrix colorMatrix = new ColorMatrix(); > colorMatrix.setSaturation(0); > paint = new Paint(); > ColorMatrixColorFilter cmcf = new ColorMatrixColorFilter(colorMatrix); > paint.setColorFilter(cmcf); > > Bitmap blackAndWhiteBitmap = Bitmap.createBitmap(myBitmap.getWidth(), > myBitmap.getHeight(), Bitmap.Config.ARGB_8888); > > Canvas drawingCanvas = new Canvas(blackAndWhiteBitmap ); > drawingCanvas.drawBitmap(myBitmap, 0, 0, paint); > > Can someone please suggest a solution. > > > > On Apr 21, 4:05 pm, Gaurav <[email protected]> wrote: > > Can someone please respond to this. I would like to make some > > modifications in the existing pixels represented by a path, this is a > > little different from FingerPaint Sample where we draw a fresh path > > overwriting the existing pixels. > > > > On Apr 21, 2:05 am, Gaurav <[email protected]> wrote: > > > > > How can we manipulate parts of an image selectively. For example, I > > > have a canvas based on bitmap of image I am working on. I would like > > > to change the brightness of a path on this canvas while the rest of > > > the image remains the same. > > > > > -Gaurav > > > --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Android Developers" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/android-developers?hl=en -~----------~----~----~----~------~----~------~--~---
