- Create a mutable bitmap from immutable. But instead of a copy, just create an empty one with the same width and height as the original one. - Create a canvas from this mutable bitmap (new Canvas(mutable)); - Create a ColorFilter object. Set its saturation to 0 (this is one way of doing this). (ColorMatrixColorFilter with a ColorMatrix whose saturation is set to 0). - Create a new Paint object and set its color-filter to the ColorMatrixColorFilter (bwPaint). - Draw the original bitmap onto the new canvas: mutableCanvas.drawBitmap(immutable, 0, 0, bwPaint); - After this drawBitmap call, the mutable bitmap contains a b&w version of your original mutable bitmap.
On May 28, 12:00 pm, Gavin Aiken <[email protected]> wrote: > Hi Marco, > > Would you mind giving a brief code snippet of how this might work? I've been > trying to get a similar function to run faster but when I use the bitmap the > values I thought were written by the canvas aren't there. > > Kind regards, > > Gav > > On Tue, Apr 21, 2009 at 12:21 AM, Marco Nelissen <[email protected]>wrote: > > > > > You can do this more efficiently by using a Paint and a ColorFilter. > > > On Mon, Apr 20, 2009 at 3:59 PM, sm12 <[email protected]> wrote: > > >> Solved. The problem was in the parameters of Color.rgb.- Hide quoted text - > > - Show quoted text - --~--~---------~--~----~------------~-------~--~----~ 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 -~----------~----~----~----~------~----~------~--~---
