Hi
If you are unable to get the native blur apis working you can use a
simple blur convolution/kernel matrix like:
0 0 0 0 0
0 1 1 1 0
0 1 1 1 0
0 1 1 1 0
0 0 0 0 0
(This is much like the convolution matrix you get with a gaussian blur
so I assume you have some code thats able to apply these to images)
-Nick
On Mon, Apr 21, 2008 at 6:48 AM, Rui Martins <[EMAIL PROTECTED]> wrote:
>
> Just guessing here, but several stuff to verify.
>
> - you probably should set the Filter flag, after adding a MaskFilter,
> and not before.
> (just to be sure, although not state anywhere).
>
> - Are your shure that your originalBitmap has a Alpha channel ?
> Verify!
>
> - If there is an Alpha channel on originalBitmap, is it filled with
> something relevant, or is it filled with the same value ? What value
> is that ?
>
> - Have you tried the other BlurMaskFilter.Blur.* Constants ?
>
> - Have you tried drawing the originalBitmap, with the blurPaint,
> directly to the canvas that is passed to a view onDraw method ?
>
> The MaskFilter Blur process, probably requires the target Canvas to
> have an Alpha channel !
>
> Hope some of this may help.
>
>
>
>
> On Apr 18, 8:36 pm, qvark <[EMAIL PROTECTED]> wrote:
> > Anybody?
> >
> > On 13 abr, 12:03, qvark <[EMAIL PROTECTED]> wrote:
> >
> > > Hello all, I have tobluran image and I have implemented my ownblur
> > > algorithm (gaussian), but it is too slow (I guess it is due to the
> > > emulator and the interpreted nature of the Dalvik VM).
> >
> > > I have found the class android.graphics.BlurMaskFilter but I haven't
> > > been able to apply it successfully to an image (Bitmap).
> >
> > > If I try something like:
> >
> > > Paint blurPaint = new Paint();
> > > blurPaint.setFilterBitmap(true);
> > > blurPaint.setMaskFilter(new BlurMaskFilter(radius,
> > > BlurMaskFilter.Blur.NORMAL));
> >
> > > Bitmap blurred = Bitmap.createBitmap(800, 600,
> > > Bitmap.Config.RGB_565);
> > > Canvas c = new Canvas(blurred);
> > > c.drawBitmap(originalBitmap, 0, 0, blurPaint);
> >
> > > nothing happens (well, the borders of the image appear with shade,
> > > with seems normal, according to "Note: if the paint contains a
> > > maskfilter that generates a mask which extends beyond the bitmap's
> > > original width/height (e.g. BlurMaskFilter), then the bitmap will be
> > > drawn as if it were in a Shader with CLAMP mode. "
> >
> > > But the image is not blurred!!
> >
> > > I have tried a different approach passing the image to grey scale, the
> > > grey to the alpha channel (because there is only a extractAlpha()
> > > method that takes a Paint) and then:
> >
> > > Bitmap blurredBitmap = bm.extractAlpha(blurPaint, new int[] {0, 0});
> >
> > > But it makes the VM crash!! (seems like a bug inside the
> > > extractAlpha() method, because extractAlpha() without params also
> > > crash). It crashes when I use Bitmap.Config.ARGB_8888 or
> > > Bitmap.Config.ARGB_4444, but not if I use Bitmap.Config.RGB_565, but
> > > then obviously I lose the alpha information and the resulting bitmap
> > > is all black.
> >
> > > Could anybody please provide a working example of blurring an image?
> >
> > > Thanks in advance,
> >
> > > Jose Luis.
> >
>
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