If you follow my example you can add the colors by adding the
components and then recombining them into a color int.
int r = Color.red(bitmap1) + Color.red(bitmap2);
int g = Color.green(bitmap1) + Color.green(bitmap2);
int b = Color.blue(bitmap1) + Color.blue(bitmap2);
int newPixel = Color.argb( 1, r, g, b);
I think one of the PorterDuffXfermodes is for adding also. That would
probably be faster.
On Mar 16, 11:26 pm, Nithin <nithin.war...@gmail.com> wrote:
> Thanks for all replies.. By merge I mean adding, one image with
> another.
>
> Nithin
>
> On Mar 16, 6:28 pm, Warren <warrenba...@gmail.com> wrote:
>
> > I use something like the following function. It really depends what
> > you mean by "merge". Do you mean average, alpha over, multiply, add,
> > etc.?
> > Anyway, you can change the arithmetic here to suit your needs. The
> > important parts are that you copy the bitmap you wish to change so
> > that you have a mutable/changeable bitmap, and that you call
> > setPixel() to change the bitmap pixels to their new color.
>
> > In this example, I'm looping over all the pixels and assuming both
> > bitmaps are the same size.
>
> > You can also do this with a canvas, but this approach is the most
> > flexible. It is not terribly fast. I only use it at the startup of my
> > program. But unless you are calling it repeatedly, it shouldn't slow
> > you down too much.
>
> > private static Bitmap applyMask(Bitmap tileBitmap, Bitmap
> > maskBitmap)
> > {
> > Bitmap workingBitmap = tileBitmap.copy(bitmapConfig, true);
> > //
> > IMPORTANT
> > int width = tileBitmap.getWidth();
> > int height = tileBitmap.getHeight();
> > for(int x=0; x<width; x++){
> > for(int y=0; y<height; y++){
> > int maskPixel = maskBitmap.getPixel(x, y);
> > int tilePixel = tileBitmap.getPixel(x, y);
>
> > //change this line for different color
> > mixing types
> > int newPixel = Color.argb(
> > Color.red(maskPixel),
> > Color.red(tilePixel), Color.green(tilePixel), Color.blue(tilePixel));
>
> > workingBitmap.setPixel(x, y, newPixel);
> > //IMPORTANT
> > }
> > }
> > return workingBitmap;
> > }
>
> > On Mar 16, 1:08 am, NapoleonLiu <liuwa...@neusoft.com> wrote:
>
> > > I am a new one in UI coding. So may be my way is not the best..
>
> > > Panit mPaint = new Paint();
> > > mPaint.setXfermode(new PorterDuffXfermode(Mode.DST_IN));
> > > mPaint.setAlpha(XX);
> > > notice that Mode.DST_IN is important(Better to see it's api-doc.)
> > > Use this paint to draw a "ALPHA_8" bitmap on your org bitmap ,then you can
> > > get a Bitmap which have special alpha.
> > > So you can get two special alpha bitmap ,then draw them with Mode.DST_IN.
> > > I think you will get you want.
> > > But there must be a nice way, to do a calculation on the alpha area of
> > > bitmap.
> > > hope it can help you.
>
> > > On Tue, 16 Mar 2010 13:20:01 +0800, BobG <bobgard...@aol.com> wrote:
> > > > How about set the Alpha channel in each one to 50% so they are both
> > > > half see through?
>
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