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Answer 1

+1 A:

Android supports transparency on PNG files. So convert your bitmap to a PNG using an editor like GIMP and the work's done for you.

Ally 2010-01-04 18:42:06

I have to do this programmatically. I do not know the images to advance.

Arutha 2010-01-05 08:43:58

Answer 2

A:

You can try to change the underlying Bitmap (if it is mutable) pixel with the setPixel method.

david 2010-01-04 21:15:50

it may be a very long and expensive. There is not a filtering system that makes it ?

Arutha 2010-01-05 08:45:19

Depends on how pixels in the image you want to change at every frame.What is the underlying bitmap size? How much of it do you want to change? 1% 10% 50%?There are many filtering classes in android.graphics but they do not operate on pixel basis.

david 2010-01-05 21:09:27

Answer 3

A:

Maybe this helps:

Bitmap buffer = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_4444);
buffer.eraseColor(Color.TRANSPARENT);

Tughi 2010-01-05 09:48:59

It will change all pixel's color. I need to make transparent only few pixels.

Arutha 2010-01-05 11:17:18

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Android image transparency

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