CODEWITHSUNDEEP
androidimagegrayscale
Morendo
Morendo

Reputation: 800

android : convert to greyscale with transparency

I'm trying to convert an image I get from a rest call to a greyscale, however I need to keep the transparency because the image is an overlay on a map. I tried : 

Bitmap bmpGrayscale = Bitmap.createBitmap(width, height, Bitmap.Config.RGB_565);
Canvas c = new Canvas(bmpGrayscale);
Paint paint = new Paint();
ColorMatrix cm = new ColorMatrix();
cm.setSaturation(0);
ColorMatrixColorFilter f = new ColorMatrixColorFilter(cm);
paint.setColorFilter(f);
c.drawBitmap(bmpOriginal, 0, 0, paint);

But it doesn't keep the transparency ... so if any of you has an idea I'll be glad to test it.

Thanks !

Upvotes: 0

Views: 545

Answers (1)

Morrison Chang
Morrison Chang

Reputation: 12121

Your Bitmap.Config is RGB_565 which doesn't have an alpha which is the transparency layer. Try ARGB_8888.

Upvotes: 3

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