Create a transparent Mat in Android

paatz04
1 ●2

Hi,

I'm trying to create a transparent mat but somehow the alpha channel doesn't work right. This is what I'm doing right now:

Mat retFrame = new Mat(rows, cols, CvType.CV_8UC3, new Scalar(255,255, 255, 0));

I tried it with all kinds of alpha values Thanks!

Comments

again alpha makes only sense when compositing 2 images.

opencv, being mainly a computer-vision library, has no builtin support for this.

berak ( 2018-07-05 10:01:56 -0600 )edit

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there is no transapnrent channel in image processing.

CvType.CV_8UC3, new Scalar(255,255, 255, 0) NO Scalar(255,255, 255, 0) four values so it is CvType.CV_8UC4

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Asked: 2018-07-04 07:00:58 -0600

Seen: 1,019 times

Last updated: Jul 04 '18