CODEWITHSUNDEEP
javaandroidopencv
mrvladimir
mrvladimir

Reputation: 559

Remove alpha channel of Mat in opencv android java

I'm loading a Mat from a Bitmap using Utils.bitmapToMat(). This produces a matrix with 4 channels. How do I get a matrix with 3 channels, with the alpha channel simply removed?

In other words, I would like the python equivalent of mat[:,:,0:3] in opencv java on android.

Upvotes: 1

Views: 1483

Answers (1)

Rotem
Rotem

Reputation: 32144

Assuming the alpha channel is the last color channel (BGRA or RGBA color format), you may use Imgproc.cvtColor with Imgproc.COLOR_BGRA2BGR argument:

// Creating the empty destination matrix
Mat dst_mat = new Mat();

// Converting the image from BGRA to BGR and saving it in the dst_mat matrix
Imgproc.cvtColor(mat, dst_mat, Imgproc.COLOR_BGRA2BGR);

Note:

Upvotes: 1

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