cv.IMDecode is Empty

[qing-shang]

Description

Steps to Reproduce

test.png is Transparent picture 1.im, _ := ioutil.ReadFile("test.png") 2.resMat, err := cv.IMDecode(im, cv.IMReadColor) 3.resMat.Empty() is true

Your Environment

• Operating System and version: ubuntu20.04
• OpenCV version used: 4.5.5
• How did you install OpenCV? make install_static
• GoCV version used: 0.30.0
• Go version: 1.18.1
• Did you run the env.sh or env.cmd script before trying to go run or go build?

[qing-shang]

But I use make install is not true

[jscheithe]

I have the same issue reading .png and .webp files with transparency. When I use gocv.IMRead(imgPath, gocv.IMReadUnchanged), it works.