selectROI pointer almost invisible on certain colours

[JeongJuhyeon]

System information (version)

• OpenCV => 3.4.2.17
• Operating System / Platform => Win 10 64-Bit
• Compiler => Python 3 (opencv-python)

Detailed description

When using selectROI you get a crosshair pointer that seemingly changes colour depending on the background behind it. Problem is that with certain background colours it's almost impossible to see. The pointer is inside the circle, you might have to zoom in to even see it.

Steps to reproduce

Use the selectROI function. Mouse over a greyish background.