How to capture single PNG image using fswebcam

fswebcam -r 1920x1080 --png 9 -d /dev/video0 -D 0 test.png

where:

• -r 1920x1080 is the resolution of the image. The camera must support this. In order to see supported resolutions, see How to list USB camera video formats using v4l2-ctl
• --png 9 means *output PNG with quality 9.*PNG is lossless, so the quality is just the compression factor. 9 means accept higher CPU consumption for slightly smaller filesize.
• -d /dev/video0 means to use the camera in /dev/video0
• -D 0 means no delay before capturing the image
• test.png means: Write the image to test.png.