Usage: scanimage [OPTION]... Start image acquisition on a scanner device and write PNM image data to standard output. -d, --device-name=DEVICE use a given scanner device -h, --help display this help message and exit -L, --list-devices show available scanner devices -v, --verbose give even more status messages -V, --version print version information Options specific to device `pnm': Source Selection: --filename <string> [/tmp/input.ppm] The filename of the image to be loaded. Image Enhancement: --brightness -100...100% [0] Controls the brightness of the acquired image. --contrast -100...100% [0] Controls the contrast of the acquired image. --grayify[=(yes|no)] [no] Load the image as grayscale. --three-pass[=(yes|no)] [no] Simulate a three-pass scanner by returning 3 separate frames. For kicks, it returns green, then blue, then red. --hand-scanner[=(yes|no)] [no] Simulate a hand-scanner. Hand-scanners often do not know the image height a priori. Instead, they return a height of -1. Setting this option allows one to test whether a front end can handle this correctly. --default-enhancements Set default values for enhancement controls (brightness & contrast).