Autolight

Is the little linux tool for X Window System to correct laptop backlight level based on environment lights level. Also works well when gnome standard lightning slider doesn't works. Cameras driver must support MJPEG video streaming type and memory MMAP.

Compile with DEBUG env to provide additional output.

Usage

After install in gnome environments press Alt+F2 and enter autolight. Or the same in terminal.

Dependencies

• libjpeg-dev
• libxcb-util-dev
• libxcb-randr0-dev

If you use Ubuntu just run in terminal:

sudo apt install libjpeg-dev libxcb-util-dev libxcb-randr0-dev

On other distros take care yourself.

Install

./configure && make && sudo make install

Uninstall

sudo make uninstall

Options

• -h (--help) Help message.
• -d (--device=DEVICE_FILE) Video camera device file. Tested "/dev/video(0-9)" by default.
• --display=DISPLAY_NAME Display name. By default used $DISPLAY from envs.
• --width=VALUE Camera capture width(640px by default).
• --height=VALUE Camera capture height(480px by default).
• -c (--calibrate=VALUE) Frames used to calibrate camera exposure. Only if camera supports V4L2_EXPOSURE_AUTO, V4L2_EXPOSURE_SHUTTER_PRIORITY or V4L2_EXPOSURE_APERTURE_PRIORITY auto type. Ignored otherwise.
• -x (--brightness=[STD|OPT1|OPT2]) Algorithm to calculate delta brightness.
  • STD: 0.2126 * R + 0.7152 * G + 0.0722 * B
  • OPT1: 0.299 * R + 0.587 * G + 0.114 * B
  • OPT2: sqrt(0.299 * R^2 + 0.587 * G^2 + 0.114 * B^2

Todos

Add more pixel formats

Add interactive mode & demonize