fbgrab 命令

常用示例

说明

fbgrab reads the Linux framebuffer device (/dev/fb*) or a dump thereof and saves a PNG image file. It can capture screenshots of virtually any application, from traditional text applications to X-windows desktops and framebuffer applications. The tool is particularly useful for capturing screenshots on systems without a running X server, embedded systems, or when working directly with the Linux console.

参数

-?

Display usage information.

-a

Ignore the alpha channel. Useful for pixel formats like BGR32 where drivers incorrectly report alpha.

-b _bitdepth_

The number of bits per pixel. Optional when reading from device.

-c _console_

Specifies which console (virtual terminal) to grab.

-C _console_

Switch console with a delay before capturing.

-d _device_

Framebuffer device to use. Defaults to FRAMEBUFFER environment variable or /dev/fb0.

-f _filename_

Read from file instead of device. Requires -w, -h, and -b options.

-h _height_

The height of the framebuffer in pixels. Optional when reading from device.

-i

Turns off ADAM7 interlacing in the output PNG.

-l _line_length_

Line length (stride) in pixels between the start of each row. Optional when reading from device.

-s _seconds_

Seconds to wait before grabbing the screenshot.

-v

Enable verbose output.

-w _width_

The width of the framebuffer in pixels. Optional when reading from device.

-z _compression_

Set PNG compression level (0=fast, 9=best).