Linux 如何通过命令行将图像转换为灰度？
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How can I convert an image to grayscale via the command line?
提问by cwd
How can I use sips, imagemagic, or another tool to convert an image to black and white (grayscale) via the command line?
如何使用sips、imagemagic或其他工具通过命令行将图像转换为黑白（灰度）？
采纳答案by mark
If you have imagemagickinstalled,
如果你已经imagemagick安装，
convert source.jpg -colorspace Gray destination.jpg (true grayscale only)
convert source.jpg -monochrome destination.jpg (true black and white)
convert source.jpg -separate destination.jpg (separate into gray channels)
If you don't care about losing the original file: mogrify -colorspace Gray file.
如果您不在乎丢失原始文件：mogrify -colorspace Gray file.
回答by imm
use one of: -monochromeor -colorspace grayoptions for imagemagick(convert).
使用以下选项之一：-monochrome或( )-colorspace gray选项。imagemagickconvert
