Convert Image to grayscale with Imagemagick

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The easiest way to convert images to grayscale ( graylevel ) is by using "imagemagick" the image manipulation programs suite. Use the commands below to install imagemagick installed on your Linux system if you have not done so yet:
Fedora/Redhat 
# yum install imagemagick
Ubuntu/Debian 
# apt-get install imagemagick

1. Convert Image to grayscale

The procedure to convert color to grayscale it simple. Here is our original color image which needs to be converted to grayscale:


now we convert the above image to grayscale: 
$ convert linuxcareer-color.png -colorspace gray linuxcareer-color-grayscale.png


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