How to Convert to Grayscale in ImageMagick
Mogrify, the command line component in the free image editing software ImageMagick, allows you to convert any color image file to grayscale by typing a short command in the Windows command prompt. Using this feature, you can convert a color photo in any of the more than 100 image formats that ImageMagick supports to a black and white photo. Use the "-type" operator when running Mogrify to convert the image.
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Instructions
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Open the Start menu, and click "Computer." Double-click the icon for the "C:" hard drive, and then open the "Program Files" and "ImageMagick-6.7.2-Q16" folders. Note that the ImageMagick folder may have a different name if you have a different version of ImageMagick installed.
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Right-click the image that you want to convert to grayscale, and select "Copy." Right-click the ImageMagick folder, and select "Paste." This creates a copy of the image and saves it in the ImageMagick folder.
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Click the address bar at the top of the Windows Explorer window. Press "Backspace" to clear the current contents. Type "cmd" in the address bar and press "Enter." Windows opens a command prompt that begins in the ImageMagick folder.
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Type "mogrify -type grayscale (file name)" and press "Enter." An example of a valid command is "mogrify -type grayscale bliss.jpg." ImageMagick converts the image to a grayscale image. Rename the file before moving it out of the folder to avoid overwriting the original color image.
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