Convert an Image to Grayscale with ImageMagick

By  on  
Grayscale Logo

A few years ago I bought a DSLR camera with a bunch of filter effects built in and it's been worth every penny.  I took some incredible photos in London, Paris, and Jamaica, and tooks some really special photos of my son during his first few years.  And many of my favorite photos were taken with grayscale filter but some I took in color and badly wanted them in grayscale.  Of course I can use Photoshop to convert the image to grayscale but that's too much work.  I have ImageMagick -- why not use the shell to very quickly convert it to grayscale?

Converting the image to grayscale with ImageMagick is simple:

convert my-image.jpg -colorspace Gray my-image-gray.jpg

The command is self-explanatory and executes in milliseconds.  And since Photoshop takes a few seconds to start and I have to do the work manually, ImageMagick makes everything so much easier.

Recent Features

  • By
    CSS vs. JS Animation: Which is Faster?

    How is it possible that JavaScript-based animation has secretly always been as fast — or faster — than CSS transitions? And, how is it possible that Adobe and Google consistently release media-rich mobile sites that rival the performance of native apps? This article serves as a point-by-point...

  • By
    Write Better JavaScript with Promises

    You've probably heard the talk around the water cooler about how promises are the future. All of the cool kids are using them, but you don't see what makes them so special. Can't you just use a callback? What's the big deal? In this article, we'll...

Incredible Demos

  • By
    Introducing MooTools Dotter

    It's best practice to provide an indicator of some sort when performing an AJAX request or processing that takes place in the background. Since the dawn of AJAX, we've been using colorful spinners and imagery as indicators. While I enjoy those images, I am...

  • By
    MooTools Image Preloading with Progress Bar

    The idea of image preloading has been around since the dawn of the internet. When we didn't have all the fancy stuff we use now, we were forced to use ugly mouseover images to show dynamism. I don't think you were declared an official...

Discussion

  1. MaxArt

    How about sepia tones? After all, it’s just like converting to grayscale with a different balance of red, green and blue.

Wrap your code in <pre class="{language}"></pre> tags, link to a GitHub gist, JSFiddle fiddle, or CodePen pen to embed!