Imagemagick Macos Catalina

2/13/2022by admin
  1. Macos Catalina 10.15.7
  2. Install Imagemagick Macos Catalina

Oct 16, 2019 First, install imagemagick itself. This is needed to get the source files you’ll use later to compile the PHP extension with. $ brew install pkg-config imagemagick. This will also install the needed pkg-install dependency. Compile Imagick PHP extension with pecl. Next up, use pecl to get the PHP extension compiled. Congratulations, you have a working ImageMagick distribution under Mac OS X and you are ready to use ImageMagick to convert, compose, or edit your images or perhaps you'll want to use one of the Application Program Interfaces for C, C, Perl, and others Ran into the depreciation today and the recommendation is buried at the end of Homebrew. With Apple adding Dark Mode to the upcoming iOS (13) I see this trend increasing in its popularity. The current Mac OS (Mojave) and current Windows OS (10) support Dark Mode themes. Several web browsers are supporting Dark Mode detection when using. Fix A Smelly Garbage Disposal Fast and Cheap. First, install imagemagick itself. This is needed to get the source files you’ll use later to compile the PHP extension with. $ brew install pkg-config imagemagick. This will also install the needed pkg-install dependency. Compile Imagick PHP extension with pecl. Next up, use pecl to get the PHP extension compiled. This is an update for April 2019, Mac OSX mojave 10.14.4 discussion on reddit. It seems that the cocoa option is not available on hombrew also the -head. So you can: brew cask install emacs #is the preferred from emacs wiki brew install -cask emacs #using new cask syntax.

In my recent post A new set of Hubble deep space iMac retina desktops, I included a set of auto-cropped 5120x2880 desktops. In that post, I wrote:

These images were automatically cropped from the master image (after I cropped that; more detail on what I did is coming in a follow-up post), via ImageMagick.

So this would be that post: How to auto-crop huge images using ImageMagick. If you're not familiar with it, ImageMagick is a set of command-line tools to manipulate images. There are a number of ways to install ImageMagick, but I used Homebrew (brew install imagemagick).

ImageMagick has way too many features to describe here (check the partial list on its site), but the one I was interested in was tile cropping, which subdivides one large image into many smaller images. There are many ways to do auto-cropping, but I just wanted the most basic: For a given input image, create multiple output files using a predefined crop size (5120x2880). That command looks like this:

convert hubble_huge.png -crop 5120x2880 -quality 80% hubble-%d.jpg

Most of this is self-obvious, but the last bit, hubble-%d.jpg, looks a bit odd. This is the output filename, and the %d appends a sequential digit to make each filename unique.

Aside: The %d isn't an ImageMagick feature; instead, convert supports printf parameters. For example, I could have instead used %03d, which would have forced a three-digit sequence number, padded with leading zeros.

I originally auto-cropped the full Hubble image, which is irregularly shaped. As a result, I got a lot of non-usable images, due to either white boundary lines running through them or due to their position near the right or bottom edge (where it's not possible to get a full-size crop). I think there were only about ten usable images when I auto-cropped the original image.

To make the auto-crop work better, I first cropped the original image to a true square, as seen here:

Macos

Macos Catalina 10.15.7

Macos

(I left the one jutting out bit at the bottom as it's an isolated cutout, so it only results in two bad images.) This increased the number of usable images to the 27 found in the final post.

If you've never used ImageMagick, and are comfortable with the command line, it's a very useful set of image utilities.

Install Imagemagick Macos Catalina

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