Both are commands from ImageMagick: convert and composite. What was once a matted knot of commands is now reduced to two. Let's now look at the full command with this data put in: convert -size 680x100 -background '#00000080' -fill white caption:"Bristol,United Kingdom" miff:- | composite -gravity south -geometry +0+3 - IMG_20170504_ The final sed removes the last character, which is a comma.įigure 2: The caption in the finished image means we'll never forget where we took the picture, and we can be confident that we can share it online without telling everyone where we live. We would like them comma-separated, so use tr to first delete the quote marks, and then replace the newlines with commas. This gives us the town and country on different lines ( Figure 2). If the address_components item has a type of country or town, output the long_name. The format for jq is a language in itself, but what we do is get the first item in the results list, and then loop through the address_components list inside this item. We then use the jq command (which you may need to install via your package manager) to get the data we want out of this. By default, you're limited to 2,500 daily requests from the API, so if you have a lot of images, you may need to spread them out over several days. The first part of this pipe uses the Google Maps API to get the closest address for this latitude and longitude in JSON format. The second command substitution is a little more complex ( Listing 2).Īs you can see, we've put 1.0000,1.0000 where the previous command placed the latitude and longitude of the picture. Obviously, you'll need to change the image name to an image you have. To test this command substitution, run it without the first dollar sign or opening and closing brackets. This uses the identify command (part of ImageMagick, so you might need to install this package via your package manager) to extract the width of the image. Let's first look at the command substitutions. Command substitution runs the command inside the brackets and inserts the text that the command outputs in the place of the dollar sign. In some cases, we use this to send text from one command to the next in other cases, we're sending images. The pipe sends the output of one command to another. The two basic building blocks of this command are the pipe ( |) and command substitution ($()). Let's break it down and look at it bit by bit. It's made up of lots of smaller bits that are all easy to understand.
Obviously, this command is a little complex, but don't worry.
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