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Defining featured image sizes

From: WordPress: Building Themes from Scratch Using Underscores

Video: Defining featured image sizes

The first step in setting up featured images is to enable I'll set the width of the large-thumb to 1060, and the height to 650.

Defining featured image sizes

The first step in setting up featured images is to enable theme support for post thumbnails and define the featured image sizes. All this is done from functions.php. And you'll remember, all the way back in the beginning of the course, when we set up functions.php, one of the things we enabled was support for post thumbnails or featured images, and we did that by uncommenting this function. Add theme support, post thumbnails. So right now WordPress supports featured images, but we have yet to tell WordPress what size of images we want to be able to use.

Looking back at the design I have two different featured images in my designs. I have this very large featured image that appears in single posts. And also on the top of the index page for the first post, and then I have smaller cropped images that appear on all index pages. Now I need to tell WordPress exactly what sizes these images are, and give them names, so that I can call them in, in the correct places. All this is done by using a function called add_image_size. So if I go say add_image_size, you see here the variables are name, width, height, and crop.

So here, I'll start by giving each image size a name and here I like to give names that actually tell me which images these are. So, I'll call the first one large-thumb so it's a large thumbnail. I'll set the width of the large-thumb to 1060, and the height to 650. And then I have to choose whether or not I want to use a hard crop or a soft crop. If I set the crop value to true then WordPress will take an image that's much larger. Scale it down to match the width, and then crop it to match the height.

That also means if the image is really wide but is not the full height, then the image will just be scaled down. If I set this value to false however and I upload a very, very large image, then WordPress will just take the large image as it is and just display it as 1060 by 650. So in most cases it's a good idea to set this value to true, but if you don't want WordPress to crop the image you may want to set it to false. So, try to experiment with this and see what happens. Then I need to add the second image size, add_image_size again.

I'll give it the name index-thumb because this is the one that will display on index pages. And here the width is going to be 780 pixels and the height is going to be 250 pixels and again the crop is set to true. So now, I'm generating two images. One that's very big. And one that just fits within my content area and is really short. Now, before we continue, let me just give you a quick tip. In some rare cases, you may want the ability to upload feature images. That have variable height and will allow any height of image.

In that case, what you want to do is change the height value here to 9999. That way, WordPress will never crop the height of an image. Well, it'll crop it if it's bigger than 9,999 pixels but that's a very, very large image and you would never use it in a WordPress site. So by setting this value this big. You ensure that no matter what size of image people upload, so that way the height of the object will never be cropped. But, for my purposes, I'm going to set it to 250, save.

And, not WordPress knows what size of image we want.

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This video is part of

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  1. 10m 55s
    1. Welcome
      1m 4s
    2. What to know before you start this course
      2m 40s
    3. How this course and the lesson files work
      3m 12s
    4. Introducing Simone: A preview of the final project
      3m 59s
  2. 21m 28s
    1. Installing and running WordPress on your computer
      3m 53s
    2. Getting and installing Underscores
      4m 11s
    3. Installing WordPress Theme Unit Test data
      4m 18s
    4. Installing the Developer plugin
      2m 58s
    5. Installing and setting up NetBeans or another IDE
      6m 8s
  3. 16m 15s
    1. Designing for mobile, content, and style
      4m 52s
    2. How do WordPress themes work?
      4m 48s
    3. Understanding the WordPress template hierarchy
      2m 19s
    4. Underscores: An overview
      4m 16s
  4. 37m 5s
    1. Setting up style.css
      4m 47s
    2. Configuring baseline settings and functions
      6m 6s
    3. Enabling custom fonts and font icons
      5m 44s
    4. Applying global styles
      5m 11s
    5. Styling basic layout components
      6m 19s
    6. Making the site layout responsive
      8m 58s
  5. 23m 18s
    1. Styling the default header
      6m 25s
    2. Hiding the site title and tagline
      5m 32s
    3. Adding an optional header image function
      5m 23s
    4. Placing the header image behind the site title
      5m 58s
  6. 40m 55s
    1. Setting up menus
      3m 12s
    2. Styling the menu
      7m 42s
    3. Using Superfish for accessible menus
      8m 0s
    4. Making the menu responsive
      7m 3s
    5. Creating a custom social media menu
      5m 51s
    6. Styling the menu with icons from Font Awesome
      9m 7s
  7. 18m 9s
    1. Adding the search form
      6m 27s
    2. Adding the search icon
      6m 55s
    3. Adding show/hide functionality to the search form with jQuery
      4m 47s
  8. 33m 20s
    1. Adding a widgetized area to the footer
      7m 10s
    2. Using the Monster widget plugin to test all widgets
      2m 11s
    3. Styling the footer
      3m 6s
    4. General widget styling
      5m 33s
    5. Adding custom styles to specific widgets
      7m 34s
    6. Using Masonry to make footer widgets responsive
      7m 46s
  9. 54m 49s
    1. Changing the Single Post Template content structure
      5m 54s
    2. Changing the output of meta elements
      7m 2s
    3. Styling the Single Post Template
      7m 57s
    4. Making post meta responsive
      6m 21s
    5. Styling blockquotes
      5m 39s
    6. Creating pull quotes and pull images
      5m 1s
    7. Working with image captions
      4m 27s
    8. Working with image galleries
      4m 57s
    9. Single-post navigation
      7m 31s
  10. 30m 23s
    1. Working with the comments template
      8m 42s
    2. Using Gravatars in comments
      2m 42s
    3. Styling comments
      7m 26s
    4. Highlighting post author comments
      3m 36s
    5. Styling the comment form and messages
      7m 57s
  11. 18m 43s
    1. How do featured images (post thumbnails) work?
      2m 57s
    2. Defining featured image sizes
      3m 30s
    3. Generating new featured images with a plugin
      1m 46s
    4. Adding featured images to a template
      5m 7s
    5. Styling the featured image
      5m 23s
  12. 1h 2m
    1. The index template hierarchy
      2m 21s
    2. Customizing and styling index templates
      10m 10s
    3. Displaying excerpts or full content on index pages
      3m 6s
    4. Adding a custom Read More link
      3m 48s
    5. Adding featured images
      4m 0s
    6. Creating custom pagination navigation
      6m 4s
    7. Highlighting Sticky Posts
      2m 55s
    8. Creating custom post format templates
      5m 30s
    9. Highlighting the most recent post in the index template
      7m 22s
    10. Embracing modular design
      2m 29s
    11. Working with archive.php
      5m 54s
    12. Customizing the search results and the 404 template
      8m 28s
  13. 9m 7s
    1. Styling pages
      3m 4s
    2. Creating custom page templates
      6m 3s
  14. 4m 30s
    1. Adding editor styles to match front-end styles
      4m 30s
  15. 2m 20s
    1. Further learning
      2m 20s

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