Join Morten Rand-Hendriksen for an in-depth discussion in this video Resizing thumbnails and featured images with a plugin, part of WordPress Themes: Food Blogs.
When you install a new theme that uses featured images, it's important to ensure…that the images in your site are the correct size for that theme.…When you upload an image to WordPress, it will always be resized to fit whatever…theme is currently active. Meaning if you were using a different…theme when you uploaded the images, you won't necessarily have the correct sizes…for the current theme you are using. Resizing the images can be done…automatically with a plug-in. The truly minimal theme, knows this and…when the installation is complete it will remind you to install one of these plugins.…
You can see it right up here in this warning, it says This theme recommends the…following plugins and then suggest the regenerate thumbnails plugin.…If you've already dismissed this notice or you don't have it, you can also find the…same plugin by going to Plugins, click Add New and search for Regenerate Thumbnails.…When you find the plugin, click Install Now to install it, and once the plugin is…installed, click Activate to activate it. Now that this plugin is activated, you can…
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