You can configure several global settings related to the media files you upload and publish on your blog from the Media Settings page, shown in Figure 7-15. This page is accessible through the Settings, Media link in the left menu of your WordPress dashboard.
Figure 7-15 Configure global settings for media files used in your blog.
Image sizes When you upload images to insert into your posts and pages, you can choose to display them at full size, medium size, or as thumbnails. Enter values for the maximum width and height for each size option. WordPress will auto-size your uploaded images.
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