Setting a Different Logo
Changing the logo of a Plone site from the Plone logo is a simple operation, but the steps can get a little confusing, so you should following them carefully.
First, access the ZMI, click portal_skins, click plone_images, and then click logo.jpg. This will open the page for that object.
This
object represents the logo as it's used in Zope. In figure above you can
clearly see information about the image, its size, its type, and its
location on the file system. In the middle of the page is the Customize
button; click it. This will create a copy of the object called logo.jpg in the custom folder.
NOTE: If at this point you get an error message about a bad request, return to portal_skins/custom, and you'll see an object called logo.jpg. Click that object. There can be only one object called logo.jpg
in the custom folder, and the error is warning you that this procedure
has been performed already. If you want to customize the original
object (in other words, repeat these steps), you'll have to delete the
object inside custom.
This page may look similar to the previous page shown, but there are a couple of differences. First, if you look in the top-left corner of the page, you'll see that the meta_type and location of this object has changed. No longer are you in portal_skins/plone_images/logo.jpg; rather, you're in portal_skins/custom/logo.jpg. Second, you'll now see a Browse button that lets you select an image and upload it, meaning you can change this image. Click that button to find your new image, and click Save to commit the changes.
Now return to the Plone interface, and you'll see that the image has changed. To ensure you're seeing the new image, clear your browser's cache (on Internet Explorer, pressing Ctrl+F5 will do this).
What If Your New Image Isn't in JPG Format?
Zope doesn't base the Multipurpose Internet Mail Extensions (MIME) type on the extension but rather on the content. So, you can upload a GIF image into logo.jpg, and it'll still work since the correct MIME type of image/gif is applied. However, you may want to rename the image to logo.gif or logo.png to be less confusing.

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