One feature commonly found in websites is a photo gallery. This tutorial will show you a popular Joomla extension called JoomGallery
1) As with all extensions we'll be showing you, start by going to extensions.joomla.org. Then, navigate to the Photos & Images / Photo Gallery category and find the JoomGallery page
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2) Click Download
 
3) Since we have Joomla 1.5, click JoomlaGallery 1.5
 
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As you can see, there are many extensions for this component that you can choose to download at a later date

4) Click the component link
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5) We'll need the installer
 
6) Click Download
 
7) Agree to the terms of the license

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8) Proceed
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9) Save the file to your computer

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Now, it's time to install this extension in Joomla
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For assistance with finding or installing extensions, watch the first two tutorials in this series
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10) Once installed, click Components...
 
11) ...then JoomGallery
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Apparently, an update was released after we downloaded the file. You'll receive update notifications here

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The developer recommends you back up your site before updating JoomGallery, just in case. If you're not sure how to do this, watch the tutorials in the Setup series
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You can choose here to update using a ZIP file or to auto update
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12) Click Start autoupdate
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13) Return to the JoomGallery menu

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Configuration Manager has many options for you to customize, if you want to. Most of the defaults should be just fine
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Check out Help and Information if you run into any problems
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Let's add a category
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14) Click Category Manager
 
15) Click New
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16) Enter a Title
 
17) Type a Description, if you want
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Scroll down and change the access and display settings, if you wish. Then, scroll right
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In the future, you'll be able to choose a Parent Category to put a new category into an existing one
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18) Click Save
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You can see under Owner and Type that the Administrator created this category using the Admin CP

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Now, let's upload some pictures
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19) Click Picture Upload
 
20) Browse for a few pictures

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Scroll down
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21) Choose a category
 
22) Enter a Generic Title to apply to every image

23) Click Upload
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You can save time and upload a compressed ZIP archive of images by using Batch Upload. Or, use images that have already been uploaded with FTP Upload
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Alternatively, you might prefer the Java Uploader over here

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Let's take a look at our two images in the Picture Manager
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24) Click here

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If you encounter any problems with uploads, contact support and have them check PHP's upload_max_filesize for your server. Attempting to upload files larger than the specified size will result in errors
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25) Choose one of the pictures
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26) Change the title or description, if you want, then scroll down

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As you can see, here are are a thumbnail and a larger preview of the picture

27) Scroll back up and click Save
 
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You can also Move a picture to a different category, or Recreate a picture's preview images
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Now let's add a menu link for the gallery
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28) Click Menus
 
29) Go to Top Menu
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Scroll right
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30) Click New
 
31) Select JoomGallery
 
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You'll only find the standard menu item options here; this component's settings are all in its section of the Admin CP
32) Add a Title
 
33) When finished changing the options here, click Save
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Let's see the gallery on our Joomla site
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34) Click Preview
 
35) Click Gallery
 
36) Click here to view the images in this category

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A preview of the first image in the category is displayed here
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37) Click one of the two images

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That's it! You now know how to add a photo gallery to Joomla using JoomGallery