Simple extension to draw a 3 x 3 grid on an image to help visualise the Rule of Thirds.

Latest Version

Version
1.7
Update
June 2, 2024
Size
92.63KiB
Developer
Category
Users
6,000+
Rating
4.4 ★
Manifest Version
3
Web Store Status
Languages Support
English
See more
Permissions
Scripting
ActiveTab
Storage
See more

Rule of Thirds Extension

The is a simple extension to apply a 3 x 3 grid over any images found on a web page which are larger than 100px x 50px. The purpose of the grid is to help photographers visualise the Rule of Thirds.

By displaying the grid over the image it is very simple to identify if a photograph's main focal points comply with the Rule of Thirds or not.

History
--------------------------------------------------------------------------------------------------------------------------------------------

v1.7 - 2 June 2024
* Switch from host_permissions to activeTab (extension does nothing until clicked)
* Position grid correctly for local images (ie file:// protocol)
* Add Options page to control grid size, colours & whether lines and/or circles are rendered
* Support arbitrary sized grid

v1.6 - 21 May 2024
* Migrate to Manifest v3
* Replace JQuery dependency with native functions

v1.5 - 29 August 2014
* Ignore images with \"display: none\" styles
* Fix circles on intersection points so they are drawn fully
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Source Manifest.json

{"update_url": "https://clients2.google.com/service/update2/crx", "manifest_version": 3, "name": "Rule of Thirds", "version": "1.7", "description": "Simple extension to draw a 3 x 3 grid on an image to help visualise the Rule of Thirds.", "icons": { "16": "icon16.png", "48": "icon48.png", "128": "icon128.png" }, "background": { "service_worker": "service_worker.js" }, "permissions": [ "scripting", "activeTab", "storage" ], "options_page": "options/options.html", "action": { "default_icon": { "19": "icon19.png", "38": "icon38.png" }, "default_title": "Add Rule of Thirds grid to images larger than 100 x 50 in either orientation", "name": "Rule of Thirds" }}
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How to download and manually install Rule of Thirds extension for Chrome

Looking for a way to install Rule of Thirds extensions for Chrome, you can search for them in the Chrome Web Store, clicking the "Add to Chrome" button, and following the straightforward process.

However, you may need to install Rule of Thirds extensions manually, this article outlines two simple methods to effortlessly install Rule of Thirds extensions, whether they come as unpacked folders in compressed formats like .zip or as .crx files.

Method 1: Download Rule of Thirds extension and manually install through Drag &Drop

If you ever need to manually install a Rule of Thirds extension for Chrome, don't worry, it's a simple process. Just follow these easy steps, and you will have your extension ready to use in no time.

Step 1: Download the Rule of Thirds Extension by clicking the "Download CRX" button on the website.

Look for the Rule of Thirds extension you wish to install. Go to the website and download the Rule of Thirds extension package, which is usually a .CRX file and comes in a zipped file. Here ".crx" file is the format for Rule of Thirds extension that contains all the data.

Step 2: Extract &Arrange Files

Once the file is downloaded, extract that file into its own folder. Similarly, give that extension files a permanent home. In other words, keep it in a folder that you don't accidentally delete it because these files will be needed to make that extension work.

Step 3: Go to the Chrome Extensions Page

Open Google Chrome and in the address bar, type chrome://extensions; it will open the Google Chrome extensions page. Make sure that "My extensions" is selected in the sidebar.

Step 4: Drag and Drop the Extension

Now, go to the folder where you extracted the Rule of Thirds extension and drag &drop the extension file from there anywhere onto the extension page within Google Chrome.

Step 5: Complete the Installation

Once you drag and drop the extension file, follow the steps that Google Chrome takes you through. Similarly, if the extension file is of .crx file format, you will be required to review the permissions and then add the extension.

Now, you can manage that added extension as you would like to with any other Chrome extension that you added through Chrome Webstore. Its icon will also appear in the Google Chrome Menu on the right side of the address bar once you activate it.

Method 2: Download Rule of Thirds extension for Chrome and install in Developer Mode

This is another method to install Rule of Thirds extension manually, but the twist is that here, you install by enabling the developer mode option provided in Google Chrome. This mode is commonly used for testing extensions or running unpublished tools.

Step 1: Download the Rule of Thirds extension file

Select and download the Rule of Thirds extension by clicking the 'Download CRX' button on the website.

Step 2: Extract the downloaded contents

Convert the file to a ZIP file if it is in CRX format then extract the Rule of Thirds extension zip file or folder that you downloaded. Make sure you extract it using the same folder name and keep it safely in another folder, so you don't delete it by mistake. The extracted folder will be needed to keep your Rule of Thirds extension running.

Step 3: Open Chrome Extension Setting Page

In the address bar of Google Chrome, type chrome://extensions and open the Chrome Extension Page.

Step 4: Enable Developer Mode

After opening the Chrome Extension page, look at the top right side, and you will find the toggle option of "Developer mode."Simply enable that developer mode option.

Step 5: Load the Unpacked Extension

Once you enable the developer mode option, you will see the menu of Load Unpacked, Pack Extensions and Update. From that, select the option "Load unpacked."

Step 6: Select the Extension Folder

Once the pop-up opens upon clicking Load unpacked, select the Rule of Thirds extension directory and click on the "Select Folder "button.

Step 7: Confirm and Install

After you select an extension folder of a Google Chrome extension you're installing manually, confirm its installation for the final time and let the installation complete.

Conclusion

Here we've made a step-by-step guide on How to manually install Rule of Thirds extension in 2 ways. We hope this guide proves helpful.

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User reviews

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Iaroslav Smirnov (ID: 0000003562349392) Voted 3 ★ - Updated 08/19/2023 Add YouTube support

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Max Volodin (ID: 0000008664d5a24d) Voted 5 ★ - Updated 02/12/2021 better than i could've imagine

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MANDEM Steinman-Arendsee (ID: 000000e53a642b7b) Voted 5 ★ - Updated 09/23/2019 I'm telling my photography students about this! These students are just learning to "see" the rule of thirds (and other elements) so they still very much need guidance like this. However, they simply aren't going to spend the time to save images posted in their group discussions and apply the thirds lines to the photos using another program or tool. This is something they can utilize right there on the discussion page without any extra steps, which means they'll actually use it.

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Ankit Sharma (ID: 00000043e65b365e) Voted 5 ★ - Updated 08/31/2019 Amazing this is so good.

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Usef (ID: 00000014db5ed34b) Voted 1 ★ - Updated 03/28/2018 doesn't work