Instantly test your web page with different types of color vision deficiency.

Latest Version

Version
0.3.0
Update
December 27, 2024
Size
22.2KiB
Developer
Category
Users
9,000+
Rating
3.76786 ★
Manifest Version
3
Web Store Status
Languages Support
English
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Permissions
ActiveTab
Scripting
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Spectrum Extension

Color Vision Deficiency (CVD) affects people’s ability to distinguish certain colors. Estimates indicate that approximately 200 million people worldwide are affected by some kind of CVD. Individuals of Northern European ancestry, as many as 8 percent of men and 0.5 percent of women experience the common form of red-green color blindness.

This extension helps you to test web pages for people with different types of CVD. It's particularly useful for websites with data visualisations, because some colors may not be distinguishable from other colors in the charts.

Flash enabled websites are also supported!
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Source Manifest.json

{"update_url": "https://clients2.google.com/service/update2/crx", "manifest_version": 3, "name": "Spectrum", "description": "Instantly test your web page with different types of color vision deficiency.", "version": "0.3.0", "homepage_url": "http://lvivski.com/spectrum", "action": { "default_title": "Spectrum", "default_popup": "popup.html", "default_icon": { "19": "img/action_small.png", "38": "img/action.png" } }, "icons": { "128": "img/icon.png", "48": "img/icon_small.png" }, "web_accessible_resources": [ { "resources": ["img/filters.svg"], "matches": [""] } ], "content_scripts": [ { "matches": [""], "css": [], "js": ["js/filters.js"] } ], "permissions": ["activeTab", "scripting"]}
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How to download and manually install Spectrum extension for Chrome

Looking for a way to install Spectrum 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 Spectrum extensions manually, this article outlines two simple methods to effortlessly install Spectrum extensions, whether they come as unpacked folders in compressed formats like .zip or as .crx files.

Method 1: Download Spectrum extension and manually install through Drag &Drop

If you ever need to manually install a Spectrum 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 Spectrum Extension by clicking the "Download CRX" button on the website.

Look for the Spectrum extension you wish to install. Go to the website and download the Spectrum extension package, which is usually a .CRX file and comes in a zipped file. Here ".crx" file is the format for Spectrum 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 Spectrum 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 Spectrum extension for Chrome and install in Developer Mode

This is another method to install Spectrum 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 Spectrum extension file

Select and download the Spectrum 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 Spectrum 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 Spectrum 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 Spectrum 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 Spectrum extension in 2 ways. We hope this guide proves helpful.

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User reviews

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Najla Nur Ariqah (ID: 00000035c536c722) Voted 5 ★ - Updated 09/03/2021 Actually got recommended to this extension from an article, I just feel i wanted to try it although i don't need it.. But to be honest this extension help my eyes from getting hurt than made it dark theme (i don't really like dark theme, also this is just my opinion). Btw beside of this extension last update is 2017, I saw some people saying this "not working", Idk if this because it's not working on some website or they forgot to refresh page. Because you literally need to REFRESH or RESTART BROWSER anytime after installing an extension. Note: btw on google search, I saw it's working but,, with the low-contrast mode it's make some things of article being highlighted (idk how to describe it) iis that normally like that or..? I don't have problem at all with that I just want to mention that. (here the photo since I am not good at describe thing:https://i.imgur.com/2WSyvmq.jpg)

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Beatriz Albino (ID: 0000009a1e4050eb) Voted 5 ★ - Updated 08/17/2021 Hi there! Is this project open source? could you send me the link? :D

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Archi Cad (ID: 000000bcb677bb05) Voted 2 ★ - Updated 10/10/2019 I'm a color vision expert and I must say this colorblindness simulator has a lot of shortcomings. It shows protanopia red way too dark, as well as deuteranopia red. It also shows protanomaly and deuteranomaly red hues way too reddish than what they truly perceive them. Their reds are much more closer to yellow hues. Tritanomaly simulation is almost the same as normal vision which is totally wrong. Tritanopia simulation is also wrong since it shows that they practicaly see a whole hue circle with some saturation loss, while in reality they only perceive two hues - our reddish pink and cyanish hue. All in all, if you want to use this extension, use only protanopia and deuteranopia simulations since those are the closest to being correct, but keep in mind that reds are represented darker for both types than what they should be, especially for deutans who see red wavelengths much brighter relative to green wavelengths (they still see both colors as yellowish hues) compared to normal vision. Deuteranopia simulation is actually very close to being correct if it was named protanopia, it just needs a slight double grays (around pink and aqua green) position shift.

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Nerdy Maple (ID: 000000c1cc6aecae) Voted 5 ★ - Updated 08/06/2018 I had to restart my computer, but it works. It has a nice range of colour blindness to chose from, and you don't even have to reload the page as it works instantly! I would recommend this to anyone.

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Shadowbandit (ID: 000000f7b3c34380) Voted 3 ★ - Updated 02/16/2018 Works well enough, but I have to reset it every time I change the page. I saw that you were going to update it to where it stays, even after a refresh, but until then, I recommend other extensions, such as colorblinding, which can do the same thing, only it does what your app cannot.