Home
>
Web Design
>
Hexadecimal Color Notation on the Web

Hexadecimal Color Notation on the Web

When designing elements for your webpage, you will often be called upon to specify a color. For example, the code for a span shown below specifies that the color of the text within the span will be yellow.

Text

Colors can be specified according to their names, for example "yellow", "green", or "blue". In many cases, these simple color names will work. But what if you want to specify a more sophisticated color like "cornflowerblue"? A particular browser may not recognize a particular color name. It's more reliable to specify colors with an "RGB triplet".

An RGB triplet specifies a color based upon the amounts of red, green, and blue, on a scale from 0 to 255, required to create the color. For example, to create the color cornflowerblue you need red=100, green=149, and blue=237. We could then specify the color of the text within a span using the rgb function as shown below.

Text

This will work fine with style notation, but what if you want to use straight html. Html doesn't recognize the rgb function. In that case, you can specify color using "hexadecimal" notation. Whereas the decimal numbering system uses the characters 0 through 9 to get 10 values, the hexadecimal numbering system uses the characters 0 through f to get 16 values. (After 9 the characters a, b, c, d, e and f are used, as shown below.)

Decimal Hexidecimal Equivilants

dec hex

0 = 0

1 = 1

2 = 2

3 = 3

4 = 4

5 = 5

6 = 6

7 = 7

8 = 8

9 = 9

10 = A

11 = B

12 = C

13 = D

14 = E

15 = F

On first appearance, this looks pretty simple but you need two hexadecimal characters to represent all decimal values from 0 to 255. When you increment decimal 9 by 1, you change the 9 to 0 and put 1 in the ten's place. When you increment hexidecimal F by one, you change the F to 0 and put 1 in the "sixteens" place. Sometimes it's not easy to convert between decimal and hexadecimal in your head.

RGB Triplet for Cornflowerblue

color dec hex

red 100 64

green 149 95

blue 237 ED

We could then specify the color of text within a span using the hexadecimal notation as shown below.

Text

Note that when we indicate the use of hexadecimal notation by placing a pound (#) sign in front of the number, and we don't use commas to separate the color components.

If it's not easy to convert between decimal and hexadecimal in your head, then how do you do it? You can use a calculator that has a decimal to hexadecimal coversion function, or you can learn to think in hexadecimal. For example, what's the next number after CE? That would be CF. what's the next number after CF? That would be D0. Which hexadecimal number is higher 99 or B2? B2 would be higher than 99. It gets easier with experience.

Here's Java Script code for a simple decimal to hexidecimal color converter

function convert(decvalue)

{

var num = parseInt(decvalue);

if(num >= 0 && num < 256)

{

var hexnum = num.toString(16);

alert("#" + hexnum);

}

else {alert("Error!");}

}

It's important to use hexadecimal notation to specify colors when you use DHTML with visual effects, because to create a dynamic color change you have to increment or add a value to a color. The vast amount of color specification on webpages is in hexadecimal notation, so it would be wise to become familiar with it.

Permission is granted for the below article to forward, reprint, distribute, use for ezine, newsletter, website, offer as free bonus or part of a product for sale as long as no changes are made and the byline, copyright, and the resource box below is included.

About The Author

To learn how to maintain your computer and use it more effectively to design a Web site and make money on the Web visit bucarotechelp.com. To subscribe to Bucaro TecHelp Newsletter visit bucarotechelp.com

Oak Lawn bmw rental chicago .. Lockport Chicago limo O’Hare

In The News:

Toll road text scam: Fake messages claim unpaid fees, seek payment via fraudulent links. Kurt “CyberGuy" Knutsson says this scam is becoming increasingly sophisticated and widespread.

Kurt “CyberGuy" Knutsson says these steps ensure that your friends and family get to the exact moment you want them to see. Try it out and streamline your sharing experience.

Tech expert Kurt “CyberGuy" Knutsson offers tips on how to protect your identity: Be vigilant, monitor accounts, use smart security, know theft response.

Tech expert Kurt “CyberGuy" Knutsson says cybercriminals are exploiting iMessage phishing protection, tricking users to reactivate links.

It's hard to imagine life without in-flight Wi-Fi these days – but sky-high web surfing comes with its own set of privacy concerns. Here's how to protect yourself.

Over 400,000 cases of credit card fraud were reported in 2024 to the Federal Trade Commission. The CyberGuy explains how to protect against becoming another victim.

A nondescript metal box transforms into a fully functional electric motorcycle that blurs the line between vehicle and urban infrastructure.

Many apps unrelated to location still ask users for tracking permission, and Texas Attorney General Ken Paxton has filed a lawsuit seeking to end this alleged practice by Allstate.

Stay up to date on the latest AI technology advancements and learn about the challenges and opportunities AI presents now and for the future.

Melody, the artificial intelligence-powered robot, is life-sized and represents a move toward creating robots that resemble people in appearance and interaction.

Here are five easy smartphone rules from the National Security Agency that you can follow to better protect your mobile device from hackers and scammers.

A U.S. robotics company has developed "Jennie," a robotic pet powered by artificial intelligence that's designed to comfort those facing mental health challenges.

Healthcare records for more than 184 million Americans were breached in 2024, but you can take steps to minimize that risk. Kurt the CyberGuy explains.

The Skyrider X1 from Rictor claims to be the "first amphibious flying passenger motorcycle," and it combines land and air travel in one sleek design.

Stay up to date on the latest AI technology advancements and learn about the challenges and opportunities AI presents now and for the future.

Home inventory and restoration apps help itemize and track every item in your home in the event you have to make an insurance claim after a natural disaster.

The White House launched a new cybersecurity safety label, the U.S. Cyber Trust Mark, intended to help consumers make informed decisions on smart device safety.

Today's tech can help make life so much easier — if you know how to use it. Here are a few tips on the quickest and best ways to make your phone, laptop and other devices work for you.

Tech expert Kurt “CyberGuy" Knutsson offers Windows 11 restart fixes: Update drivers, run system scans and check hardware.

Sony and Honda's Afeela 1 EV launches with advanced tech and entertainment for $89,900. Tech expert Kurt “CyberGuy" Knutsson gives his takeaways.

With limited hard drive space, tech expert Kurt “CyberGuy" Knutsson offers these tips for storing large video files and photos.

Tech expert Kurt “CyberGuy" Knutsson says the $236,000 Yangwang U9 electric hypercar boasts 1,287 horsepower and can jump obstacles.

Flip phones are harder to block spam calls from, but it's not impossible. Kurt the "CyberGuy" explains how to stop incoming robocalls on your flip phone.

With so many notifications buzzing our phones these days, it's tough to distinguish between legitimate messages and possible scams. Kurt the CyberGuy helps unravel the mystery.

Scammers have a new trick where they pretend to be job recruiters to plant malicious apps on your devices. It all starts with a deceptive email.

Hexadecimal Color Notation on the Web

Web Design