# Painting

This chapter is from the book

## Working with Color

SVG's color handling is similar to HTML; many of the same terms and properties are shared between the two markup languages. Developers can designate color values through several methods. Two of the most common methods are: 1) using a color's name or 2) using a color's RGB hexadecimal value.

In the previous examples, you've used the first method by designating a color by its name. It's important to note, however, that not just any color name will work. A set of color keywords has been defined by the W3C and is viewable in the appendix of this book.

Color keywords are great for quick designation of a color. However, they are often not the precise color that a designer is looking for. Hexadecimal notation of color offers a greater number of possibilities for defining an RGB color than the keyword method.

As nearly all designers and developers who have created images for the Web are already familiar with hexadecimal notation, this book will not attempt to provide a tutorial on the subject. Still, a cursory overview of the notation is in order to serve as an explanation of how this book will refer to color values.

For those unfamiliar with hexadecimal notation, a quick refresher course should help. Color on a monitor is defined by mixing three color channels: red, green, and blue (known as "RGB"). Each channel has 256 levels, allowing for a total of 16,777,216 possible colors. Traditionally, screen colors were represented as three values, based on the level value of each channel. For instance, to create a solid blue hue, you would define the color as (0r, 0g, 255b).

To offer an alternative to defining color using this nine number structure, the hexadecimal system was adopted.

Each channel's 3-digit level value can be condensed to two characters, using the numbers 0 through 9 and the letters A through F. By combining two of these characters, you can represent any channel value. The combination of characters to equal a 3-digit value is based upon a mathematical calculation.

Most designers do not think in terms of RGB values, much less in terms of the hexadecimal notation of such values. Rather, they use their design program's color "pickers," a palette or interface that allows a color to be created by adjusting its levels of red, green, and blue. In many cases, though, the same program can display the determined color's value in hexadecimal notation (a select set of colors defined with this notation—216 colors to be precise—is sometimes referred to as "Web-safe" colors) by changing a setting in the color picker.

Adobe PhotoShop and Illustrator, Macromedia FreeHand, Corel Draw, Jasc WebDraw, and many other image creation programs have such an ability. If you do not own one of these tools, you can still find a color's hexadecimal notation through one of these many methods:

• Apple's Macintosh operating system has a system-wide color picker (available in almost any Mac program that allows you to select colors) with an "HTML Picker." Once accessed, you can hold the "option" key to convert your cursor into an "eyedropper" capable of capturing any color on screen. After clicking on a color with the eyedropper, the HTML Picker will display its hexadecimal value in a form field that you can copy and paste into your code.

• You can use Kresch.com's Java RGB Color Tester tool free-of-charge online at http://kresch.com/resources/javacolor.htm. This Java applet is an incredibly useful tool for those without a design program, as it visually adjusts the color of the applet according to three sliders (red, green and blue). Both the traditional RGB values and hexadecimal values are displayed as you adjust the sliders.

• A limited list of colors, their RGB values, their RGB hexadecimal notation, and their color "keywords" are listed in the appendix of this book.

• Lastly, you can visit this book's companion site, http://www.svgnow.com. You will be able to find up-to-date links to free hexadecimal notation converters for several operating systems at the site.

Again, SVG can accept a variety of ways to specify a color. If you are trying to quickly apply a color and don't know the hexadecimal value, you can simply use an accepted color name. Most likely, however, if you are an experienced Web developer, you will use the hexadecimal notation for describing a color's RGB value. Thus, the remainder of this book will use hexadecimal notation for defining RGB color values.

### InformIT Promotional Mailings & Special Offers

I would like to receive exclusive offers and hear about products from InformIT and its family of brands. I can unsubscribe at any time.

## Overview

Pearson Education, Inc., 221 River Street, Hoboken, New Jersey 07030, (Pearson) presents this site to provide information about products and services that can be purchased through this site.

This privacy notice provides an overview of our commitment to privacy and describes how we collect, protect, use and share personal information collected through this site. Please note that other Pearson websites and online products and services have their own separate privacy policies.

## Collection and Use of Information

To conduct business and deliver products and services, Pearson collects and uses personal information in several ways in connection with this site, including:

### Questions and Inquiries

For inquiries and questions, we collect the inquiry or question, together with name, contact details (email address, phone number and mailing address) and any other additional information voluntarily submitted to us through a Contact Us form or an email. We use this information to address the inquiry and respond to the question.

### Online Store

For orders and purchases placed through our online store on this site, we collect order details, name, institution name and address (if applicable), email address, phone number, shipping and billing addresses, credit/debit card information, shipping options and any instructions. We use this information to complete transactions, fulfill orders, communicate with individuals placing orders or visiting the online store, and for related purposes.

### Surveys

Pearson may offer opportunities to provide feedback or participate in surveys, including surveys evaluating Pearson products, services or sites. Participation is voluntary. Pearson collects information requested in the survey questions and uses the information to evaluate, support, maintain and improve products, services or sites, develop new products and services, conduct educational research and for other purposes specified in the survey.

### Contests and Drawings

Occasionally, we may sponsor a contest or drawing. Participation is optional. Pearson collects name, contact information and other information specified on the entry form for the contest or drawing to conduct the contest or drawing. Pearson may collect additional personal information from the winners of a contest or drawing in order to award the prize and for tax reporting purposes, as required by law.

If you have elected to receive email newsletters or promotional mailings and special offers but want to unsubscribe, simply email information@informit.com.

### Service Announcements

On rare occasions it is necessary to send out a strictly service related announcement. For instance, if our service is temporarily suspended for maintenance we might send users an email. Generally, users may not opt-out of these communications, though they can deactivate their account information. However, these communications are not promotional in nature.

### Customer Service

We communicate with users on a regular basis to provide requested services and in regard to issues relating to their account we reply via email or phone in accordance with the users' wishes when a user submits their information through our Contact Us form.

## Other Collection and Use of Information

### Application and System Logs

Pearson automatically collects log data to help ensure the delivery, availability and security of this site. Log data may include technical information about how a user or visitor connected to this site, such as browser type, type of computer/device, operating system, internet service provider and IP address. We use this information for support purposes and to monitor the health of the site, identify problems, improve service, detect unauthorized access and fraudulent activity, prevent and respond to security incidents and appropriately scale computing resources.

### Web Analytics

Pearson may use third party web trend analytical services, including Google Analytics, to collect visitor information, such as IP addresses, browser types, referring pages, pages visited and time spent on a particular site. While these analytical services collect and report information on an anonymous basis, they may use cookies to gather web trend information. The information gathered may enable Pearson (but not the third party web trend services) to link information with application and system log data. Pearson uses this information for system administration and to identify problems, improve service, detect unauthorized access and fraudulent activity, prevent and respond to security incidents, appropriately scale computing resources and otherwise support and deliver this site and its services.

This site uses cookies and similar technologies to personalize content, measure traffic patterns, control security, track use and access of information on this site, and provide interest-based messages and advertising. Users can manage and block the use of cookies through their browser. Disabling or blocking certain cookies may limit the functionality of this site.

### Do Not Track

This site currently does not respond to Do Not Track signals.

## Security

Pearson uses appropriate physical, administrative and technical security measures to protect personal information from unauthorized access, use and disclosure.

## Children

This site is not directed to children under the age of 13.

## Marketing

Pearson may send or direct marketing communications to users, provided that

• Pearson will not use personal information collected or processed as a K-12 school service provider for the purpose of directed or targeted advertising.
• Such marketing is consistent with applicable law and Pearson's legal obligations.
• Pearson will not knowingly direct or send marketing communications to an individual who has expressed a preference not to receive marketing.
• Where required by applicable law, express or implied consent to marketing exists and has not been withdrawn.

Pearson may provide personal information to a third party service provider on a restricted basis to provide marketing solely on behalf of Pearson or an affiliate or customer for whom Pearson is a service provider. Marketing preferences may be changed at any time.

## Correcting/Updating Personal Information

If a user's personally identifiable information changes (such as your postal address or email address), we provide a way to correct or update that user's personal data provided to us. This can be done on the Account page. If a user no longer desires our service and desires to delete his or her account, please contact us at customer-service@informit.com and we will process the deletion of a user's account.

## Choice/Opt-out

Users can always make an informed choice as to whether they should proceed with certain services offered by InformIT. If you choose to remove yourself from our mailing list(s) simply visit the following page and uncheck any communication you no longer want to receive: www.informit.com/u.aspx.

## Sale of Personal Information

Pearson does not rent or sell personal information in exchange for any payment of money.

While Pearson does not sell personal information, as defined in Nevada law, Nevada residents may email a request for no sale of their personal information to NevadaDesignatedRequest@pearson.com.

## Supplemental Privacy Statement for California Residents

California residents should read our Supplemental privacy statement for California residents in conjunction with this Privacy Notice. The Supplemental privacy statement for California residents explains Pearson's commitment to comply with California law and applies to personal information of California residents collected in connection with this site and the Services.

## Sharing and Disclosure

Pearson may disclose personal information, as follows:

• As required by law.
• With the consent of the individual (or their parent, if the individual is a minor)
• In response to a subpoena, court order or legal process, to the extent permitted or required by law
• To protect the security and safety of individuals, data, assets and systems, consistent with applicable law
• In connection the sale, joint venture or other transfer of some or all of its company or assets, subject to the provisions of this Privacy Notice
• To investigate or address actual or suspected fraud or other illegal activities
• To exercise its legal rights, including enforcement of the Terms of Use for this site or another contract
• To affiliated Pearson companies and other companies and organizations who perform work for Pearson and are obligated to protect the privacy of personal information consistent with this Privacy Notice
• To a school, organization, company or government agency, where Pearson collects or processes the personal information in a school setting or on behalf of such organization, company or government agency.

This web site contains links to other sites. Please be aware that we are not responsible for the privacy practices of such other sites. We encourage our users to be aware when they leave our site and to read the privacy statements of each and every web site that collects Personal Information. This privacy statement applies solely to information collected by this web site.