java barcode reader open source 3: Color in Java

Maker Denso QR Bar Code in Java 3: Color

3: Color
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some design software applications may still warn you when you select a color that is not websafe for use in a web graphic You can easily recognize web-safe colors by their hexadecimal values Each of the websafe colors has RGB values that are multiples of 51 So, every color in the 216-color web-safe palette has a hex value made up of the values shown next
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0 51 102 153 204 255
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00 33 66 99 CC FF
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The color selected in this illustration is not web-safe This is evident because the green value is #55, which is not a web-safe hex value To make this color web-safe, you would have to change the green value to #66
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This symbol warns that the color currently selected is not web-safe Clicking the square box next to the cube causes Photoshop to change the color to the nearest web-safe color Photoshop s color window has little black lines along each of the three color bars (red, green, and blue) to show where the web-safe values are
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Specify Document Colors
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The preferred method of changing document colors, such as the background and the text, is with style sheets As with any style declaration, you can specify the background, text, and link colors in either an inline, internal, or external style sheet The actual properties used to do so are the same, however, regardless of which type of style sheet you use Unlike with the older HTML tags previously used to change document colors, with CSS you aren t restricted to specifying this information within the body tag In fact, you actually use the a tag (which is used to add links to a web page) to change link colors in CSS To understand, look at the following example of an internal style sheet:
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<style type="text/css"> body {background-color: white; color: gray;} a:link {color: blue;} a:visited {color: purple;} a:active {color: orange;} </style>
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NOTE
Remember, internal style sheets are those placed in between the opening and closing head tags in the HTML code of your web page
With CSS, you have to consider which tag actually creates the content whose color you want to change, and use that as your CSS selector So, in the preceding internal style sheet example, I first tell the browser to change the background color of the entire page to white (the body tag determines the underlying features of a page, such as background color and default text color) Adding the color property to the body selector also specifies that all text on the page should be, in this case, gray Next, I m telling the browser to select all content affected by a tags (a:link) and make them blue When those links have been visited, I want the browser to render them as purple, as indicated by the line a:visited {color: purple;} And, finally, the color of active links that is, the color visible when the user is clicking a link is orange, as defined by the line beginning with a:active
Although we used the same property color to change the default text color and the various link colors, remember that it is the selector (in this case body and a) that tells the browser exactly which color to alter
On the Horizon
One of my favorite upcoming aspects of web development is transparency In the upcoming CSS3 specification, the W3C has defined two new ways to create transparency in web pages
RGBA
Once browsers start to support RGBA, you'll be able to specify the alpha value or the transparency of a color The transparency is defined by a number between 00 (completely transparent) and 10 (fully opaque) For example, you might use the following code to tell the browser to display a headline at 50 percent of the defined color
h1 {color: rgba(255,68,253,05);}
As of this writing, the latest versions of Safari, Firefox, and Google Chrome all support RGBA color specification Unfortunately, Internet Explorer still does not support this alpha transparency So while it s a fun bit of code to play with, I don't recommend using it for large web audiences until it s fully supported In the meantime, if you really want to use alpha transparency on your pages, check out this link for a great IE work-around: http://css-tricks com/rgba-browser-support/
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