java barcode reader example download Creating a Transparent GIF in Software

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Creating a Transparent GIF
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A transparent GIF has areas that are transparent, so that the web page background on which the image sits shows through the GIF In order to create a transparent GIF, you ll need to know what color your web page background will be If you create a transparent GIF on a white background, then move it to a colored background, an undesirable halo effect occurs around the image, as shown in Figure 10-3 If you ll be using a pattern as a web page background, use the darkest color in the background to fill the background of your image when creating a transparent GIF, especially if you have glows or drop shadows
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How to Do Everything with Photoshop 7
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FIGURE 10-3
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Undesirable halo effect in transparent GIF
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To create transparency in your image, follow these steps:
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1 Flatten the layers in your image by selecting Layer | Flatten Image 2 Use the eraser tool, background eraser, or magic eraser tools, as described in
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5, to delete the parts of the image that you want to make transparent Photoshop and ImageReady both display transparency with the checkerboard pattern, as shown in Figure 10-4
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3 In ImageReady, use the Optimize
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palette to select the settings for the GIF In Photoshop, use Save for the Web, or select Image | Mode | Indexed, and make sure the transparency checkbox is selected, as shown here
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4 In ImageReady, select File | Save
Optimized In Photoshop, select File | Save, and be sure that the Filetype is set to GIF
CHAPTER 10: Creating Graphics for the Web
FIGURE 10-4
Selecting a transparent background
Creating an Image Map
An image map is an image in which you create clickable areas that link to different web pages One of the most obvious uses of an image map is to create a map of the world, for instance, where each country s outline is linked to a different page of information Creating an image map is the only way to link a single image to more than one page
Using the Image Map Tools
With the Image Map tools, you can create rectangular, circular, or polygon shapes Make sure the Image Map palette is open in ImageReady Select Window | Image Map if the palette is not open
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Select one of the Image Map tools, as shown on the left Click and drag to outline the area you wish to make a clickable link When you have finished outlining the image map shape, in the URL box, enter the path to the HTML page you want to link to ImageReady automatically names the slice, which you can rename to something more descriptive, as shown below
It s a good idea to type in descriptive text for the ALT tag, which will show up in the web browser when the user moves the cursor over the image, as shown in Figure 10-5 If you need to move or change the image map, use the image map selection tool To access this tool, click and hold on the image map tool When you have finished creating various links, save the file by selecting File | Save Optimized Preview the image in a web browser by selecting the preview button in the ImageReady toolbox
CHAPTER 10: Creating Graphics for the Web
FIGURE 10-5
Descriptive text using the ALT tag as it appears in a browser
Creating an Image Map from Slices
You can use the slice tool to cut a large graphic into smaller individual graphics ImageReady automatically creates the HTML that puts the slices into place when you select File | Save Optimized To create an image map from slices, you ll want to make sure that the Slice palette is open in ImageReady Select the slice tool from the ImageReady toolbox, and use it to create a rectangular slice In the Slice palette, type the path to the web page
How to Do Everything with Photoshop 7
Making Rollover Buttons
One way to add interactivity to your web site is to create rollover buttons When a visitor to your web site moves his cursor over a button or clicks a button, the button can change color, shape, bevel, drop shadow, glow, and so on Rollovers aren t just for buttons you can use them to highlight an image when it s rolled over
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