ptg 456 Chapter 19 The PNG-24 file format is used primarily for images that contain lots of colors with soft transitional edges, such as photographs, and was designed as an alternative to the JPEG file format. The PNG-24 format generates an image with millions of colors, and still manages to reduce the size of a file. While similar to the JPEG file format, the PNG-24 uses lossless compression, and does not compress files as small as the JPEG format. So for the time being, most designers are still using the JPEG format for creating faster-loading web graphics. Optimizing a PNG-24 Document Optimize a PNG-24 Document Open a document. Click the File menu, and then click Save For Web & Devices. Click the Original, Optimized, 2-Up, or 4-Up tabs to view the document using different layouts. Click one of the sample images to change its default format. Click the Optimized File Format list arrow, and then click PNG-24. Select from the following options: Transparency Options: ◆ Transparency. Check to keep the transparent areas of a PNG-24 image transparent. ◆ Matte. Click to fill the trans- parent areas of a PNG-24 image. Other Options: ◆ Interlaced. Check to have the PNG-24 image load in three scans. Click Save to save the current image using the Save Optimized As dialog box. 7 6 5 4 3 2 1 3 4 6 5 7 From the Library of Wow! eBook ptg Chapter 19 Designing for the Web and Devices 457 The WBMP file format is used for images that are displayed on small hand-held devices such as PDAs and cell phones. The WBMP format generates an image with only 2 pixel colors (black and white), which significantly reduces the file size of the image. The WBMP for- mat is new to the world of wireless devices, and while it creates small images, using only black and white pixels results in very low-quality images. Optimizing a WBMP Document Optimize a WBMP Document Open a document. Click the File menu, and then click Save For Web & Devices. Click the Original, Optimized, 2-Up, or 4-Up tabs to view the document using different layouts. Click one of the sample images to change its default format. Click the Optimized File Format list arrow, and then click WBMP. Select from the following options: ◆ Method. Click the list arrow, and then select from the available dithering schemes (None, Diffusion, Pattern, or Noise). Dithering is how the WBMP format mixes the available colors in the image. ◆ Amount. Enter or select a value from 0% to 100% to instruct the WBMP compression utility how many of the image’s colors should be dithered. Click Save to save the current image using the Save Optimized As dialog box. 7 6 5 4 3 2 1 3 4 7 5 6 From the Library of Wow! eBook ptg 458 Chapter 19 An animation is a sequence of images, or frames, that vary slightly to create the illusion of movement over time. One of the most Internet- compatible animation formats is the animated GIF. The original designa- tion, GIF89a, gives you an idea of how long this format has been around. The GIF file format (Graphics Interchange Format) is used pri- marily for clip art, text, and line art, or for images that contain areas of solid color. Once the image is created, you can open and use it in any application that supports the GIF file format. Creating an Animated GIF Create an Animated GIF from Scratch Open Photoshop. Click the File menu, and then click New. Enter a name in the Name box. Click the Preset list arrow, and then select from the available presets, or enter in a customized Width, Height, and Resolution. Click the Color Mode list arrow, and then select a color mode for the image. Click the Bit Size list arrow, and then choose a bit depth for the image (8 bit recommended). Click the Background Contents list arrow, and then click White, Background Color, or Transparent (animated GIF files look best using transparency). Click OK. Create the first image for the animated GIF. 9 8 7 6 5 4 3 2 1 8 3 6 75 4 9 Copied layers for the animation First image From the Library of Wow! eBook ptg Chapter 19 Designing for the Web and Devices 459 Press Ctrl+J (Win) or A+J (Mac) to create a copy of your first animation in a separate layer. Modify the second image (animations are essentially the same image, modified slightly between each animation frame or, in this case each layer). Repeat steps 10 and 11 until you have enough layers for the animation. Click the Window menu, and then click Animation. Click the Animation Options button on the Animation panel, and then click Make Frames From Layers. Click the Play button to view your animation in the document window. Click the File button, and then click Save For Web & Devices. Fine-tune the image using the available options. Click Save to save the current image using the Save Optimized As dialog box. 18 17 16 15 14 13 12 11 10 14 12 17 15 See Also See Chapter 9, “Using the Paint, Shape Drawing, and Eraser Tools,” on page 215 for more information on using the various drawing tools. 18 From the Library of Wow! eBook ptg 460 Chapter 19 After you create an animation using the Animation panel, you can use controls at the bottom of the panel to work with the animation. You can use controls to select frames, play back the animation, and specify how many times you want to play it back. If you need to quickly copy or remove frames, you can use the Duplicate Selected Frames or Delete Selected Frames buttons. Animation is all about creating motion, which can be time intensive to do on a frame-by-frame basis. In Photoshop, it's not necessary to create every frame. You can use the Tweens Animation Frames button to help you create frames between one frame and another. Tweening allows you to quickly animate objects. The ani- mation appears by default in the Frames view; however, you can also display it in Timeline view (Extended). In Timeline view, you can see how each layer within the animation plays. In this view, you can also use Onion Skin mode, which allows you to view multiple frames simul- taneously. Working with Animation Work with an Animation Open a document with an animation. Click the Window menu, and then click Animation. Select any of the following options to play and select frames in the animation: ◆ First Frame. Selects the first frame. ◆ Previous Frame. Selects the previous frame. ◆ Play. Plays the animation. ◆ Next Frame. Selects the next frame. Click the Loop Count list arrow, and then select the option you want. ◆ Once/3 Times. Plays the animation one time or three times. ◆ Forever. Plays the animation over and over again in a continuous loop. ◆ Other. Opens the Loop Count dialog box where you can select a specific number of times to loop the animation. 4 3 2 1 4 3 5 Frames view Timeline view 7 8 6 From the Library of Wow! eBook ptg Chapter 19 Designing for the Web and Devices 461 Select any of the following options to work with frames: ◆ Tween Frames. Creates motion tween between frames. ◆ Duplicate Frames. Duplicates the selected frames. ◆ Delete Frames. Deletes the selected frames. To switch to Ti meline v iew (Extended), click the Convert to Timeline Animation button. ◆ This is a toggle button that switches back and forth between Timeline and Frames animation view. Select any of the following options to play and select frames in the animation: ◆ Zoom In and Zoom Out. Changes the Timeline view to see more or less of the animation window. ◆ Onion Skinning. Displays multiple frames simultaneously. To display other c ommand s an d options, click the Animation Options button. To switch to Fra mes v iew, c li ck the Convert to Frame Animation button. 9 8 7 6 5 Options menu for Frames view Options menu for Timeline view Onion skinning From the Library of Wow! eBook . Animation is all about creating motion, which can be time intensive to do on a frame -by- frame basis. In Photoshop, it's not necessary to create every frame. You can use the Tweens Animation. supports the GIF file format. Creating an Animated GIF Create an Animated GIF from Scratch Open Photoshop. Click the File menu, and then click New. Enter a name in the Name box. Click the Preset. one frame and another. Tweening allows you to quickly animate objects. The ani- mation appears by default in the Frames view; however, you can also display it in Timeline view (Extended). In