Photoshop Elements 3 Solutions: The Art of Digital Photography- P10

Photoshop Elements 3 Solutions: The Art of Digital Photography- P10: This book rocks! It is not just a revised version; this is a brand new edition.So much has changed in Adobe Photoshop Elements 3 that it is practically a whole new program,and Mikkel Aaland has completed quite an amazing undertaking with PhotoshopElements 3 Solutions.
Nội dung trích xuất từ tài liệu:
Photoshop Elements 3 Solutions: The Art of Digital Photography- P10 Before I get into how to fix this problem, it’s helpful to explain a basic fact about the GIF transparency. Variable opacity is not an option in the GIF format. It supports only one transparent color, which effectively means a 1-bit mask. Areas are either transparent or not. To get around the 1-bit mask limitation, you can have Photoshop Elements cre- ate a pseudo multi-bit mask. If you know the color of your web page background, all you need to do is choose that color from the Matte pop-up menu in the Save for Web dialog box. Photoshop Elements then adds variations of this color to edges of your graphic. If your web background consists of multiple colors, pick a representative color from your background and use that. Creating this pseudo multi-bit mask adds some file size to your GIF, but not much. Because I knew my graphic would be placed on a page with a gold background, I chose Other from the Matte pop-up menu, and then in the Color Picker I chose FFCC33, the hexadecimal value for my color. The selected color was displayed in the Matte box. (If you set the Matte to None, no pseudo multi-bit mask is created. Use None if an aliased look is what you want.) A zoomed-in shot of the edges shown in Figure 10.20 illustrates how Photoshop254 Elements adds variations of the Matte color to the edges of the graphic. Now when the P R E PA R I N G I M A G E S A N D G R A P H I C S F O R T H E S C R E E N ■ graphic is placed against the browser background, a nice anti-aliasing effect makes the graphic look much better. 10: CHAPTER Figure 10.20: When you choose a Matte color, a pseudo multi-bit mask is created (left), which diminishes the jagged look. Now the graphic floats nicely on the page (right). You can also use the Save As or Image Mode Indexed Colors method to designate transparent areas. While in the RGB mode: 1. Use one of the Eraser or Selection tools to delete your background or other areas to transparency. Transparency is signified by a gray and white checker- board pattern. 2. Choose File Save As or Image Mode Indexed Colors. (If your file con- tains layers, dialog box will appear asking, “Flatten layers?” To proceed, answer affirmative. If you want to keep your layers intact, work on a copy: File Duplicate.)3. Click the Transparency check box in the dialog box. If you know the back- ground color of your web page, and you want to avoid a jagged or halo effect, have Photoshop Elements create a pseudo multi-bit mask. In the Matte pop-up menu, choose from the preset options or enter a col ...