Photoshop: Creating and Preparing Images for the Web

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Presentation transcript:

Photoshop: Creating and Preparing Images for the Web Instructor: Adam Cavotta

Overview Explore the limitations of images on the Web Become familiar with different Web file formats Explore cross-platform/browser-safe colors Create transparent text, image maps, animation and rollover effects Slice and save images for the Web Learn how to optimize images for the Web Become familiar with the ImageReady interface

Graphic Limitations Connection Speeds User Configurations

Display Considerations Screen Sizes Colors

Cross Platform/Browser-Safe Colors 256 vs. 216 Colors Dithering Using the Color Picker

File Formats JPEG – Joint Photographic Experts Group GIF – Graphics Interchange Format PNG – Portable Network Graphics

JPEG Best for photos or continuous tone, full-color images Uses 16 million colors Browsers use reasonable approximations Work in RGB mode Uses lossy compression Saving (Standard, Optimized, Progressive)

GIF Best for solid color images (buttons, logos) Uses 256 colors Browsers uses 216 colors Work in Indexed mode Good compression Interlaced

PNG (8-bit) Best for line art (logos) Compresses solid areas of color well and maintains sharp detail Generally, has better compression than GIF (10-30% smaller) If considering saving as GIF, also consider saving as PNG (8-bit) Not supported by older browsers

PNG (24-bit) Best for continuous-tone images Compresses well, but can be larger than JPEGs If considering saving as JPEG, could also consider PNG (24-bit) Not supported by older browsers

Comparison of JPEG and PNG JPEG vs PNG Comparison of JPEG and PNG 68K PNG 31K JPG

Comparison of JPEG and PNG GIF vs PNG Comparison of JPEG and PNG 10.8K PNG-8 with 64 colors 9.5K GIF with 64 colors

Transparent Text Photoshop

Saving for the Web 4-Up View File Sizes and Download Speeds Changing Options Halo Effect and Matte Options

Toggling Between Photoshop & ImageReady Toggling Button

Slicing

Image Maps

Rollover Effects

Animations

Summary Explore the limitations of images on the Web Become familiar with different Web file formats Explore cross-platform/browser-safe colors Create transparent text, image maps, animation and rollover effects Slice and save images for the Web Learn how to optimize images for the Web Become familiar with the ImageReady interface

Conclusion Resources Questions & Answers Evaluations Thank You!!!