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Photoshop: Designing Graphics for the Web
Christine Vucinich & Vicki Weidler
ITS Training Services224 B Computer BuildingUniversity Park, PA 16802seminars@psu.eduhttp://cac.psu.edu/training/
Overview
• Photoshop Basics– What is Photoshop?– Uses– Tour
• Web Graphics– Graphic Limitations– Display Considerations– Cross-Platform/Browser-Safe Palette– File Formats– Transparent Text– Saving for the Web
Overview Continued
• Scanning – Scanning Concepts
– Evaluating Originals
– Scanning Line Art vs. Photographic Images
– Scanning Strategies
– Photoshop Measurement/Correction Tools
– Additional Resources
What is Photoshop?
Photo retouching, image editing, and color painting program; graphic design tool
• Create high-quality digital images• Tools & special effects capabilities• Manipulate scanned images, slides, & original artwork• Isolate parts of an image for experimentation &
individual editing• And lots more…..
Uses of Photoshop
• Art (line drawings, charcoal, color original)• Photographic• Restoration• WWW (GIFS, JPEGS, etc.)• Montage• Halftones, Duotones, Tritones, Quadtones• Color Separations• Posterizations• Special Effects
Touring Photoshop
• Using Help
• Navigating: Windows, Palettes, Features & Tools
• Preferences
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
JPEG vs PNG
Comparison of JPEG and
PNG
68K PNG 31K JPG
GIF vs PNG
Comparison of JPEG and
PNG
10.8K PNG-8 with 64 colors
9.5K GIF with 64 colors
Transparent Text
Web Graphics
Saving for the Web
• 4-Up View
• File Sizes and Download Speeds
• Changing Options
• Halo Effect and Matte Options
Scanning Concepts
• Getting Images Into Photoshop• Bitmap vs. Vector Graphics• Pixel Dimensions• Image Resolution• Monitor Resolution• Printer Resolution• Screen Frequency• File Size
Evaluating Originals
• Color Range
• Contrast
• Size
• Good Original
• Shadow & Highlight Detail
• Tonal Corrections
Scanning Line Art
Scan Resolution = Output Device Resolution
X Sizing Factor
Scanning Photographic Images
Scan Resolution =
ScreenRuling X X
QualityFactor
SizingFactor
SizingFactor = Desired Size/Original Size
Basic Image Correction
• Examine the Original• Scan the Original• Identify the Image Colors & Tones• Measure & Adjust Highlights• Measure & Adjust Shadows• Measure & Adjust Midtones• Apply Unsharp Mask• Save File• Review Image for Rescanning or Additional
Corrections
Color & Tonal Adjustments
• Histograms
• Navigator Palette
• Gamma Settings
• Curve Controls
• Unsharp Mask Filter
Summary
• Photoshop Basics– What is Photoshop?– Uses– Tour
• Web Graphics– Graphic Limitations– Display Considerations– Cross-Platform/Browser-Safe Palette– File Formats– Transparent Text– Saving for the Web
Summary Continued
• Scanning – Scanning Concepts
– Evaluating Originals
– Scanning Line Art vs. Photographic Images
– Scanning Strategies
– Photoshop Measurement/Correction Tools
– Additional Resources
Conclusion
• Questions & Answers
• Additional Resources
• Thank You!!!
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