1. Chapter 3 1 Introduction to Computer Graphics Photoshop: An Overview

2. Chapter 3 2 Introduction to Computer Graphics Bitmap-based application –Every image made up of a series of dots called pixels Wide range of tools to adjust and correct color, contrast and dynamic range Powerful type handling tools Capable of handling web-based graphics Photoshop: An Overview

3. Chapter 3 3 Introduction to Computer Graphics Film-based photography was the foundation for graphic reproduction starting in early 1900s Raster/paint software developed to work with scanned images Adobe Photoshop: Dominant image- editing program and electronic painting software program in world Raster/Paint Software

4. Chapter 3 4 Introduction to Computer Graphics Raster art or Bitmapped art –Series of dots arranged in a grid –Dots vary in value and color Resolution Color Models File formats Resolution and Color

5. Chapter 3 5 Introduction to Computer Graphics Resolution Number of dots that make up an image Raster images are resolution dependent Four ways to measure resolution –LPI: Lines per inch –SPI: Spots per inch –DPI: Dots per inch –PPI: Pixels per inch

6. Chapter 3 6 Introduction to Computer Graphics Color Models Three important color models RGB as a design tool –Red, green, blue –Additive primary colors CMYK for color correction –Cyan, Magenta, Yellow, Black –Subtractive color Grayscale

7. Chapter 3 7 Introduction to Computer Graphics Digital Image Capture Digital cameras

8. Chapter 3 8 Introduction to Computer Graphics Open and Save Files Working with Documents File>New –Size –Orientation: Portrait or Landscape –Color Mode: Another name for color model –Background contents File>Open File>Save File>Save As File>Save for web

9. Chapter 3 9 Introduction to Computer Graphics File Formats.PSD: Photoshop Document –Native Photoshop format, –Preserves layers –Access to all tools and commands

10. Chapter 3 10 Introduction to Computer Graphics File Formats.TIF: Tagged Image File Format –Any resolution, grayscale or color –Generally used for graphics files to be printed.EPS: Encapsulated Postscript –Specialized format for bitmap or vector graphics.JPG: Joint Photographic Experts Group –Compressed image format –Often used for complex photographic images.GIF: Graphics Interchange Format –Used specifically for the Web

11. Chapter 3 11 Introduction to Computer Graphics Everyday Tools and Commands Photoshop interface similar to Illustrator Rulers and Guides used to position elements on the page Toolbox basics

12. Chapter 3 12 Introduction to Computer Graphics Toolbox Divided into 4 main areas –Selection tools –Cropping tools –Modification tools; clone stamp, history brush, eraser, gradient, blur/sharpen tools –Vector/type tools –Miscellaneous tools; eyedropper, zoom tools

13. Chapter 3 13 Introduction to Computer Graphics Selection Tools Main selection tools: Marquee selection tools, Move tool, Lasso tools, Magic Wand tool, and Slice tool Crop tool is part of main selection tools, to reduce file size as well as a design decision tool

14. Chapter 3 14 Introduction to Computer Graphics Modification Tools Manipulate images in various ways Fix damaged photographs Paint or draw on images Copy parts of images Restore pixels deleted or erased Color gradients

15. Chapter 3 15 Introduction to Computer Graphics Vector/Type Tools Although primarily used to work with bitmapped images, Photoshop contains a comprehensive array of type and vector- based tools Vector/type tools similar to Illustrator Eventually the vector shapes are converted to dots when file is saved to a format other than native.psd

16. Chapter 3 16 Introduction to Computer Graphics Miscellaneous Tools Perform a variety of tasks such as magnification, color identification in a specific area of an image, and electronic sticky-type notes

17. Chapter 3 17 Introduction to Computer Graphics Modify only a portion of an image Create photomontage that use only pieces of images Selection tools include –Marquee selection tools –Lasso tools –Magic wand tool The Power of Selection!

18. Chapter 3 18 Introduction to Computer Graphics The Power of Selection!

19. Chapter 3 19 Introduction to Computer Graphics Rectangles or squares Ovals or circles Single row pixels horizontally and vertically Marquee Selection Tool

20. Chapter 3 20 Introduction to Computer Graphics Surround portion of image with a line Accuracy of selection depends on accuracy of mouse movements or pen and tablet Three variations –Lasso –Magnetic Lasso –Polygonal Lasso Lasso Tools

21. Chapter 3 21 Introduction to Computer Graphics Attempts to select a range of values, based on 256 color values Tolerance lets you set the range of values –Smaller tolerance number; the narrower the value range (color and shades) of the selection –Higher tolerance numbers; the wider the value range of a selection Tool works best is image has well defined areas of value Magic Wand Tool

22. Chapter 3 22 Introduction to Computer Graphics It All Works with Layers Using layers, Photoshop separates multiple images onto transparent layers Can manipulate each layer without affecting other images in project Layer Effects can add excitement and dynamics to design

23. Chapter 3 23 Introduction to Computer Graphics Working with Layers Layers palette is control center for layers in a file Background layer has special properties Can add, delete, duplicate layers Change layering order

24. Chapter 3 24 Introduction to Computer Graphics Layers Effects Special effects to add visual impact, such as blending, drop shadows, color overlays, bevel and emboss

25. Chapter 3 25 Introduction to Computer Graphics Transformation tools give power and control over images Healing Brush and Patch tools Clone Stamp tool Eraser tool Blur, Sharpen, and Smudge tools Dodge, Burn, and Sponge tools Transforming Images

26. Chapter 3 26 Introduction to Computer Graphics Use brush size to regulate selected and modified area Valuable for fixing old and/or damaged photos Areas repaired blend in with adjoining areas Healing Brush and Patch Tools

27. Chapter 3 27 Introduction to Computer Graphics Samples a particular section of an image and recreates it over and over again Also used to cover up areas of a photo with different imagery Clone Stamp Tool

28. Chapter 3 28 Introduction to Computer Graphics Alters specific parts of an image Works by clicking and dragging mouse Options allow fine-tuning of tool effect Blur, Sharpen, and Smudge Tools

29. Chapter 3 29 Introduction to Computer Graphics Related to traditional film- based photography Burn tool darkens an image; Dodge tool lightens it Sponge heightens or mutes color Dodge, Burn, and Sponge Tools

30. Chapter 3 30 Introduction to Computer Graphics Photoshop Has Too Much Fun with Type Dedicated Type Layer Similar to vector-draw programs Character palette lets you change –Type size –Leading –Alignment

31. Chapter 3 31 Introduction to Computer Graphics Photoshop Has Too Much Fun with Type Transformation tools work on type too! Layer effects applied to type Warp type: still remains editable after warp effect is applied

32. Chapter 3 32 Introduction to Computer Graphics Designers don’t normally output Photoshop directly from application More often imported into another application, then output from there Print preview dialog box allows for selection of printer, number of copies, scaled outputs and output modes How Photoshop Files Are Output

33. Chapter 3 33 Introduction to Computer Graphics Photoshop lets you color-manage the output to create more consistent color output between different devices Printing Tools in Photoshop

34. Introduction to Computer Graphics Design Professional Raster/Paint Software

35. Chapter 3 35 Introduction to Computer Graphics Scanners Flatbed scanners Drum scanners

36. Chapter 3 36 Introduction to Computer Graphics Film-based images Scanners Digital Image Capture How Are Photographic Images Created?

37. Chapter 3 37 Introduction to Computer Graphics Film-based Images Emulsions Prints Transparency film