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Introduction to
Computer Graphics
Design Professional
Raster/Paint Software
Chapter 3 2
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
Chapter 3 3
Introduction to Computer Graphics
Photoshop: An Overview
Chapter 3 4
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
Chapter 3 5
Introduction to Computer Graphics
Film-based images
Scanners
Digital Image Capture
How Are Photographic
Images Created?
Chapter 3 6
Introduction to Computer Graphics
Film-based Images
Emulsions
Prints
Transparency film
Chapter 3 7
Introduction to Computer Graphics
Scanners
Flatbed scanners
Drum scanners
Chapter 3 8
Introduction to Computer Graphics
Digital Image Capture
Digital cameras
Chapter 3 9
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
Chapter 3 10
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
Chapter 3 11
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
Chapter 3 12
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
Chapter 3 13
Introduction to Computer Graphics
File Formats
.PSD: Photoshop Document
– Native Photoshop format,
– Preserves layers
– Access to all tools
and commands
Chapter 3 14
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
Chapter 3 15
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
Chapter 3 16
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
Chapter 3 17
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
Chapter 3 18
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
Chapter 3 19
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
Chapter 3 20
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
Chapter 3 21
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!
Chapter 3 22
Introduction to Computer Graphics
The Power of Selection!
Chapter 3 23
Introduction to Computer Graphics
Rectangles or squares
Ovals or circles
Single row pixels horizontally and vertically
Marquee Selection Tool
Chapter 3 24
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
Chapter 3 25
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
Chapter 3 26
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
Chapter 3 27
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
Chapter 3 28
Introduction to Computer Graphics
Layers Effects
Special effects to add visual impact, such
as blending, drop shadows, color
overlays, bevel and emboss
Chapter 3 29
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
Chapter 3 30
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
Chapter 3 31
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
Chapter 3 32
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
Chapter 3 33
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
Chapter 3 34
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
Chapter 3 35
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
Chapter 3 36
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
Chapter 3 37
Introduction to Computer Graphics
Photoshop lets you color-manage the
output to create more consistent color
output between different devices
Printing Tools in Photoshop

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photoshop intro.ppt

  • 1. Introduction to Computer Graphics Design Professional Raster/Paint Software
  • 2. Chapter 3 2 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
  • 3. Chapter 3 3 Introduction to Computer Graphics Photoshop: An Overview
  • 4. Chapter 3 4 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
  • 5. Chapter 3 5 Introduction to Computer Graphics Film-based images Scanners Digital Image Capture How Are Photographic Images Created?
  • 6. Chapter 3 6 Introduction to Computer Graphics Film-based Images Emulsions Prints Transparency film
  • 7. Chapter 3 7 Introduction to Computer Graphics Scanners Flatbed scanners Drum scanners
  • 8. Chapter 3 8 Introduction to Computer Graphics Digital Image Capture Digital cameras
  • 9. Chapter 3 9 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
  • 10. Chapter 3 10 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
  • 11. Chapter 3 11 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
  • 12. Chapter 3 12 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
  • 13. Chapter 3 13 Introduction to Computer Graphics File Formats .PSD: Photoshop Document – Native Photoshop format, – Preserves layers – Access to all tools and commands
  • 14. Chapter 3 14 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
  • 15. Chapter 3 15 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
  • 16. Chapter 3 16 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
  • 17. Chapter 3 17 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
  • 18. Chapter 3 18 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
  • 19. Chapter 3 19 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
  • 20. Chapter 3 20 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
  • 21. Chapter 3 21 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!
  • 22. Chapter 3 22 Introduction to Computer Graphics The Power of Selection!
  • 23. Chapter 3 23 Introduction to Computer Graphics Rectangles or squares Ovals or circles Single row pixels horizontally and vertically Marquee Selection Tool
  • 24. Chapter 3 24 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
  • 25. Chapter 3 25 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
  • 26. Chapter 3 26 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
  • 27. Chapter 3 27 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
  • 28. Chapter 3 28 Introduction to Computer Graphics Layers Effects Special effects to add visual impact, such as blending, drop shadows, color overlays, bevel and emboss
  • 29. Chapter 3 29 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
  • 30. Chapter 3 30 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
  • 31. Chapter 3 31 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
  • 32. Chapter 3 32 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
  • 33. Chapter 3 33 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
  • 34. Chapter 3 34 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
  • 35. Chapter 3 35 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
  • 36. Chapter 3 36 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
  • 37. Chapter 3 37 Introduction to Computer Graphics Photoshop lets you color-manage the output to create more consistent color output between different devices Printing Tools in Photoshop