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Photoshop: An Overview

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Photoshop: An Overview * Introduction to Computer Graphics – PowerPoint PPT presentation

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Title: Photoshop: An Overview


1
Photoshop An Overview
CONCEPT 1
2
Photoshop An Overview
CONCEPT 1
  • 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

3
Raster/Paint Software
INTRODUCTION
  • 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

4
Resolution and Color
CONCEPT 3
  • Raster art or Bitmapped art
  • Series of dots arranged in a grid
  • Dots vary in value and color
  • Resolution
  • Color Models
  • File formats

5
Resolution
CONCEPT 3
  • 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
Color Models
CONCEPT 3
  • 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
Digital Image Capture
CONCEPT 2
  • Digital cameras

8
Open and Save Files
CONCEPT 4
  • Working with Documents
  • FilegtNew
  • Size
  • Orientation Portrait or Landscape
  • Color Mode Another name for color model
  • Background contents
  • FilegtOpen
  • FilegtSave
  • FilegtSave As
  • FilegtSave for web

9
File Formats
CONCEPT 4
  • .PSD Photoshop Document
  • Native Photoshop format,
  • Preserves layers
  • Access to all tools and commands

10
File Formats
CONCEPT 4
  • .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
Everyday Toolsand Commands
CONCEPT 5
  • Photoshop interface similar to Illustrator
  • Rulers and Guides used to position elements on
    the page
  • Toolbox basics

12
Toolbox
CONCEPT 5
  • 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
Selection Tools
CONCEPT 5
  • 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
    reducefile size aswell as a design
    decisiontool

14
Modification Tools
CONCEPT 5
  • 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
Vector/Type Tools
CONCEPT 5
  • 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
Miscellaneous Tools
CONCEPT 5
  • Perform a variety of tasks such as magnification,
    color identification in a specific area of an
    image, and electronic sticky-type notes

17
The Power of Selection!
CONCEPT 6
  • 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

18
The Power of Selection!
CONCEPT 6
19
Marquee Selection Tool
CONCEPT 6
  • Rectangles or squares
  • Ovals or circles
  • Single row pixels horizontally and vertically

20
Lasso Tools
CONCEPT 6
  • 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

21
Magic Wand Tool
CONCEPT 6
  • 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

22
It All Works with Layers
CONCEPT 7
  • 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
Working with Layers
CONCEPT 7
  • Layers palette is control center for layers in a
    file
  • Background layer has special properties
  • Can add, delete, duplicate layers
  • Change layering order

24
Layers Effects
CONCEPT 7
  • Special effects to add visual impact, such as
    blending, drop shadows, color overlays, bevel and
    emboss

25
Transforming Images
CONCEPT 8
  • 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

26
Healing Brush and Patch Tools
CONCEPT 8
  • Use brush size to regulate selected and modified
    area
  • Valuable for fixing old and/or damaged photos
  • Areas repaired blendin with adjoining areas

27
Clone Stamp Tool
CONCEPT 8
  • Samples a particularsection of an image and
    recreates it over and over again
  • Also used to cover up areas of a photo with
    different imagery

28
Blur, Sharpen, and Smudge Tools
CONCEPT 8
  • Alters specific parts of an image
  • Works by clicking anddragging mouse
  • Options allow fine-tuning of tool effect

29
Dodge, Burn, and Sponge Tools
CONCEPT 8
  • Related to traditional film-based photography
  • Burn tooldarkens an image Dodge toollightens
    it
  • Sponge heightensor mutes color

30
Photoshop Has Too Much Fun with Type
CONCEPT 9
  • Dedicated Type Layer
  • Similar to vector-draw programs
  • Character palette lets you change
  • Type size
  • Leading
  • Alignment

31
Photoshop Has Too Much Fun with Type
CONCEPT 9
  • Transformation tools work on type too!
  • Layer effects applied to type
  • Warp type still remains editable after warp
    effect is applied

32
How Photoshop Files Are Output
CONCEPT 10
  • Designers dont 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

33
Printing Tools in Photoshop
CONCEPT 10
  • Photoshop lets you color-manage the output to
    create more consistent color output between
    different devices

34
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35
Scanners
CONCEPT 2
  • Flatbed scanners
  • Drum scanners

36
How Are Photographic Images Created?
CONCEPT 2
  • Film-based images
  • Scanners
  • Digital Image Capture

37
Film-based Images
CONCEPT 2
  • Emulsions
  • Prints
  • Transparency film
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