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Scanning and Graphics Workshop I

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Graphics for the Web, Scanning and Introduction to Photoshop Graphics Workshops I: flatbed scanner and Photoshop basics II: scanner and digital camera III ... – PowerPoint PPT presentation

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Title: Scanning and Graphics Workshop I


1
Scanning and Graphics Workshop I
  • Graphics for the Web, Scanning and Introduction
    to Photoshop

2
Graphics Workshops
  • I flatbed scanner and Photoshop basics
  • II slide scanner and digital camera
  • III Photoshop tricks - neat things to do with
    text, graphics, and file compression
  • IV Clickable images
  • animated gifs and graphics helpers

3
  • Basic considerations of graphic-design for the
    Web
  • Intro to Web graphic file formats
  • Scanning paper documents
  • Intro to graphic-editing with Photoshop
  • File conversions

4
Web-Graphics Basics
  • Basic Considerations
  • Most common file formats are .gif and .jpeg
  • 8-bit color
  • 254 colors of Netscape

http//www.killersites.com/1-design/index.html
5
GIFs and JPEGS
  • GIFs use an LZW compression algorithm and have
    lossless compressions (decompressed image looks
    just like the compressed image)
  • uses linear pattern recognition for run-length
    encoding, so horizontal regularity is greatly
    compressable

6
GIF compression
941 bytes
1000
1001
1033
1102
1147
1186
1803
6685
7
GIFs and JPEGs, cont.
GIF 89a
  • allows transparency, animation, interlacing, etc.

8
GIFs and JPEGs, cont.
JPEG
  • best way to compress photographic images
    (continuous tone images)

9
Flatbed scanners
  • mac and Windows 95 machines
  • use scanner software for image acquisition
  • use Photoshop for image manipulation and file
    conversion

10
Scanning
  • scan as millions of colors, even if the
    original image is black and white
  • save file as .bmp or.tiff

11
Photoshop
  • Open file
  • work with layers
  • use image adjustment routines to compensate for
    bad scanning
  • resize images for use on Web
  • save images in a web formats

12
Saving in .GIF format
  • select mode from the menu bar
  • select indexed color
  • say OK to flatten layers?
  • select either 8-bits/pixel or Other for
    resolution - its up to you. However, because
    gifs are an indexed file format, the fewer colors
    you use, the smaller your file will be!

13
  • select exact or adaptive for the palette
  • click OK
  • select file, save as, and be sure to select
    CompuServe GIF in the Save File as Format
    Type box.

14
Saving in JPEG format
  • if you have more than one layer you must
    flatten the image
  • save as JPEG (choose jpeg in Save File as Format
    Type box)
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