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Digital Imaging

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Digital Imaging. Utah State University Extension. Eric Hawley 'Agenda' ... Understanding and working with different image file formats ... – PowerPoint PPT presentation

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Title: Digital Imaging


1
Digital Imaging
  • Utah State University Extension
  • Eric Hawley

2
Agenda
  • Digital Camera features, terms, and technologies
  • Transferring images from camera to computer
  • Developing digital images        
  • Understanding resolution and image size (How do
    you get a 5x7 image?)
  • Editing, transforming, and processing images
  • Understanding and working with different image
    file formats
  • How to adjust an image for different applications
    (such as web, e-mail, archival and print)
  • Editing blemishes
  • Adjusting color balance, contrast, brightness,
    etc.
  • Batch tools making similar changes to a large
    group of photos (Using Photoshop and Photoshop
    Elements)

3
Things that Dont Go Away
  • There are always two people in every picture 
    the photographer and the viewer.  Ansel Adams
  • No photographer is as good as the simplest
    camera.  Edward Steichen
  • I hate cameras.  They are so much more sure than
    I am about everything.  John Steinbeck
  • Buying a Nikon doesn't make you a photographer. 
    It makes you a Nikon owner.  Author Unknown

4
Post Photographic Skills
  • Getting files off of the camera or scanner
  • Archiving
  • Choosing and adjusting image file type
  • Editing
  • Scaling size/resolution for web/e-mail
  • Scaling size/resolution for print

5
Terms and Concepts
  • Pixels
  • Image Resolution
  • Output or Physical Image Size
  • Color Depth
  • File Formats

6
To the drawing board
7
Back from the drawing board
  • File Formats

8
Web Friendly File Formats
  • JPEG images (.jpg, .jpeg, .jpe, .jfif) -
    many compression levels (lossy)
  • CompuServe images (.gif)- compression format
    LZW (lossless)
  • - special interlaced, non-interlaced
  • Portable network graphic images (.png)-
    compression format LZ77

9
JPEG/JPG Photographical
  • JPEG is designed for compressing either
    full-color or grey-scale digital images of
    "natural", real-world scenes. It does not work so
    well on non-realistic images, such as cartoons or
    line drawings.
  • Remember, the 'P' in JPEG stands for
    'Photographic'. It was designed to be used to
    compress photographic image data.
  • (Joint Photographic Experts Group)

10
GIF Solid colors and lines
  • GIF images can contain a maximum of 256 colors (8
    bits) or less (Graphics Interchange Format)
  • if you create a GIF image of a red arrow, you
    can customize the file to have only two colors,
    red and white.

11
PNG
  • PNG Essentially Extended GIF Images.
  • Allows for up to 24-bit color including
    control of opacity. Saving, restoring and
    re-saving a PNG image will not degrade its
    quality. PNG does not support animation like GIF
    does. Patent-Free

12
Edit Friendly
  • Uncompressed or lossless compression
  • Saved, edited, saved, edited without penalty
  • Good for archives (Why?)

13
Edit Friendly (web poor) file formats(Either
uncompressed or lossless compression)
  • TIFF images (.tif, .tiff)
  • - uncompressed (Compressed packed bits, LZW,
    CCITT T.4, Deflate, new style JPEG)
  • Standard Windows bitmap images (.bmp)-
    uncompressed
  • Photoshop images (.psd, .pdd)- uncompressed
  • RAW images (.raw)
  • - shockingly uncompressed

14
Four Steps to Preparing Digital Photos
15
Step A.
  • Archive important photos in their BIRTHDAY
    SUITS. (native, un-edited, un-resaved, happy,
    naked state)
  • (Meaning, make a copy and DONT work on the
    copy)

16
Step B
  • If you will be doing lots of
  • saving, editing, saving, editing
  • FIRST, convert to a
  • lossless or un-compressed form.

17
Step C
  • Edit and Adjust
  • For appropriate pixel size
  • Cropping, color, orientation
  • Any other editing

18
Step D.
  • Save in the desired production format
  • Done!

19
On to software
  • Picasa2
  • Windows XP
  • Filing System, Picture Details, Viewing
  • Irfanview
  • Photoshop Elements or CS
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