This document discusses digital images and factors to consider when selecting and using images. It covers the different sources to access images, such as the web, camera, or scanner. For selection, the four main factors discussed are content, resolution, quality, and file format. The document provides examples of different types of images like photos versus illustrations. It also discusses common file formats, image resolution versus quality, and factors to consider when selecting images for screen versus print use.

1. Digital Images
Kiran Budhrani
kiran.enderun@gmail.com

2. Explore a beautiful media element

3. Text Images Audio Video
Access
Select Use
(capture)

4. 1. WEB
Access Images 2. CAMERA
3. SCANNER

5. Use
For Screen For Print

6. Selection
4 Factors :
CONTENT  What is it ?
RESOLUTION  How big ?
 How clear ?
QUALITY
How bright / dark ?
FILE FORMAT  What type of file ?

7. PIXELS WIDE
PIXELS
TALL

13. Photos vs. Illustrations
 Photos
 Real, Evidence
 Illustrations / Graphics
 Representation, Not real
 Illus – typically hand-drawn
 Graphics – typically created with the
computer

14. Graphic

15. Illustration

16. 2D Graphic 3D Graphic

17. 3D Graphic

19. Logos

20. File Formats
 .JPEG (joint photographic experts group)
 Photos
 .PNG (portable network graphic)
 High quality web graphics or photos
 Supports transparency
 .GIF (graphics interchange format)
 Low quality web graphics
 Supports transparency
 Logos

21. Common Trends
Image Resolution Image Quality File Size

22. Selection
4 Factors :
CONTENT  Photo / Illustration
RESOLUTION  Image Size
QUALITY  Clarity, Brightness
FILE FORMAT  File Extension

23. Selection and Use
FOR SCREEN FOR PRINT
Content Appropriate Appropriate
Resolution Low-High Must be High
(file size) (file size)
Quality Must be Good Must be Good
Format JPG, PNG, GIF JPG, PNG

24. The more megapixels a camera
has, the better the pictures.
12.1 MEGA PIXELS 5 MEGA PIXELS

25. The more megapixels a camera
has, the better the pictures.
big fat lie
12.1 MEGA PIXELS 5 MEGA PIXELS

26. Understanding Megapixels
3
Megapixel
Camera
has
3
Million
%ny
colored
dots
in
a
photo
2,048 (horizontal) x 1,536 (vertical) pixels
3,145,728 pixels

27.  High MP is only useful if you will usually:
1. Crop photos
2. Print photos that are blown-up
 4MP camera
– good enough for screen view

28.  If
there are more pixels in an inch..
– higher quality, higher resolution

29. Compare Cropping Details
10 MP camera 5 MP camera

30. 10 MP 7”
5”

31. 10 MP 7”
5”

32. 10 MP 7”
5”

33. 10 MP 7”
5”

34. 5 MP 7”
5”

35. 5 MP 7”
5”

36. 5 MP 7”
5”