The First Digital Picture?
Uses elements of color to render a recognizable image.
Elements of a Digital Photo
In digital imaging, a pixel (or picture element) is a single point in a raster image.
Digital images are 100s to 1000s of pixels wide and high.
PPI vs DPI
300 PPI DIGITAL
300 DPI INKJET
Image Resolution
•
Assumes you know what print size you want.
900 pixels x 600 pixels
300 ppi = 3x2 inches
100 ppi = 9x6 inches
How to Get Your PPI
• Pixels Across / Intended Printed Width = PPI
• 2400 / 8 = 300
Deciding on a Print Size
Pixels Wide
•
•
Pixels Across / ppi = Print’s Width
Pixels Down / ppi = Print’s Height
High Resolution Print (300 ppi)
• 2400/300 ppi = 8 inches
• 3000/300 ppi = 10 inches
Lower Resolution Print (72 ppi)
• 2400/72 ppi = 33.3 inches
• 3000/72 ppi = 41.6 inches
Pixels High
Pixels Per Inch (PPI)
Sometimes incorrectly referred to as dots per inch (dpi)
•
PPI is a relative number and assumes
you know how what size your print will
be.
Aspect of an Image
• Landscape vs Portrait
Landscape Aspect
(wider than taller)
Portrait Aspect
(taller than wider)
Your Camera’s Aspect Ratio
Common 4:5 / 5:4 Ratios
• 4x5
• 8x10
• 16x20
Common 2:3 / 3:2 Ratios
• 4x6
• 8x12
• 12x18
• 16x24
Resizing Images
• May Require an Image Editor like Photoshop to fill in the gaps
Mega Pixels to Print Size
(Based on a print at 300 ppi)