Image Resolution

Ya say you want a resolution? Well, all right!
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A Work in Progress!

Understanding Resolution
Understanding Digital Camera Resolution
Counting Megapixels — All Megapixels Are Not Created Equal —
Pixels
Image resolution examples
Image resolution examples
Printing for Less.com Photoshop Image Resolution Finding Happiness at 300 dots-per-inch
Resolution Inch by Inch - Deciphering SPI and PPI and DPI and LPI
Computer Graphics
Photoshop Tutorials Mike's Sketch Pad
Different levels of slide SCANNING resolutions and file FORMATS.
Image Workshop
Manuscript Digitization Demonstration Project
Fromex: Resolution Explained
1. to produce a “photo quality” print, we must print at 300 ppi (pixels per inch);
2. Commonly the size of a digital camera image is proportionate to a 4x5.3 not a 4x6.

With 10 megapixel CCDs (digital imaging elements) on the horizon, it is easy to predict the downfall of film. CCDs are more light sensitive than film, so a camera with 10 megapixel resolution would be more flexible than a film solution of similar quality (this would correspond to approximately 800 speed film). However it is important to note that most Pro photographers use film of speeds 25 or 50, and to equal the quality possible with such film, digital cameras may potentially need 50 megapixels, or more.

How many pixels are there in a frame of 35mm film?
20 million "quality" pixels in a top-quality 35mm shot.
Digital or 35MM?
Photos I would not have gotten with a digital camera

Digital Photography: The Myth of Resolution

Lesson 2: Understanding Resolution

An Introduction to Digital Photography

RESOLUTION:

Typical Computer screen: 800 x 600 is most common. Most others are at 1,024 x 768. For photography I find my huge 22" monitor at 1,600 x 1,200 is handy.
Digital Camera: 320 x 240 to 2,000 x 1,500 pixels
Studio TV : 720 x 480 pixels
HDTV 1920x 1080 (non-square pixels)
Feature film: 2,000 x 2,000 pixels
35mm still film: 3,000 x 2,000 pixels
Multiply the horizontal and vertical pixels for the total number of pixels.
2,000 x 3,000 is 6,000,000 pixels, or 6 megapixels.
Internet: fit in 400 x 700 pixel browser window.

Dan Heller's Tutorial Series: Digital Photography

FocalFix.com : Articles : Digital Photography Skills

The British Columbia Digital Library: Construction Tools: How-To Manuals Standards

TASI :: Technical Advisory Service for Images

Typical Resolution values for common output devices:

Monitor	72 - 96 LPI
Inkjet	75 - 125 LPI
Newsprint	80 - 100 LPI
Books	120 - 140 LPI
Magazines	150 - 175 LPI
Art Magazines & books	200 - 250 LPI
Digital Camera	240

**Resolutions of PhotoCD Images**
The Kodak Photo CD
Photo CD Application Background
Resolution Image size in pixels	Pixels	Name
192 by 128	24,576	Base/16
384 by 256	98,304	Base/4
768 by 512	393,216	Base
1536 by 1024	1,572,864	4Base
3072 by 2048	6,291,456	16Base
6144 by 4096	25,165,824	64Base

Printing Kodak Photo CD images
A few scanning tips

Image size in pixels	Kodak's name for the size	Image size in bytes
6144x4096	Base*64 (Optional Master)	75 megabytes
2048 x 3072	Base*16	18,874,368
1024 x 1536	Base*4 (same resolution as HDTV)	4,718,592
512 x 768	Base (same resolution as TV)	1,179,648
256 x 384	Base/4 (Thumbnail)	294,912
128 x 192	Base/16 (Small Thumbnail)	73,728

Kodak Photo CD Basics

Master Photo CD Five-Resolution Image Pac format:

Base/16     129 x 192      73.7Kb     Low res monitor preview


Base/4      256 x 384      249.9Kb    Index print thumbnails


Base        512 x 768      1.1Mb      Television or monitor display


Basex4      1024 x 1536    4.7Mb      Prepress scan for 3"x5" max @ 150 lpi

Basex16     2048 x 3072    18Mb       Film output; prepress for up to 8"x10"

Pro Photo CD 6-Resolution Image Pac format:

FROM 35MM:

Base/16     129 x 192      73.7Kb     Low res monitor preview

Base/4      256 x 384      249.9Kb    Index print thumbnails

Base        512 x 768      1.1Mb      Television or monitor display

Basex4      1024 x 1536    4.7Mb      Prepress scan for 3"x5" max @ 150lpi 

Basex16     2048 x 3072    18Mb       Film output; prepress for up to 8"x10" 

Basex64     4096 x 6144    72Mb       Prepress for over 8"x10"

FROM OTHER SIZES:

FILM SIZE                               6-RES IMAGE PAC FILE SIZE                               5-RES IMAGE PAC FILE SIZE

 35mm full frame         4096 x 6144 pixels-72MB               2048 x 3072 pixels-18MB

 4.5cm x 6cm             4096 x 3072 pixels-36MB               2048 x 1536 pixels- 9MB

 6cm x 6cm               4096 x 4096 pixels-45MB               2048 x 2048 pixels-11MB

 6cm x 7cm               4096 x 4780 pixels-55MB               2048 x 3490 pixels-14MB

 6cm x 9cm               4096 x 6144 pixels-72MB               2048 x 3072 pixels-18MB

 4" x 5"                 4096 x 5200 pixels-59MB               2048 x 2600 pixels-15MB

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David J. Hark
HARK/INTERNET-HELP, inc.
P. O. Box 201 Shepherdstown, WV 25443-0201
304-876-2607
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http://www.dhark.com
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Last updated: 9 January 2006