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TABLE 3: Printing Images / Photography (A Guide To Required File Sizes For Sharp Photos
When Printing: Image Size In Pixels)
NATUS AT ERROR THE ETYSIT
Photo Resolution: The degree of resolution can greatly
enhance the quality and efficiency of digital image use,
as much as it can threaten the image quality and limit the
ability to use the image. Digital image resolution varies,
and both high and low resolutions have their purposes
and advantages. For instance, high resolution is important
for print publications, whilst lower resolutions are more
useful for web based applications. Once a photo is
taken, it is possible to compress images in order to lower
their resolution, but not possible to increase resolution.
Therefore, photos should have as high a resolution
as possible, to allow for the greatest flexibility in their
eventual use.
(Virtual Size Of Images)
Megapixel Rating
Print Size (Inches) At 200Ppi
Print Size (In.) At 300Ppi
640 X 480
0.3
3.2 X 2.4
2.1 X 1.6
1,024 X 768
0.8
5.1 X 3.8
3.4 X 2.5
1,280 X 960
1.2
6.4 X 4.8
4.2 X 3.2
1,504 X 1,000
1.5
7.5 X 5.0
5.0 X 3.3
1,632 X 1,224
2.0
3.3 X 6.1
5.4 X 4.1
2,000 X 1,312
2.6
10.0 X 6.6
6.7 X 4.4
2,240 X 1,488
3.3
11.2 X 7.4
7.5 X 5.0
2,275 X 1,520
3.5
11.4 X 7.6
7.6 X 5.1
2,272 X 1,704
3.9
11.4 X 8.5
7.6 X 5.7
Different ways to measure resolution: Digital Images
are composed of pixels, square units of measurement
composed of smaller units called bits. More bits per pixel
increases the pixel’s ability to render colors. More pixels in
an image increases its clarity and definition.
2,590 X 1,920
5.0
13.0 X 9.6
8.6 X 6.4
Resolution is expressed in two ways:
3,008 X 2,000
6.0
15.0 X 10.0
10.0 X 6.7
•• Dimension: The number of pixels in an image by
4,256 X 2,848
12.1
21.3 X 14.2
14.2 X 9.5
width and height like for example 3000 x 2000
pixels
4,536 X 3,024
13.7
22.7 X 15.1
15.1 X 10.1
5,782 X 3,946
22.8
28.9 X 19.7
19.3 X 13.2
TABLE 4: A Guide To Required File Sizes For Sharp Images On Websites
Image Size In Pixels
(Virtual Size Of Images)
Megapixel Rating
Size (Inches) At 72Ppi
(On The Website)
200 X 150
0.1
2.8 X 2.1
300 X 225
0.2
4.2 X 3.1
400 X 300
0.2
5.6 X 4.2
640 X 480
0.3
8.9 X 6.7
800 X 600
0.5
11.2 X 8.4
1,024 X 768
0.8
14.2 X 10.7
1,280 X 960
1.2
17.8 X 13.3
1,504 X 1,000
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Pixels per inch (PPI) is a measurement of the pixel
density (resolution) of devices in various contexts:
typically computer displays, image scanners, and digital
camera image sensors. It is defined as the horizontal or
vertical density (for square pixels) as those are the same
but the density on along the diagonal is lower. Square
pixels are the norm (otherwise those densities would
be different). Most computers use displays that have 72
pixels per inch.
1.5
20.9 X 13.9
GENERATING CONTENT ON CCAF NATIONAL PROJECTS: GUIDANCE FOR CAPTURING AND CREATING STORIES, PHOTOS, AND FILMS
A 2 inches thumbnail image at
640 x 480 pixels.
•• Megapixels: the number of pixels by width and
height times a million: 3000x2000=6 megapixels.
Usually, megapixels are used to indicate the
maximum image size of a digital camera.
Image size: Image size is also important to consider when
collecting photos. Images are often measured in kilobytes
(KB), megabytes (MB) or gigabytes (GB), which represents
the amount of space the image occupies. A guide to
required file sizes for sharp photos when printing is given
in Table 3. A guide to required file sizes for sharp images
on websites is given in Table 4.
So if you need photo for a brochure that will be five
inches in width when printing, you should plan to use a
photo with at least 1,500 x 1,000 pixels. If you need a big
poster with razor-sharp images that each are 10 inches,
you should plan to use photos that are a minimum of
3,000 x 2,000 pixels. On the other hand if you need a little
thumbnail photo that with be printed at two inches in
width, you can use a 640 x 480 pixel.
An example of high resolution.
An example of low resolution.
GENERATING CONTENT ON CCAF NATIONAL PROJECTS: GUIDANCE FOR CAPTURING AND CREATING STORIES, PHOTOS, AND FILMS
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