PHOTOSHOP - Image Resolution


Before PROCESSING a photo in photoshop - you've got to collect pictures that have sufficient RESOLUTION for your needs.

What exactly is “RESOLUTION”?

“Image Resolution” has come to refer to TWO things:
  • The NUMBER OF PIXELS captured in a digital image (ie. 1162 x 864)
    • This is determined by the digital camera you’ve used.
  • The DPI (Dots Per Inch) set in an image for printout
    • This is established by PROCESSING the image in PHOTOSHOP. DPI describes how crammed together the pixels will appear when the image is placed and printed in INDESIGN


The chart below lists the MAXIMUM allowable publishing sizes for each of our cameras:
DIGITAL CAMERA COMPARISONS - RESOLUTIONS, and MAXIMUM PRINT SIZES
Mega Pixels
Camera
Zoom
Pixel Width
Pixel Height
Max Colour Res
Max B&W Res
Pic
Comments
0.3
Sony Mavika
10x
640
480


Camera00.jpg
Not really used for yearbook purposes. This camera IS useful for webpage photography and features storage on floppy disk for easy downloading. It also has a considerable zoom!
0.99
Kodak DC210
2x
1152
864
23x17 pica
25x19
pica
Camera01.jpg
Purchased in 1997 - this camera is a VERY simple point and shoot, and was used to take all the pictures in this chart.
2.6
Canon Pro90is
10x
1856
1392
37x27 pica
41x31 pica
Camera02.jpg
Low Res, but it packs an exceptionally good lens and image stabilization system. Great 10x zoom for sports photography. Battery is currently in need of replacement
3.9
Minolta S414
3x
2272
1704
45x34 pica
51x38 pica
Camera03.jpg
A good all-purpose point and shoot. Not much zoom, but good for general use and candids.
4.9
Minolta 7i
7x
2560
1920
51x38 pica
57x43 pica
Camera04.jpg
A complicated camera, the 7i uses batteries very quickly, and as a result is a less reliable camera. The battery compartment is also slightly damaged from misuse, and must be handled with care.
5.0
Canon S2
12x
2592
1944
51x38 pica
58x43 pica
Camera05.jpg
An EXCELLENT all around camera with massive zoom, resolution and image quality. The camera failed once in fall 2006, and was repaired under warranty.

Occassionally, the "change batteries" warning lights up prematurely. Turn the camera off, and on again to see if that clears it.
5.9
Canon S3
12x
2816
2112
56x42 pica
63x47 pica
Camera06.jpg
An even BETTER version of the Canon S Series.

Occasionally, the "change batteries" warning lights up prematurely. Turn the camera off, and on again to see if that clears it.
10.2
Nikon D40x

3872
2592
77x51.8
87x58
nikond40x2.jpg
A DSLR camera (Digital Single Lens Reflex)
  • Very fast shutter speed with no lag
  • "In-lens" viewfinder
  • Interchangeable lenses

  • At 10mp, an image from this camera will effectively fill a full yearbook page, so long as there is no cropping to be done.

LENSES:
  • AF-S 18-55mm G VR
  • AF-S 18-55mm GII ED
  • AF-S 55-200mm 1.4-5.6 G ED (Zoom)
10.2
Nikon D80

3872
2592
77x51.8
87x58
NikonD80.jpg
May yield a higher ISO and faster burst than the D40x, but most users won't see the difference.

The DSLRs have interchangeable lenses. The choice of lens has a dramatic effect:

Least Zoom
Max Zoom
AF-S 18-55mm (Wide Angle)
Better for
  • Team Shots
  • Panoramas
  • General Purpose

You can get closer to your subjects without losing them off the sides of your image

Creates a slight "Fisheye" effect
Photography_DXLens01a.jpg
18mm

Photography_DXLens01b.jpg
55mm

AF-S 55-200mm (Zoom Lens)
Better for:
  • Sports (distance)
Photography_DXLens02a.jpg
55mm

Photography_DXLens02b.jpg
200mm




- A HIGHER DPI (ie. 300DPI) is needed to make the image look “clean” and detailed.
- A LOWER DPI (ie. 72 DPI) allows the image to appear larger, but it can look “Jaggy” or blurry

Extensive information on current digital cameras can be found on dpreview.com

DPS-Sizes.jpgDPS dimensions:
The size of our yearboook DPS is 102 pica x 66 pica

BLEEDS
A "Bleed" is an element that touches the edge or trimline" of a page. That object must be made a full pica larger at every edge to ensure that it fully crosses the trimline, with no chance of it leaving a "hairline" behind.

If you wanted to "bleed" an image off the edge of a page, you would have to add an extra pica to each edge that contacts a cutline.

So an image that would bleed off the three sides of a full page must be 68 pica x 52 pica

An image that covers a complete DPS (ie, our big school photo) must be 104 pica x 68 pica