Graphics Programs Reference
In-Depth Information
3
Acquiring
Digital Images
Some of the core tasks of processing digital
images involve sizing, manipulation, and pro-
cessing. Even though their contents may vary, all
digital images are essentially the same: They are
composed of pixels that contain color and lumi-
nance information. Adobe Photoshop's powerful
features allow you to adjust those pixels to better
match your needs and desires.
And although the destination may be the same,
the path your digital images take to get inside
Photoshop will vary. Some may start out as digi-
tal images acquired with a still camera, whereas
others may be archival images loaded via a scan-
ner. You might also search online websites to find
specialized images. Let's take a look at the many
ways to acquire image files that can be loaded
into Photoshop and manipulated.
Pixels in detail: When you zoom into an image at 1600%
magnification, the pixels are very easy to see. You can open
the photo CH03_Owl.tif from the Chapter 3 folder and use
the Zoom tool (Z) to magnify the image. In fact, you can
zoom up to 3200%, which makes pixel viewing quite easy.
To toggle the visible grid at high magnifications, choose
View > Show > Pixel Grid.
Digital Cameras
This topic will not teach you how to use your
digital camera. Many excellent topics on that
subject as well as classes are offered. What this
book will address is how the pixels are con-
verted, what file format you should choose to
shoot your images, and how to transfer them
to your computer.
Sensors in a digital camera acquire an image
by converting light into pixel data.
 
 
 
 
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