Graphics Programs Reference
In-Depth Information
Figure 24
and
Figure 25
will make you more familiar with the capabilities of the
Image
Size Window
, but I want to emphasize one thing before we get into it.
Any time the “Resample” box is checked, Photoshop will PERMANANTLY alter the im-
age file by discarding pixels or creating them. This is not a reversible process.
For this reason, it is prudent to only check this box when you are working with a copy of
the Image File. Keep the original file archived in a safe place.
The image produced by one of my cameras is 4752 pixels by 3168 pixels —
Figure 24
.
These numbers are determined by the Sensor that is used in this camera. If you multiply
the height by the width, you get:
4752 X 3168 = 15,054,336 This is approximately 15 million pixels or 15 Megapixels.
Thus, my camera can be referred to as a 15-Megapixel camera.
Please note that the physical size of the Sensor is far more important than the number of
pixels with respect to image quality. Sensor size is the primary cost-factor in digital camer-
as. Sensors in DSLR cameras are typically 20 to 40 times as large as sensors in inexpens-
