another. They may be separate programs, or they may
be included in an operating system to help the user
perform these tasks. Text editors may also be included
in an operating system so the user can enter, add, delete,
or change program statements; debug routines may also
be included to help the user locate errors.
programs can be written by you, the user of a computer
system, developed by a central design agency, or they
can be purchased from a software firm. Numerous
types of applications programs are written. They range
element that a peripheral device can display on screen.
It is these individual elements that construct the image.
The quality of an electronic image is determined by the
pixels of the image--the more pixels per image, the
greater the quality of the photograph.
resolution. The image resolution depends on the
number of pixels in a specific area. For example, a
number of pixels. However, resolution is not based
solely on the number of pixels.
depict a single image. Each pixel can contain only one
color or shade of gray. The smaller the pixels (more
pixels per image), the closer the image can be viewed
before the individual pixels are seen. Likewise, larger
pixels may be objectionable. By increasing the number
of pixels, you obtain finer detail.
not directly comparable to electronic-imaging
resolution. Additionally, different types of imaging
example, some equipment describes resolution in pixels
and other equipment describes resolution in dots per
inch (dpi). Pixels and dpi are not directly related or
nonstandardization may present a problem is when
comparing images from an analog camera to the
products from a digital camera or the image output from
an electronic printer or a film recorder.
conventional photography, exposing the film is not
enough. After the image is captured on film, it must be
processed before the image can be viewed as a positive
transparency or as a negative image that must later be
printed to provide a useable positive image.
and useable are completely different. On an
electronic-imaging workstation, your "darkroom" is a
computer system. To operate an electronic-imaging
workstation, you must have both hardware and
software. There are basically five components in an
some type of input, a computer platform and software,
display, storage, and hardcopy output (fig. 3-3).
Advanced Photography Course