Advanced Photography Course

Figure 3-13.--Photoshop and PhotoStyler tools.

television interviews where people do not want their
identity revealed.

COLOR CORRECTION

Imageediting programs also offer color correction

and calibration features. These color correction
features allow you to modify an image to get the best

possible quality to a color printer or other output device

(fig. 3-16). These color corrections are accomplished
by using a gamma curve.

The gamma curve represents the pixel values in the

original image on the horizontal axis. The
corresponding values of the displayed image are
represented on the vertical axis. Separate red, green,
and blue lines may be displayed so you can modify each
color independently. By increasing the slope, you can
raise the contrast level; this forces most of the pixels
toward the light and dark ends of the spectrum. By
raising or lowering the entire line, you can adjust the
brightness.

TRANSMITTING DIGITAL IMAGES

One of the biggest advantages of electronic imaging

is time. After a photograph is taken, it can be
transmitted anywhere in the world in a matter of

seconds. This makes images available immediately.
This immediacy is both critical and valuable to civilian
media teams and military organizations. With

electronic imaging, there is no film processing or
printing. What you need to do is activate a transmitter
and send it.

Several methods of transmitting electronic images

are used. One method of transmitting the image is using
the Sony Digital Information Handler with the Kodak
DCS 100. The Sony Digital Information Handler is a
digitizer and transceiver that can be connected to a
phone line or uplinked to a satellite. This unit uses a
still-video camera and 2-inch floppy disk.

Another method of transmitting images is by use of

the Kodak DCS 200. This unit can be hooked to a laptop
computer, such as a MacIntosh Powerbook, to
accomplish the same methods of transmission.

Companies, such as Harris Corporation and

Phototelesis Inc., have built rugged, portable image
processing workstations that are compatible with
standard U.S. Navy communication systems and
encryption devices. These devices provide a secure
means for transmitting tactical intelligence images
worldwide.

One problem you may encounter when attempting

to transmit images is locating a clear phone line or an
available satellite. A clear phone line is necessary to
ensure that a good image is transmitted.

Another factor you must consider when

transmitting images is the amount of time you are tying
up the circuit. The larger the file size, the longer it takes
to transmit the file. It is good practice to compress files
before transmission. When files are received at the
other end, they can be decompressed without loosing
quality.

You can see the major advantages of electronic

imaging. Images that used to take days or even weeks
to obtain can now be obtained in minutes.

ETHICS AND THE ELECTRONIC

IMAGE

The adoption and popularity of electronic imaging

raises important ethical questions. The altering of
images has existed since the beginning of photography.

3-17

contents

Advanced Photography Course

<- previous page

next page ->


DOFMaster for Windows On-line Depth of Field Calculator DOFMaster for Mobile Devices On-line Depth of Field Table Hyperfocal Distance Chart Articles FAQ Recommended Books Support Contact Links Home As an Amazon Associate I earn from qualifying purchases.	contents <- previous page next page -> Figure 3-13.--Photoshop and PhotoStyler tools. television interviews where people do not want their identity revealed. COLOR CORRECTION Imageediting programs also offer color correction and calibration features. These color correction features allow you to modify an image to get the best possible quality to a color printer or other output device (fig. 3-16). These color corrections are accomplished by using a gamma curve. The gamma curve represents the pixel values in the original image on the horizontal axis. The corresponding values of the displayed image are represented on the vertical axis. Separate red, green, and blue lines may be displayed so you can modify each color independently. By increasing the slope, you can raise the contrast level; this forces most of the pixels toward the light and dark ends of the spectrum. By raising or lowering the entire line, you can adjust the brightness. TRANSMITTING DIGITAL IMAGES One of the biggest advantages of electronic imaging is time. After a photograph is taken, it can be transmitted anywhere in the world in a matter of seconds. This makes images available immediately. This immediacy is both critical and valuable to civilian media teams and military organizations. With electronic imaging, there is no film processing or printing. What you need to do is activate a transmitter and send it. Several methods of transmitting electronic images are used. One method of transmitting the image is using the Sony Digital Information Handler with the Kodak DCS 100. The Sony Digital Information Handler is a digitizer and transceiver that can be connected to a phone line or uplinked to a satellite. This unit uses a still-video camera and 2-inch floppy disk. Another method of transmitting images is by use of the Kodak DCS 200. This unit can be hooked to a laptop computer, such as a MacIntosh Powerbook, to accomplish the same methods of transmission. Companies, such as Harris Corporation and Phototelesis Inc., have built rugged, portable image processing workstations that are compatible with standard U.S. Navy communication systems and encryption devices. These devices provide a secure means for transmitting tactical intelligence images worldwide. One problem you may encounter when attempting to transmit images is locating a clear phone line or an available satellite. A clear phone line is necessary to ensure that a good image is transmitted. Another factor you must consider when transmitting images is the amount of time you are tying up the circuit. The larger the file size, the longer it takes to transmit the file. It is good practice to compress files before transmission. When files are received at the other end, they can be decompressed without loosing quality. You can see the major advantages of electronic imaging. Images that used to take days or even weeks to obtain can now be obtained in minutes. ETHICS AND THE ELECTRONIC IMAGE The adoption and popularity of electronic imaging raises important ethical questions. The altering of images has existed since the beginning of photography. 3-17 contents Advanced Photography Course <- previous page next page ->	As an Amazon Associate I earn from qualifying purchases.
	WWW.DOFMASTER.COM © 2006 Don Fleming. All rights reserved.