There are
three categories of digital cameras on the market today. They are
commonly referred to as; "Point and Shoot", "Semi-Pro" medium resolution
and high resolution "Professional". The cost range is:
|
|
|
| Category |
Resolution |
Cost |
| Point & Shoot |
1 - 8 mega
pixels |
$200 - $500 |
| Semi-Pro |
8 - 10 mega pixels |
$500 - $1000 |
Pro-sumer or
Professional |
> 10 mega
pixels |
$1000 and up |
The decision as to which camera to buy
should be based on whether you intend to produce images for print as well
as Internet publishing. If you are publishing for the web only, a
"top of the category" Point & Shoot or Semi-Pro will provide excellent
results. Obviously a higher cost camera in the Semi-Pro category will do
an excellent job, but you will be paying a higher price for resolution
that you will not use.
The only reason to purchase a Semi-Pro
camera for web only publishing is that these cameras provide improved
control over "white balance" and metering
functions.
The correct choice of camera for
publishing images to print as well as Internet is dependent on the size of
the printed image. If you will be printing small images no more than 3"x3"
then a 3-5 mega pixel resolution will produce excellent results. If you
will be printing large half to full page images, a 5-6 mega pixel camera
may not have sufficient resolution. For large prints like 11 x 17 we
recommend 8 mega pixel minimum. This is somewhat dependant on your
subjects and the sharpness required.
When purchasing a camera for flash
photography, the camera must have a "Hot Shoe" or 'PC' type connector and
the manual should indicate that the camera is suitable for "external or
studio" flash lights.
Camera Resolution and the web
- Resolution, measured in millions of pixels, is the primary factor in
determining image sharpness and printed presentation size. The most
important factor in web publishing is that a computer screen and a
"browser window" has a limited resolution of under 1 mega pixel. For
example a "full screen" web image of 800x500 pixels is only 0.4 mega
pixels. It is not reasonable to publish images larger than this because it
will force most viewers to scroll around the image to see it, and the
viewer will not have a sense of the object. A 4-5 mega pixel image taken
with a Semi-Pro camera will typically be reduced to 0.2 mega pixels so
therefore the 4-5 mega pixels is overkill. We suggest that if you purchase
a medium resolution camera for web publishing, that you set the image size
to about 1280x960.
Camera resolution and print publishing
- When publishing to print media resolution is king. the rule of thumb is
purchase as much resolution as you can afford. A 5-8 Mega pixel
camera can produce some remarkable printed images and may be all of the
resolution that you need.
White Balance
and Color Temperature - A primary objective in photography is to
accurately replicate colors of the subject. "White balance" is a digital
camera function to correct for color shifting resulting from different
light sources. All light sources have a specific color temperature
measured in degrees Kelvin. For example incandescent light bulbs have a
temperature of about 2700K and daylight can vary depending on location and
time of day from 3000K -10,000K with mid day temperature of about 5500K.
One of the advantages of digital cameras
over film is the ability of the camera to compensate for different color
temperatures thereby allowing for more accurate color replication.
Digital cameras vary widely in the methods and features to control
color temperature, with more expensive cameras having superior controls.
Almost all digital cameras have an "auto white balance" function which is
optimized for daylight imaging. We do not recommend using a cameras "Auto
White Balance" with studio lighting.
Semi-Pro to Professional digital cameras
have intricate options for controlling white balance and therefore, when
set properly, they will more accurately replicate colors. We have found
that these cameras are far superior in managing color replication and
therefore we recommend them for most users.
All digital cameras are imperfect in
color reproduction. Setting a Custom White Balance is very good, but never
perfect. If you want perfect color, you need
QP Colorsoft. |