The following images are not a smooth transitions. If you have only limited colors the above rainbow would look something like these:
If that's the case, you probably need more video RAM, or a different video board.
That's color, now let's deal with tone, brightness and contrast.
Below are four boxes. One should be absolute black. Nothing on your monitor should be darker than the black box. If your monitor has a black border, it should be as black as the black box below. And nothing should be lighter than the white box.
<-you could adjust contrast and brightness to achieve this.
"Crossover" is when your monitor's Red, Green and Blue guns don't have linear curves. The chart below has boxes that go from black, to gray, to white. No colors should be visible: no pink, yellow or green cast at all!
If the boxes pick up a color cast, one of your monitor's guns is out of adjustment. Ideally you should see every distinct box. If you have an LCD screen, move your head far to the right and left, up and down to see if the boxes change color or density.
Gamma (or contrast) is next.
This next test doesn't work on most flat LCD monitors.
(With the proliferation of LCD monitors, we will try to develop a test for them.)
Step back from your monitor.
One of these numbered boxes is about the same shade as the surrounding.
That's your "screen gamma." Many photographer's web pages are designed for 1.8 Gamma. Windows OS computers and TV monitors are calibrated for 2.2 Gamma.
Inexpensive resources to adjust your monitor's calibration are:
Monitor Calibration Wizard for Windows
SuperCal™ for Mac OS
Apple's Display Calibrator Assistant in System Preferences
Adobe Photoshop's Gamma Control Panel
How did you do? Contact me if you want help "tweaking" your screen. E-mail us at or call us at (781) 259-0064
Now, please return to our home page:
Boston editorial and advertising photographer Stanley Rowin:
www.StanStudio.com or our product photography site or our Boston Stock Photography web site.
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