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Imatest Documentation This chart features gradual density changes along horizontal scan lines (thus eliminating CRT risetime problems). What to look for (for Gamma = 2.0) Your monitor's gamma should be set for 2.2 (for Windows systems). Gamma = 2.2 for the Internet-standard sRGB color space and the popular Adobe RGB (1998) color space. 1.8 was the standard for older Macintosh systems and prepress file interchange (Mac users, see Ian Lyons' Mac Calibration page.). Most laptop LCD screens cannot be accurately calibrated because gamma is extremely sensitive to viewing angle. You can adjust gamma using Quickgamma (a great free program) or a hardware calibrator (details here). 374 of 451
Imatest Documentation Black level (brightness) Your monitor's brightness control (which should actually be called black level) can be adjusted using the mostly black pattern on the right side of the chart. This pattern contains two dark gray vertical bars, A and B, which increase in luminance with increasing gamma. (If you can't see them, your black level is way low.) The left bar (A) should be just above the threshold of visibility opposite your chosen gamma (2.2 or 1.8)-- it should be invisible where gamma is lower by about 0.3. The right bar (B) should be distinctly visible: brighter than (A), but still very dark. There is considerable interaction between the brightness and gamma settings in CRTs— increasing brightness decreases gamma-- so you may have to go back and forth two or three times. There is less interaction between Contrast and gamma. The vertical bars correspond to normalized luminances of 0.002 and 0.006 at the specified gamma. The image on the right shows the middle gamma pattern enlarged 4x. The upper part of this image, to the right of Standard, uses the same black-to-white sinusoidal variation as the Gamma and black level chart. The color patterns appear when the Alt pattern colors (T & B) box, located just to the right of the Gamma slider, is checked When this image is displayed normal size (not enlarged; below) on a good quality monitor, the R-C, G-M, B-Y, and Standard patterns appear nearly identical. Middle: Gamma pattern. This pattern will look uniform when the gamma slider (just below it) is set to the correct monitor gamma. It is very sensitive: it can measure gamma to better than ±0.05 accuracy: The spatial frequency of vertical bands is set close to the the frequency where the human eye's Contrast Sensitivity Function is maximum for typical viewing situations. The patterns on the right will appear uniform if monitor gamma is 2.2. Alt calibration pattern (middle) enlarged 4x; Alt pattern colors (T & B) checked A checkbox labeled Alt pattern colors (T & B) is located just to the right of the Gamma slider. When this box is checked, three bands (six total) appear near the top and bottom of the gamma pattern. Instead of the standard gamma pattern's normal black-to-white sinusoidal variation, individual lines vary from Blue-to-Yellow, Green-to-Magenta, and Red-to-Cyan. In a normally functioning monitor these bands appear the same neutral gray as the standard pattern, but they could look strange in a defective or poorly calibrated monitor. Unchecking this box speeds image refresh. Middle (gamma) pattern, showing R-C, G-M, B-Y color bands Right: HSL rainbow patterns. These patterns are used for a rough visual estimate of the monitor's color performance. They 375 of 451
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Imatest Documentation © 2009 Imate
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Imatest Documentation Using SFRplus
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