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Imatest Documentation should appear well-saturated and have smooth color and tonal gradations (no abrupt changes). Laptops typically look very different from well-calibrated LCD or CRT monitors. Gamma pattern (full screen) The full screen gamma pattern allows you to examine screen uniformity in fine detail. It is identical to the gamma pattern in the middle of the Monitor calibration display, described above. Gamma can be estimated with excellent accuracy: to better than ±0.5.Hightlight H, S, and L can be controlled with the sliders on the far left. Reset pattern restores default values: H = 0, S = 0, L = 1, and Gamma = 2.2. Zone plate Full screen gamma pattern for viewing screen nonuniformities. (Actual image looks very different) The zone plate is useful for testing camera focus in cameras with live view because it produces highly visible moiré patterns when it is photographed or resized; the stronger the moiré the better the focus. It works best with the window maximized (it may need to be redrawn after resizing.) Northlight Images describes a way of using the zone plate to tune the focus of the Canon 1Ds Mark III. The Squares patterns below are also designed to generate moiré. Screen Patterns has two versions of the zone plate: sine (shown below) and bar (with stronger edges: possibly better for focusing). Zone plate pattern The maximum spatial frequency can be adjusted with the menu on the bottom right. 1/4 cycles/pixel (half-Nyquist) is the default. Highlight H, S, and L can be controlled with the sliders on the far left. (The H slider was obscured when the image was resized.) 376 of 451
Imatest Documentation Reset pattern restores default values: H = 0, S = 0, L = 1 and also redraws the image. Learn more about zone plates from Bart van der Wolf. SMPTE color bars SMPTE color bars are widely used in the video industry for calibrating TVs and monitors. They're included in Screen Patterns as an experiment— to see if customers find them useful. It's straightforward to add charts to Screen Patterns: please contact us if you have a chart you'd like added. SMPTE color bar (original) SMPTE color bar (HD) SMPTE color bar (original LIGHTENED): upper section lightened The pixel values for the charts are from the Wikipedia page, SMPTE color bars. We are not certain of their correctness. Many pages interpret these bars differently (the colors in the top row are often brighter). Both the original and HD charts can be displayed with the top row of colors lightened. Slanted edges (1, 2, and 3 rows) These slanted edge patterns are similar to the patterns in SFR SVG Test charts. 1, 2, and 3 row patterns are available. H, S, and L (Hue Saturation, and Lightness) can be adjusted for the highlights (i.e., the background), and L can be adjusted for the patches, which retain the same H and S values as the background, similar to SFR Quads: Global H,S , described in SFR quadrant patterns, above. Contrast is displayed on the lower right. It is important to note that these edges are not as sharp as the vertical and horizontal edges in SFR quadrant patterns because a small amount of anti-aliasing must be applied to avoid jagged edges. These patterns are not generally recommended for testing high resolution cameras, where large printed charts work far better, but they may be useful in testing monitors, projectors, and low resolution cameras. If all cases, you should carefully analyze the relative contributions of the display, camera, and lens to the final MTF measurement, i.e., you should know precisely what you are measuring. 377 of 451
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Imatest Documentation © 2009 Imate
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Imatest Documentation Using SFRplus
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