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Imatest Documentation Using Screen Patterns Monitor patterns for Light Falloff, SFR, Distortion, and monitor calibration Introduction Screen Patterns displays a variety of test patterns on monitors, preferably on LCD flat screen monitors. It is opened by clicking on Screen Patterns on the right of the Imatest main window. Most patterns (except perhaps Monitor calibration) perform best with the window maximized. You may need to redraw the pattern after maximizing (or resizing) it by selecting the pattern or changing one of the settings. These patterns are offered as a convenient alternative to the printed patterns created by Test Charts, and in one case— Light Falloff— the use of Screen Patterns is superior to other techniques. The test patterns fall into two categories: patterns that can be photographed for analysis by Imatest modules, including Light Falloff, Distortion, and SFR, and patterns for checking monitor calibration, estimating monitor performance (and a few other uses). The pattern is selected with a dropdown menu in the bottom-middle of the Screen Patterns window. The patterns intended for photographing tend to work poorly with CRTs because of the raster scan, which can cause nonuniform illumination and may cause inconsistent readings with some DSLR metering systems (like my Canon EOS-40D). The patterns are summarized in the table below. Patterns to be photographed for Imatest analysis (not recommended with CRTs) Light Falloff (blank) Blank screen for obtaining even illumination. Superior to other low-cost techniques. SFR Quadrants SFR quadrant pattern: you must tilt the screen relative to the camera to photograph it. SFR Quads: Global H,S Distortion grid Distortion grid inverted Slanted edges (1, 2, and 3 rows) Monitor calibration Monitor gamma only Zone plate (sine) Zone plate (bar) SFR quadrant pattern where darker (quadrant) areas have the same H and S as the highlight area (normally the darker area is neutral). A large LCD flat screen monitor is a definite asset with this module. Similar to the patterns in SFR SVG Test charts. 1, 2, and 3 row patterns are available. Not as sharp as the SFR quadrant patterns (with vertical, horizontal edges). Use with care; not for testing high resolution cameras. Miscellaneous: for monitor calibration or camera adjustment This selection contains several patterns: A gamma/black level test pattern that allows you to estimate gamma, A monitor gamma pattern that looks uniform when the adjacent slider is set to the correct gamma, and Two HSL rainbow patterns that can be used for a rough visual estimate of color quality. The monitor gamma pattern fills the entire screen. It is adjusted with a slider at the bottom-center. It allows you to determine gamma with high accuracy and see variations across the screen. For finding optimum camera focus using strongly visible moiré patterns. Sine and Bar options are available. SMPTE color bars Widely used for video adjustments. May be used for a simple visual analysis of color quality. Colorchecker and Stepcharts Simulated Colorchecker and Stepcharts: 20 steps with 0.10 and 0.15 density steps (1.95 and 3.85 maximum densities). NOT for camera testing. Some of these patterns have no well defined uses, but we include them because customers often find uses we cannot anticipate. Adding charts to Screen Patterns is relatively straightforward. Please contact us if you'd like to have one added. Several patterns display the W x H screen size in the lower right corner. H is smaller than the total screen size by about 21 pixels: about the hight of the upper toolbar. Light Falloff pattern If you have a flat screen LCD monitor, the Screen Patterns Light Falloff pattern is the best way of obtaining an even, uniform image. This is the first pattern that appears when you open Screen Patterns. 370 of 451
Imatest Documentation Light Falloff image (initial screen at startup) Maximize this pattern for best results. Hue, Saturation, and Lightness (H, S, and L, which default to 0,0,1) can be adjusted using the sliders on the far left. HSL and RGB values are displayed at the bottom. Photograph it at a distance of 1-3 inches (2-8 cm). (Thanks to Jonathan Sachs for this suggestion.) For extreme wide angle lenses or laptop screens with a limited viewing angle, an additional diffuser should be used. We recommend using opal diffusing glass mounted close to the lens. Opal glass is available in the US from Edmund Optics. (Thanks to Bart van der Wolf for the suggestion.) If a diffuser is used, a lightbox may be substituted for the monitor. (Lightboxes are typically brighter but less uniform.) SFR patterns There are two quadrant patterns for SFR measurements: SFR Quadrants,where the darker area is neutral, and SFR Quads: Global H,S, where the darker area has the same Hue (H) and Saturation (S) as the highlight area. The monitor should be tilted (typically around 5 degrees) with respect to the camera when this pattern is used for SFR measurements. (The pattern itself is not tilted because this would result in pixellation.) This use of this pattern is discussed in Imatest SFR LCD target. SFR pattern (Global H,S): Shown in pure green with 10:1 contrast. (Default is White and Black.) Highlight H, S, and L can be controlled with the sliders on the far left. Quadrant Lightness (L) can be controlled with the slider on the bottom-right. The contrast for display gamma = 2.2 is shown on the lower right. In this case (pure green; not the default), the lower right slider has been adjusted for a 10:1 image contrast. The L slider on the left is set to 0.5 for maximum color saturation. 371 of 451
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