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Imatest Documentation detail, located in the lower right of the 1 and 2-band charts. The two and four band charts are designed to be cut into segments to be placed around the target, possibly in different orientations (landscape, portrait). Log F-Contrast chart Each chart consists of the following patterns in 1, 2, or 4 bands. From top to bottom, 1. 2. 3. Options include A bar pattern of increasing spatial frequency (which could be used to determine spatial frequency (not used in Imatest). A sine or bar pattern of increasing spatial frequency (horizontally) for all charts and decreasing contrast (vertically) for 1 and 2-band charts. The contrast is proportional to the square of the distance from the bottom of this band. That emphasizes lower contrast areas, where noise reduction causes a loss of detail. It also corresponds to the way the eye sees, i.e., when the pattern contrast is one quarter of its maximum value, it appears to be about half the maximum. The contrast is constant for the 4-band chart, which is available in Imatest Studio. (1-band chart only) 20 rectangular patches. 1 and 20 are black (0,0,0), 2 and 19 are middle gray, and 3-18 (16 patches) are a stepchart with density steps of 0.1. If the chart is printed correctly, i.e., if printer gamma matches the Test Charts setting, these patches will closely match the first 16 patches of reflective step charts with 0.1 density steps such as the Kodak Q-13 and Q-14. Standard options: Pixels per inch (PPI; 600 or 720 is recommended, depending on the printer), Highlight color, Gamma, and Height. The standard print size is 25 x (approximately) 18 cm (9.83 x (approximately) 7.08 inches; A4 paper), 25 x (approximately) 20 cm (9.83 x (approximately) 7.87 inches; US letter paper), 40 x (approximately) 28 cm (15.7 x (approximately) 11.02 inches; A3 paper), 40 x (approximately) 30 cm (15.7 x (approximately) 11.8 inches; Super A3/Super B paper). Contrast ratio and Chart lightness: Do not affect patterns with vertically-varying contrast. Type: Bar or sine (single pattern), bar or sine (double pattern), or bar and sine without contrast variation (quad pattern; available in Imatest Studio). Frequency ratio (maximum to minimum) See Log F-Contrast for recommendations. Maximum spatial frequency in cycles/width. (The actual spatial frequency will be detected by the analysis program.) See Log F-Contrast for recommendations. The two Stepchart options include a chart with 20 steps (similar to the Kodak Q-13) and with16 steps with black and middle gray bands at the ends. Both have a density increment of 0.1. They can be printed any size (small or large) and sliced into narrow strips for specialized testing. Stepcharts should be printed with care in a color-managed environment. If an ICC profile is used for printing, Black Point Compensation should be turned off. For most applications, standard charts such as the Kodak Q-13 and Q-14 are recommended for best accuracy. Zone plate (Imatest Master only) 364 of 451
Imatest Documentation Zone plates (based on Fresnel diffraction) are useful for observing aliasing, particularly Moire patterns and other image processing artifacts. They have a much larger area of high spatial frequencies than the star chart. The spatial frequency is inversely proportional to the square of the radius (the distance from the center of the pattern). The chart also contains tonal calibration patches and slanted edges for checking results with SFR. Thanks to Bart van der Wolf, who has done some interesting work with zone plates. Print sizes are the same as the star chart. Options include a divisor for the maximum spatial frequency (0.5 cycles per pixel at the outer radius when set to 1), sine or bar band pattern (sine shown on the right), pixels per inch, contrast ratio, gamma, and highlight color. Low ppi charts are useful for testing resizing performance. Scalable Vector Graphics (SVG) patterns Zone plate Imatest Master SVG charts are discussed in detail in SVG (Structured Vector Graphics) Test Charts for improved MTF measurements. Vector graphic images consist of primitives such as lines, polygons, etc., that can be scaled to any size and do not suffer from the pixellation problems of bitmap images. They print at the printer's maximum quality, regardless of size. Vector graphics are excellent for generating test charts consisting of lines, curves, and areas that don't require complex tone variations such as sine modulation. Scalable Vector Graphics (SVG) is an XML file format recognized by the World Wide Web Consortium (W3C). SVG files can be read, edited, and printed by Inkscape— an excellent free open-source program (described in Wikipedia). They can also be imported into Adobe Illustrator, Corel Draw, and others. SVG implementations are listed here. Imatest Master can create two types of SVG chart, discussed in detail in SVG (Structured Vector Graphics) Test Charts. SVG Squares & Wedges (letter, A4, ...) This was the first SVG pattern to be included in Imatest. It consists of tilted squares, "hyperbolic" wedges, bars of varying spatial frequencies, and a replica of the Kodak Q-13 step chart with density steps of 0.1. It is optimized to be printed A4 or letter size on a high quality inkjet printer and mounted on a 3x3 grid, as shown on the right— though it can be printed any size without loss of quality. In this arrangement it will have a field width of around 32 inches (80 cm), sufficient for measuring the performance of the best modern DSLRs. The chart below was created using Contrast ratio = 20, Gamma = 2.2, Highlight color = White, and Chart lightness = Light. Additional details are found on SVG (Structured Vector Graphics) Test Charts. 365 of 451
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Imatest Documentation © 2009 Imate
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Imatest Documentation Using SFRplus
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