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Imatest Documentation SVG Squares and Wedges pattern Chart details: The edges in the center square and the solid on the lower right are tilted approximately 5.7 degrees (arctan(0.1) ) for use in SFR. The converging line patterns ("hyperbolic" wedges) are intended for viewing moiré patterns: colors resulting from aliasing near the Nyquist frequency. They will eventually be analyzed in a module that includes the CIPA DC-003 measurements . The high frequency pattern goes from 400 to 2000 line widths/box height (LW/BH), where "box height" is the distance from the top to bottom of the active chart area (the rectangle just inside the outer rectangle, which represents the entire page). The low frequency pattern goes from 50 to 500 LW/BH. To convert to line widths per picture height (LW/PH), multiply LW/BH by the vertical pixel count and divide by the number of vertical pixels in the box. Some scale marks are omitted because of chart crowding. The bar patterns on the left and right vary in spatial frequency from about 50 to 2000 LW/BH. They are uncalibrated. The step chart pattern on the right has density steps of 0.1 if the image is printed correctly: it is a replica of the Kodak Q-13 chart. If the printout is correctly calibrated, i.e., if the printer actually prints with the specified gamma, a Kodak Q-13 chart placed adjacent to the pattern will have identical tones (by visual inspection or scanner image readout). In this case, the printed chart contrast (10 in the above example) will be as specified. Two charts are available for download. Each is 304 KB (SVG) or 500 KB (PDF— for those of you who don't want to bother installing Inkscape). Right-click on the links to save the file. Contrast = 20, light, gamma = 2.2, white highlights (SVG) | Contrast = 20 (PDF) High enough contrast to excite maximum sharpening in most cameras but low enough to avoid clipping in most cases. Contrast = 2, middle, gamma = 2.2, white highlights (SVG) | Contrast = 2 (PDF) Relatively low contrast: little, if any, sharpening would be expected. The two charts should have the same MTF if little or no nonlinear processing is applied, for example, with RAW files with dcraw conversion. The high contrast (20:1) chart may be too contrasty for some cameras— highlights and/or shadows may clip. Chart contrast can be edited by opening the chart in Inkscape and selecting the white area of the image. A message at the bottom of the window will say something like, "Group of 5 objects in root." Rght-click, select Ungroup, click outside the object, then click inside the white area again. Now the message at the bottom will say something like, "Group of 548 objects in root." Again, right-click, select Ungroup, click outside the object, then click inside the white area. This time the message at the bottom should say, "Group of 1 object." Click on Object, Fill and Stroke... Select the Fill tab and click on the Flat color box (to the right of X). Click on the HSL tab. The original value of L should be 243 for this chart (it may not display). Set L for a a lower value. Around 200-220 should work well, even for very contrasty cameras. The final contrast for charts printed at gamma = 2 2 is (L/62) 2.2 . Operation 382 of 451
Imatest Documentation To run Test Charts, run Imatest and click on Test Charts in the Imatest main window. The following dialog box, shown for a 5x9 SVG grid pattern, appears. The available settings change for different patterns. Pattern selections for the SVG charts are shown in boldface on the left. Test Charts input dialog box for SVG patterns Pattern selections SFR: quadrants SFR: 2 rectangles Grid Star Log frequency-contrast Zone plate SVG Squares & Wedges (letter, A4...) SVG Squares 1x2 (letter, A4...) SVG Squares 2x3 (>=A3) SVG Squares 3x5 (>=Super A3/B) SVG Squares 4x7 (>=Super A3/B) SVG Squares 5x7 (>= 50 cm (20") h) SVG Squares 5x9 (>= 50 cm (20") h) SVG Squares 7x11 (>= 60 cm (24") h) SVG Squares 2x3 (Same orientation) Select the Pattern (the type of chart), the options, and the folder (directory) and file name for the test chart file. When you are ready to create the file, click on Create test chart . You may cancel by clicking on Close . When the calculations are complete a figure showing the chart (not for printing) appears. You can zoom in to see the fine detail. The figure with the image of the chart is for preview only: it shows you what the chart looks like and lets you zoom in if you want. Do not print the chart directly from this figure. To print SVG charts, load the Print Test SVG output file (chart_temp.svg in the above example) into an editor that supports SVG. (Inkscape is recommended; Adobe Illustrator, Corel Draw, and others can also be used.) This will allow you to select the size of the print, add annotations, use color management, etc. Options Pattern Two types of SVG pattern are available: Squares and Wedges (shown on the right; described above), and squares on a grid (1x2, 2x3, 3x5, 4x7, 5x9, or 7x11; described above). The Squares and Wedges pattern and the 1x2 patterns are designed to be printed small (letter-sized or A4) and mounted in a grid arrangement (typically 3x3) to be photographed. The other grid patterns (3x5 and larger) are designed to be printed larger. The 5x9 and 7 x11 charts are particularly well suited for large format (24 inch and greater) printing. The 2x3 (same orientation) chart is designed to be printed up to Super A3/B (13x19 inches) and placed near the corners of a large target (typically 40x60 inches; 1x1.5 meters). This requires that two of the charts be printed as mirror images, which can be obtained in Inkscape by selecting the chart then clicking on Object , Flip Horizontal . Highlight color 383 of 451
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Imatest Documentation © 2009 Imate
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Imatest Documentation Using SFRplus
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