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Imatest Documentation The SFRplus chart The preview looks jagged because the preview image lacks anti-aliasing. Although we recommed purchasing the SFRplus chart from the Imatest Store, you can print it yourself if you have a widebody photographic-quality inkjet printer. The Test Charts window for creating the standard SFRplus test chart is shown below. Several options, most importantly different grids (4x7, 5x7, 5x9, and 7x11) and square contrasts, are compatible with SFRplus. These options are listed below. Test Charts window, showing settings for the standard SFRplus chart. Additional settings are listed below. Valid options. The standard values are enclosed in brackets [...]. Pattern: [5x9] SVG Squares, 4x7, 5x7, 5x9, 7x11. The numbers on the right are the minimum recommended size when printed on inkjet printers. Highlight color: [White] White is preferable in most cases, but additive and subtractive primaries may be selected. Contrast ratio: [10] Values above 20 are not recommended because clipping can become a frequent occurrence. 386 of 451
Imatest Documentation Contrast (alt): [2] Alternate contrast for a few squares (four in the above image).Useful because signal processing is not uniform in most digital cameras: maximum sharpening (high spatial frequency boost) takes place in the vicinity of contrasty features and there is less sharpening (or noise reduction, which is the opposite of sharpening lowpass filtering) when there are no contrasty features in the neighborhood. When signal processing is nonuniform low contrast edges have different (lower) MTF than contrasty edges. Gamma: [2.2] Gamma (contrast) used for printing. For sRGB or Adobe RGB (both common Windows color spaces), use gamma = 2.2 Added graphics: [SQ-20 stepchart, Bars] This includes a 20-step (5x4) stepchart with density increment of 0.1 and bars for measuring distortion. Future versions of SFRplus will also support the SQ-16 stepchart (4x4 geometry; density increment = 1). Chart Lightness: [Light] Lightness outside of the squares. Typically Light. Invert Lt/Dk: [Normal] (always). Lightness (alt): [Light] Lightness near the alt contrast squares. Specify the folder and file names in the boxes on the lower right, then click Create test chart to save the chart in SVG format. Print the chart following Instructions in below. Prints should be made with photographic quality inkjet printers on high quality paper: semigloss, luster, or smooth coated matte. Print (paper) size can be as small as13x19 inches for low resolution images (under 3 megapixels), but chart width should be at least 24 inches for compact digital cameras) and 38 inches (which fits nicely on 40 inch foam board) for DSLRs and other cameras with 10+ megapixels. Be sure the edges look clean and sharp to your eyes; examine them with a good magnifier or loupe. Chart quality is described in detail in Chart quality and distance. If you choose to print the chart we strongly recommend that you be familiar with high quality colormanaged photographic printing. You'll need a widebody photographic-quality inkjet printer. Instructions are complex and should be followed with care. NEVER print charts on plain bond paper. Edge quality is poor and test results tend to be more indicative of (poor) chart quality than the system under test. The printed chart should be mounted on 32x40 or 40 x60 inch sheets of 1/2 inch (12.5 cm) thick foam board with spray adhesive or double-sided tape. 1/2 inch foam board stays flatter than standard 1/4 or 3/8 inch board. Printing SVG charts SFG charts can usually be printed directly from Inkscape. In cases where the image can't be framed properly (we've had success with Inkscape 0.45 but trouble with 0.46), images can be converted to bitmap format (PNG file) and printed from an image editor, as described below. A reader has reported success in printing from Adobe SVG Viewer, which will not be supported after January 1, 2009. You should always preview printed images prior to issuing the final print command. Printing from Inkscape Download and install Inkscape. Version 0.45 or higher is recommended. To access the excellent built-in tutorials, open Inkscape and click Help , Tutorials . Run Imatest Test Charts to create an SVG chart or download one of the SVG charts available above. Be sure to choose an appropriate folder and file name. The file extension is svg. Open the saved SVG file with Inkscape. You may want to do light editing. For example, to create a mirror image, select the chart image and click Object , Flip Horizontal . You can right-click on the selected chart, click Ungroup, then rearrange the chart to meet your needs. Set the print options. The settings for correct printing are somewhat complex. 387 of 451
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Imatest Documentation © 2009 Imate
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Imatest Documentation Using SFRplus
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Imatest Documentation Image Quality
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