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Imatest Documentation A standard Windows file selection dialog appears, labelled Special Charts image file. Select an image file to open. You may, if you wish, press View ( ), Thumbnails to see thumbnails in the dialog box (illustrated on the right). This is sometimes helpful for locating the file to open. After the file is selected the Special Chart selection box, shown below, appears. A thumbnail of the input image is shown on the right. Select the chart type and the reference source. If an incorrect reference source is entered, it can be changed later in the Multicharts window. If you select Squares arranged in a circle, choose the number of squares in the pattern (7-12). If you choose OECF 20-patch circular, choose one of the following in the box below the OECF 20-patch radio button. TE 241 OECF 20-patch circular charts (more detail here) Available from Image Engineering/Esser Test Charts. Transmissive chart. 12600:1 contrast ratio. 0 ≤ density ≤ 4.1 Low contrast 20:1 From ISO/DIS 14524, Table A3. 0.1 ≤ density ≤ 1.4 Standard reflection 80:1 From ISO/DIS 14524, Table A3. 0.1 ≤ density ≤ 2.0 Normal contrast 160:1 From ISO/DIS 14524, Table A3. 0.1 ≤ density ≤ 2.3 High contrast 1000:1 From ISO/DIS 14524, Table A3. 0.1 ≤ density ≤ 3.1 If you choose ITE Grayscale, select either ITE Grayscale I: gamma = 0.45 or ITE Grayscale II: gamma = 1.0 in the box just above the ITE Grayscale radio button. The reference source can be one of the following. Default reference values (if applicable) Read from a density file Available for the monochrome charts: ST-52, QA-61, QA=62, ISO-15739, EIA Grayscale. Not for Squares arranged in a circle. For monochrome charts only. One value per line. a* = b* = 0. You will need to enter the file name. Read from a L*a*b* file Three values per line (L*, a*, b*), separated by commas (CSV format). " " 318 of 451
Imatest Documentation Read from a 5000K xyY data file Three values per line (x, y, Y), separated by commas (CSV format). " " Read from a 6500K xyY data file Three values per line (x, y, Y), separated by commas (CSV format). " " Last file: (file name if applicable) The previous file name for this type of chart, if applicable. Here is an example of an L*a*b* file in CSV (comma-separated variable) format. The format is the same for xyY files. Spaces are for visual clarity (readability) only. The numbering order of the patches is shown below. If a reference file is called for, a dialog box for entering the file name will appear after the crop boxes. Details of required file contents are found in Numbering and orientation of the patches, below. If the image is the same size and type as the previous image analyzed by Multicharts, you'll be asked if you want to use the same ROI (region of interest). If the image is a different size or type, or if you answer No, a coarse crop box appears, shown greatly reduced on the right. Select a portion of the image, or click outside the image to select the entire image. Recommended cropping for the monochrome charts is shown near the top of the page. The initial crop doesn't have to be precise: you'll have a chance to refine the crop in the fine crop box. The crop box can be enlarged or maximized to make the selection easier. 55.261, -38.342,31.37 28.778, 14.179, -50.297 65.711, 18.13, 17.81 51.038, -28.631,-28.638 51.935, 49.986, -14.574 81.733, 4.039, 79.819 42.101, 53.378, 28.19 After you have made the rough crop, the fine adjustment box appears. The original Coarse crop box (greatly reduced) crop is displayed as the red rectangle. The patch regions to be selected are the small cyan squares or rectangles. This dialog box can be enlarged or maximized to facilitate the adjustment. It offers numerous options. Fine crop adjustment The original crop is displayed as the red rectangle. The patch regions to be selected are the small cyan squares or rectangles. This dialog box can be enlarged or maximized to facilitate the adjustment. Numerous options are available.Its numerous options are described in the Multicharts instructions. Fill factor (linear) allows the size of the squares to be adjusted. The entire ROI can be moved ( ^ > v < , upper-left). The top, bottom, left, or right sides can be moved ( T^ Tv R> R< B^ Bv L> L< , middle-left). Corners can be moved individually (any of the 8 buttons in each of the four corners, middle-left). 319 of 451
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Imatest Documentation © 2009 Imate
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