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Imatest Documentation There are no limits. With moderate skill you can plot columns of results. I've said enough. ( I'm not an Excel expert! ) Database files Two .CSV files are used as a database for storing data from SFR runs. If possible, data from the current run is appended to these files. A third file for storing MTF and other summary data is described below. SFR_cypx.csv displays 10-90% rise in pixels and MTF in cycles/pixel (C/P). SFR_lwph.csv displays 10-90% rise in number/Picture Height (/PH) and MTF in Line Widths per Picture Height (LW/PH). When SFR is run, it looks for the two files in the same folder as the slanted-edge input image. If it doesn't find them, it creates them, writes the header lines, then writes a line of data for the run. If it finds them, it appends data for the run to the files. You can rapidly build a spreadsheet by doing repeated runs from files in the same folder. The following table contains the entries. Camera and the entries that follow are all optional. With the exception of Loc, which is calculated when the ROI is manually selected, they are only added if you answer y to the question, Additional data for Excel file?, and enter them manually. Tips File File name. Should be concise and descriptive. Date/time Date and time in sortable format. Displays differently in Excel. PH Picture Height (in SFR_lwph.csv only). Ch Channel. Y (luminance) [default], R, G, or B. H/V Horizontal or Vertical measurements. (A vertical chart gives you horizontal rise and MTF, etc.) 10-90U 10-90% rise distance, uncorrected. 10-90C 10-90% rise distance, corrected with standard sharpening. Overshoot% Overshoot of the edge. Oversharp% Oversharpening: the amount of sharpening relative to the standard sharpening. If negative, the image is undersharpened. MTF50U MTF50 (frequency where MTF = 50%), uncorrected. MTF50C MTF50 (frequency where MTF = 50%), corrected with standard sharpening. MTF Nyq MTF at Nyquist frequency. May indicate the likelihood of aliasing problems. But it not an unambiguous indicator because aliasing is related to sensor response, and MTF at Nyquist is the product of sensor response, the demosaicing algorithm, and sharpening, which can boost response at Nyquist for radii less than 1. Camera Camera name. This entry and those that follow are manually-entered and optional. Lens Lens name. Only for DSLRs with interchangeable lenses. FL (mm) Focal length in mm. f-stop Aperture Loc Location of image (center, edge, corner, etc.) Misc. settings Anything else: RAW converter, Sharpening setting, etc. To build a spreadsheet of results, put the slanted-edge image files in the same folder. File names should be concise and descriptive. If you've run SFR from image files in different folders, there will be multiple versions of the CSV files. They can be easily combined with a text editor on in Excel. Neither SFR_cypx.csv nor SFR_lwph.csv should be open in Excel when you run SFR. If either is open, an error message will appear instructing you to close them. Summary .CSV and XML files for MTF and other data 140 of 451
Imatest Documentation An optional .CSV (comma-separated variable) output file contains results for MTF and other data. Its name is [root name]_[channel location]_MTF.csv, where channel is (R, G, B, or Y) and the location BL75 means below-left, 75% of the distance to the corner (from the center). An example is Canon_17-40_24_f4_C1_1408_YBL75_MTF.csv. Excerpts are shown below, opened in Excel. The format is as follows: Line 1 File File name (title). Run date mm/dd/yyyy hh:mm of run. (blank line) Tables (blank line) Additional data (blank line) EXIF data A portion of the summary CSV file, opened in Excel Imatest, release (1.n.x), version (Light, Pro, Eval), module (SFR, SFR multi-ROI, Colorcheck, Stepchart, etc.). Separated by blank lines if more than one. Two tables are produced. The first table contains MTF. The columns are Spatial frequency in Cy/mm, LW/PH, MTF (selected channel), MTF (Red), MTF (Green), MTF (Blue), MTF (Luminance = Y). (...) represent rows omitted for brevity. The second table contains the edge. Columns are x (location in pixels), Red edge, Green edge, Blue edge, Luminance (Y) edge, and Chromatic Aberration (the difference between the maximum and minimum). The first entry is the name of the data; the second (and additional) entries contain the value. Names are generally self-explanatory (similar to the figures). Displayed if available. EXIF data is image file metadata that contains important camera, lens, and exposure settings. By default, Imatest uses a small program, jhead.exe, which works only with JPEG files, to read EXIF data. To read detailed EXIF data from all image file formats, we recommend downloading, installing, and selecting Phil Harvey's ExifTool, as described here. This format is similar for all modules. Data is largely self-explanatory. Enhancements to .CSV files will be listed in the Change Log. The optional XML output file contains results similar to the .CSV file. Its contents are largely self-explanatory. It is stored in [root name].xml. XML output will be used for extensions to Imatest, such as databases, to be written by Imatest and third parties. Contact us if you have questions or suggestions. An optional .CSV file is also produced for multiple ROI runs. Its name is [root name]_multi.csv. Pixel size Sensor Diagonal Width Height Designation mm. mm. mm. 141 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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Imatest Documentation MTF50 in Line
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