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Imatest Documentation Upper left: MTF50 (Half-contrast frequency) This plot shows MTF50 (the half-contrast spatial frequency) as a function of distance from the center of the image, scaled as the percentage from center to corner (0 = center; 100 = corner). There are two vertical (y) axes. The primary axis is on the left; the secondary axis (italicized) is on the right. These alternate for the two plots. In this plot, the primary axis is in Cycles/pixel for MTF50 and Pixels for 10-90% rise distance. It can also be in Cycles/mm or Cycles/inch if specified in the SFR data window. Black line (bold) Red line (bold, dashed) Symbols and numbers below data points, top to bottom MTF50 (half-contrast spatial frequency) for the luminance (Y) channel. Unprocessed. This is the number to use for measuring lens sharpness. MTF50 for the luminance (Y) channel with Standardized sharpening. This is the number to use when making general comparisons of different cameras with different degrees of sharpening. Orientation: Location of region relative to image center. A = Above, B = Below, L = Left, R = Right. MTF50, Uncorrected and with Standardized sharpening, in units corresponding to the primary vertical (y) axis scale on the left. The vertical order is determined by the order of the data points, i.e., if the Uncorrected MTF50 is higher, its value is on top. MTF50, Uncorrected and with Standardized sharpening, in units corresponding to the secondary vertical (y) axis scale on the right. These numbers are italicized. The vertical order is determined by the order of the data points, i.e., if the Uncorrected MTF50 is higher, its value is on top. Right column: Crop, Results summary, and EXIF data Top right image Thumbnail of the entire image, showing the locations of the selected regions of interest (ROI) in red. Middle right box: Weighted MTF50 Results summary Summary of key results of multiple ROI runs: Weighted mean values for MTF50, in cycles per ... and LW/PH units, without and with standardized sharpening. The MTF value at the middle of each (sorted) line segment is weighted according to the length of the line segment and the distance from the center: the center is weighted twice as strongly as the corner. These weights are used to calculate a weighted mean. This algorithm prevents closely spaced points from being given excessive weight. Lower right text Selected EXIF data: Data recorded by the digital camera. Only for JPEG files. May include ISO speed, aperture, and other details. Thanks to Matthias Wandel for jhead.exe. Lower left: 10-90% Edge rise distance Black line (bold) Red line (bold, dashed) .Blue line (bold, dashed) with yellow circles. The 10-90% rise distance, uncorrected (without Standardized sharpening). The 10-90% rise distance, with Standardized sharpening. Chromatic aberration (Area-based) in pixels. An indicator of the severity of CA. The area between the channels with the highest and lowest levels. In units of pixels because the x-axis is in pixels and the y-axis is normalized to 1. Explained in detail in the page on Chromatic aberration. Meaning: 152 of 451
Imatest Documentation The Legend at the lower right of the 10-90% Rise distance plot sometimes covers data points. It can be moved by clicking and dragging it with a mouse. When the SQF (multi) checkbox in the SFR input dialog box has been checked, a multiple ROI SQF Figure is produced. The upper plot shows SQF without standardized sharpening (unprocessed) for picture heights from 10 to 60 cm. The lower plot shows SQF with standardized sharpening (R = 2). Weighted SQFs are shown in the table on the right. The weighting formula is the same as the one used for MTF: readings near the center are given twice the weight of readings near the edge. CSV output file The CSV output file has been upgraded (version 2.6.1, January 2008) to facilitate the handling of a large volume of results and creation of Excel summary plots that combine results of several runs. It is designed to be opened in Excel. The following data shows the contents of the CSV file for the Canon 17-85 IS lens tested on the EOS-40D. It has been imported from Excel. Header shows version, input file, and run date Imatest 2.6.1 Pro SFR multi-ROI File 85mm_f5.6_IMG_5970.JPG Run date 1/9/2008 10:25 Summary plot Geometry & file shows the Regions of interest (ROIs) in pixels and the CSV summary files for each location. Geometry & file: changed with Imatest 2.5.8. Origin at upper left. 153 of 451
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