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Imatest Documentation Image WxH & Mpxls 3888 2592 10.1 Channel Y Gamma 0.5 Sharpening radius 2 Pixels per inch Pixels per mm um per pixel MTF50 wtd Cy/Pxl (uncorr) 0.278 MTF50 wtd LW/PH (uncorr) 1440 MTF50 wtd Cy/Pxl (corr) 0.294 MTF50 wtd LW/PH (corr) 1525 SQF summary. SQF is the Subjective Quality Factor, described here. SQF (Subjective Quality Factor): mean values Print height Exif data Exif data Viewing dist (cm) SQF SQF_corr 1 15 99.58 99.76 2 15 98.98 99.66 3 16.43 98.45 99.62 4 18.97 98.1 99.55 5 21.21 97.75 99.45 6 23.24 97.39 99.32 File: 2008:01:02 10:34:42 Make: Canon Model: Canon EOS 40D Taken: 2008:01:02 10:34:42 Res: 3888 x 2592 FL: 85.0mm CCD: 22.25mm Exp: 0.200 s (1/5) Aper: f/5.6 ISO: 100 ExBias: 0.67 WtBal: Auto Creating Excel plots The single column summary is the last table in the multi-ROI CSV file. It contains the same data as the summary results (above), but it is formatted so it can be easily copied and pasted into another Excel file for creating plots that summarize several runs. For mult-ROI batch runs, this data is combined into a CSV output file with a name of the form, filename_Y_sfrbatch.csv. 156 of 451
Imatest Documentation Summary plot for 6 multi-ROI runs (f/5.6-f/32) for the Canon 17-85mm IS lens on the EOS-40D (JPEG) The Excel file was created by combining single-column summary results from the 6 runs. Any of the parameters in the summary can be plotted. To obtain a plot, Run a sequence of multi-ROI runs for a several apertures (or other settings if appropriate). If possible, select one ROI near the center, 4 part-way out, and 4 near the corners: 9 total as shown in the 2D summary plot, above. This is sufficient to completely characterize a lens. Be sure to save the CSV summary file, which has a name of the form {input file name}_Y_multi.csv, where Y denotes the luminance channel. If the sequence is run as a batch, a combined summary file with a name of the form filename_Y_sfrbatch.csv will be created. You may skip the next four steps. Open the first CSV smmary file (for f/5.6 in this case) in Excel. This can usually be done by double-clicking on the file name in Windows Explorer. Select and copy (ctrl-C) the first two columns of the summary results, located near the end of the CSV summary file. Open a new Excel (XLS) file. Paste the selection in the new file. Open the remaining CSV summary files in Excel. For each file, copy the second column of summary data, and paste it into the next Excel file so that it is aligned with the previous data, as shown above. In the row 2 of the new Excel file, between Summary results... and Date, (or the line labeled Plot title in the combined summary file) enter a brief description of the run to be used to label the plot, for example, f/5.6, f/8, ..., f/32 (shown above). Now you can create the plot. Select the cells for the x and y-displays. The remaining details depend on your version of Excel. For the above plot, the range of data is =Sheet1!$A$2:$G$2,Sheet1!$A$65:$G$65 . Single-column summary results (imcomplete) The parameters in the table are described here. Summary results in single column for copying and creating plots (enter description here) Date 1/9/2008 10:25 File 85mm_f5.6_IMG_5970.JPG Regions 9 Center 1 Part way 4 Corner 4 MTF50 (Cy/Pxl) Mean Ctr 0.289 R1090 (pxl) Mean Ctr 1.6499 CA (pxl)) Mean Ctr 0.3439 MTF50 (LW/PH) Mean Ctr 1498.2 R1090 (/PH) Mean Ctr 1571 Peak MTF Mean Ctr 1 MTF50P (Cy/Pxl)) Mean Ctr 0.289 MTF50P (LW/PH) Mean Ctr 1498.2 MTF20(Cy/Pxl) Mean Ctr 0.3598 MTF20 (LW/PH) Mean Ctr 1865.4 MTF50 (Cy/Pxl) Mean Pt Wy 0.2829 R1090 (pxl) Mean Pt Wy 1.8544 CA (pxl)) Mean Pt Wy 0.6765 MTF50 (LW/PH) Mean Pt Wy 1466.7 R1090 (/PH) Mean Pt Wy 1414.8 Peak MTF Mean Pt Wy 1 MTF50P (Cy/Pxl)) Mean Pt Wy MTF50P (LW/PH) Mean Pt Wy 0.2829 1466.7 MTF20(Cy/Pxl) Mean Pt Wy 0.3626 ..., etc. (The whole table is not shown.) 157 of 451
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