Imatest Documentation

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Imatest Documentation A print of Stephen H. Westin's printable vector-graphics version of the ISO 12233chart, made on the Epson 2200 at 1440 dpi on Premium Luster paper and scanned by the Epson 3200 at 1200 dpi, has been analyzed to compare slanted and straight edges. The comparison is of interest because Stephen's chart uses vector graphics, hence the slanted edge is as fine as the printer can make; it is not limited by image pixels. Straight and slanted edges where compared with the print scanned straight and tilted. Document straight Document tilted Slanted edge Straight edge Slanted edge Straight edge The straight edge is clearly smoother than the slanted edge, though the sharpness of the individual edges (horizontal scan lines) is about the same. This MTF results are surprizing: MTF50 for the slanted edge scanned straight is 4.13 cycles/mm, not very different from MTF50 for the straight edge scanned tilted, 4.24 cycles/mm. The difference is more pronounced at lower MTFs (higher spatial frequencies). MTF20 for the slanted edge scanned straight is 8.6 cycles/mm while MTF20 for the straight edge scanned tilted is 10.6 cycles/mm. I clearly perfer the straight edge, tilted. Although the numbers suggest it would make little difference, I recommend a 20% greater distance if the slanted edge is used. The results in this box are for charts printed on high quality inkjet printers. Commercially-available charts are often printed at higher resolution, and hence may be used at shorter distances— microscopic in some cases. 126 of 451
Imatest Documentation Using SFR Part 2 Running Imatest SFR Running Imatest SFR Imatest is opened by double-clicking the Imatest icon on the Desktop, the Windows Start menu, the Imatest folder (typically C:\Program files\Imatest in English language installations). After several seconds, the Imatest main window opens. Then click on SFR: New file or Rescharts on the upper left. The SFR: Current file button is grayed out (inoperative) for the first run because no file has yet been read. It can be used in succeeding SFR runs to save time when analyzing different regions, though multiple ROI (region of interest) runs are more efficient. (The input image is cleared to save memory and SFR: Current file is grayed out if another module is run.) Several cropped slanted-edge JPEG images are included in the images subfolder of the Imatest folder. Complete ISO12233 chart images are not included with Imatest because they are large (usually over 2 megabytes). They can be downloaded from dpreview.com reviews, typically in the last page titled "Compared to...," and from Imaging-resource.com reviews, typically on the page labeled "sample images." Selecting the image file (or batches of files) When you click SFR: New file from the Imatest main window or Read image file (with Slanted-edge SFR selected) from Rescharts, the window below appears, requesting the image file name(s). The folder saved from the previous run appears in the Look in: box on the top. You are free to change it. You can open a single file by simply double-clicking on it. You can select multiple files (for batch mode or combined runs with SFR in Imatest Master) by the usual Windows techniques: control-click to add a file; shift-click to select a block of files. Then click Open . Three image files for the Canon 17-40mm L lens (taken with the EOS-10D) are highlighted. Large files can take several seconds to load. Imatest remembers the last folder used (for each module, individually). In batch mode the first file is handled like a normal run; the remaining files run in express mode (no dialog boxes). File selection If the folder contains meaningless camera-generated file names such as IMG_3734.jpg, IMG_3735.jpg, etc., you can change them to meaningful names that include focal length, aperture, etc., with the View/Rename Files utility, which takes advantage of EXIF data stored in each file. 127 of 451
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Imatest Documentation © 2009 Imate
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Imatest Documentation Using SFRplus
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