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Imatest Documentation 3. When LSF is selected, LSF variance (σ 2 ), which is proportional to the DxO blur unit, is displayed. Edge pixel profile is proportional to the edge profile in pixels, which includes the effects of gamma encoding. Chart contrast For a medium or low contrast charts (contrast
Imatest Documentation contrast in highlights and (sometimes) deep shadows while maintaining or boosting it in middle tones. You can see it in curves 1 and 3, on the right. For this reason, "Linear response" (where no S-curves is applied on top of the gamma curve) is recommended for SFR measurements. The transfer function may also be adaptive: camera gamma may be higher for low contrast scenes than for contrasty scenes. This can cause headaches with SFR measurements. But it's not a bad idea generally; it's quite similar to the development adjustments (N-1, N, N+1, etc.) in Ansel Adams' zone system. For this reason it's not a bad idea to place a Q-13 or Q-14 chart near the slanted edges. To learn more about gamma, read Tonal quality and dynamic range in digital cameras and Monitor calibration. 2. Capture One LE set to Linear response. Gamma = 0.508. Recommended for SFR runs. 3. Canon FVU set to Standard contrast. Gamma = 0.642. Standardized sharpening If the checkbox is checked, standardized sharpening results are displayed as thick red curves and readouts in the edge and MTF plots. If it is unchecked, standardized sharpening are omitted, which reduces the visual clutter. Results for individual R, G, and B channels are displayed with more prominence (in Imatest Master), and edge noise is displayed. The MTF .CSV summary file is unaffected. Standardized sharpening is an algorithm that allows cameras with different amounts of sharpening to be compared on a reasonable basis. It does so by increasing or decreasing the amount of sharpening to compensate for oversharpened or undersharpened images. Standardized sharpening radius controls the sharpening radius. Its default value of 2 (pixels) is a typical sharpening radius for compact digital cameras, which have tiny pixels. Smaller sharpening radii may be appropriate for digital SLRs, which have larger pixels and tend to have more conservative sharpening. (Imaging-resource.com uses R = 1 for DSLRs.) Sharpening radius varies for different RAW converters and settings. So you may occasionally want to experiment with the sharpening radius. Results with standardized sharpening should not be used for comparing different lenses on the same camera. For more detail, see What is standardized sharpening, and why is it needed for comparing cameras? Standardized sharpening should be unchecked for most applications. If a an edge is too broad for standardized sharpening to work well at the specified radius, the radius is automatically increased unless Fixed sharpening radius in the Settings menu of the Imatest main window has been checked. Channel is normally left at it's default value of Y for the luminance channel, where Y = 0.3*R + 0.59*G + 0.11*B. In rare instances the R, G, and B color channels might be of interest. Picture Width and Height defaults to the width and height of the input image in pixels, assuming landscape format, where height < width. If the input image has been cropped, or if it doesn't represent the entire camera image, Picture Height (and Width) should be entered manually. Line Width per Picture Height (LW/PH) or LP/PH results are correct only if the Picture Height represents the entire uncropped frame. For example, Picture Height should be 2048 for the Canon EOS-10D and 1944 for the Canon G5 (the cameras in the cropped sample files), etc. 133 of 451
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Imatest Documentation Using SFRplus
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