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Imatest Documentation Important results below are shown in Bold. The most important is MTF50, without and with Standardized sharpening. Its relationship with print quality is discussed in Interpretation of MTF50. The contents of the plots are affected by whether or not Standardized sharpening is checked in Settings section of the SFR input dialog box. Differences in plot content are indicated by [Std Sharpening checked] or [Std Sharpening off]. Edge response Upper left: Spatial domain plot Black line (bold) Red line (dashed, bold) R, G, B dashed lines (thin) Left column text (input settings) Edge profile for the luminance (Y) channel, where Y = 0.3*R + 0.59*G + 0.11*B. Original (without standardized sharpening). The edge profile shown on the right is proportional to the light intensity. You may also select to display the Line Spread Function (LSF; the derivative of the edge profile), shown on the right, below, or Pixel levels (which includes gamma-encoding). Edge profile for the luminance (Y) channel with standardized sharpening, indicated by (corr) for "corrected." Radius R used for setting standardized sharpening is displayed. Defaults to 2, but may set manually; may be larger for unusually broad transitions (poor MTF response). [Std Sharpening checked] Edge profile [Standardized sharpening on] Individual edge profiles for R, G, and B channels. Shown more prominently in the Chromatic Aberration plot, below. Barely visible in this illustration because this camera has very little chromatic aberration. Imatest Master only. Title, including measurement orientation. (A vertical edge is used for a horizontal profile.) Image height (H) or Width x Height (WxH) in pixels Total megapixels Channel. Defaults to Y (luminance). R, G, or B are also available. Gamma is an estimate of camera gamma used to linearize the image. Defaults to 0.5. Region of interest (ROI) size in pixels ROI location in percentage of distance from center to corner. 144 of 451
Imatest Documentation Right column text (results) [not for LSF] 10-90% rise distance (original; uncorrected) in pixels and rises per picture height (PH). [not for LSF] 10-90% rise distance (with standardized sharpening; indicated by (corr) for "corrected") in pixels and rises per PH. Radius R used for setting standardized sharpening is displayed. Defaults to 2, but may set manually; may be larger for unusually broad transitions (poor MTF response). Includes the equivalent "ideal megapixels" in brackets [...]. [Std Sharpening checked; not for LSF] [not for LSF; Imatest Master only] 10-90% rise distances of the R, G, and B channels, individually. Imatest Master only. Line spread function [Std Sharpening off] [LSF only] Peak LSF (maximum d(Edge)/dx) and PW50 (50% pulse width) in pixels and pulse widths per picture height (PH). RMS edge roughness in pixels. A promising measurement related to image quality. Shown on the right. [Std Sharpening off] Overshoot and undershoot. Percentage of step amplitude. Shown if appropriate. [Std Sharpening checked] Average pixel levels in dark and light areas, and light/dark ratio. Clipping can occur if they are too close to 0 or 255. Also gives the ratio between the light and dark areas: an indication of the contrast of the image. 145 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 tilted (about
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Imatest Documentation MTF50 in Line
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Imatest Documentation SQF Subjectiv
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Imatest Documentation RAW converter
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Imatest Documentation cm (4 inch) h
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Imatest Documentation CSF( f ) = 2.
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Imatest Documentation correlate wit
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Imatest Documentation Unlike the ab
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Imatest Documentation Since luminan
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Imatest Documentation committee" (I
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Imatest Documentation The formula f
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Imatest Documentation The image to
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Imatest Documentation Sharpness com
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Imatest Documentation (DPR) Canon E
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Imatest Documentation but their noi
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Imatest Documentation The average t
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Imatest Documentation Chromatic abe
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Imatest Documentation Veiling glare
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Imatest Documentation A Kodak Q-13
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Imatest Documentation with UV filte
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Imatest Documentation Czajkowski' r
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Imatest Documentation P_Rm = O_Rm*A
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Imatest Documentation Split view, s
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Imatest Documentation Target size C
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Imatest Documentation Kodak Q-14 St
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Imatest Documentation Imatest Instr
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Imatest Documentation in the Imates
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Imatest Documentation samples (fold
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Imatest Documentation Using Imatest
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Imatest Documentation About RAW fil
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Imatest Documentation Options I for
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Imatest Documentation Special user
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Imatest Documentation MTF Compare C
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Imatest Documentation MTF Compare r
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Imatest Documentation Rescharts SFR
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Imatest Documentation Running Batch
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Imatest Documentation SFRplus setup
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Imatest Documentation Additional pa
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Imatest Documentation Output files
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Imatest Documentation Lens-style MT
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Imatest Documentation File formats
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Imatest Documentation SFR input dia
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Imatest Documentation Figures (.PNG
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Imatest Documentation Chromatic Abe
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Imatest Documentation You can enter
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Imatest Documentation Results If RA
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Imatest Documentation Dynamic range
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Imatest Documentation Set exposure
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Imatest Documentation MTF (sharpnes
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Imatest Documentation Intersection
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Imatest Documentation Preview image
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Imatest Documentation Black level (
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Imatest Documentation Reset pattern
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Imatest Documentation SVG Test Char
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Imatest Documentation SVG SFR chart
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Imatest Documentation To run Test C
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Imatest Documentation Invert light/
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Imatest Documentation files. Quick
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Imatest Documentation File selectio
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Imatest Documentation cyclesper_val
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Imatest Documentation S=1 HSL Hue p
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Imatest Documentation Instructions
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Imatest Documentation 7. 8. Mask im
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Imatest Documentation 9. Corr Image
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Imatest Documentation Appendix Cros
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Imatest Documentation Sorted by tes
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Imatest Documentation Jan. 6, 2007
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Imatest Documentation Sept. 11, 200
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Imatest Documentation XML Changes N
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Imatest Documentation License The I
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Imatest Documentation 11. GENERAL T
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