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Imatest Documentation asked to make an ROI selection. It's OK to make a rough selection: another window will enable you to refine it. After you've made the rough selection, the Stepchart input dialog box, shown below, appears. To measure veiling glare, Automatic Zone detection must be unchecked, Veiling glare must be checked, and the number of patches must be set to one greater than the number of patches in the step chart: 21 in this case. Stepchart input dialog box, set for veiling glare Click OK . The fine adjustment box appears. Press Lighten , just to the right of Zoom out to view the dark patches clearly. The Lighten button changes to Normal when the image is in lightened mode. It also helps to maximize the window and click the Coarse radio button (middle, left). Portion of Fine ROI adjustment window; Lightened view ( Normal box is displayed) Click Yes, Continue to run Stepchart and calculate veiling glare. Results The first illustration shows the results for the Canon EOS-20D with the 24-70mm f/2.8L lens set at 70mm, f/8. Veiling glare is shown on the middle-right of the first figure. 44 of 451
Imatest Documentation with UV filter (not multicoated) No filter: 23% lower veiling glare Overexposed about 2 f-stops, with UV filter: Results are insensitive to overexposure. These plots show the difference in linearity between JPEG and RAW (to TIFF) density response. The EOS-20D only deviates slightly from linearity (a straight gamma curve). JPEG density response, showing nonlinearity in highlights Lens Elements Groups Focal length Canon 24-70mm f/2.8L USM (no hood; single-coated UV filter) RAW/TIFF density response, showing good linearity in highlights Table of results: Canon EOS-20D JPEG data 16 13 70 8 f-stop Veiling glare 0.453% '' (no filter) 0.348% Comments A premium zoom, known for excellent sharpness. Results are strongly affected by the single-coated UV filter, but they are insensitive to overexposure. When working from RAW (CR2) images, veiling glare was 0.564% with the filter and 0.391% with without it. Different results; similar trends. 45 of 451
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