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Imatest Documentation Noise detail, Canon EOS-20D, ISO 100, 10-22mm lens, f/8. Here is the same image, displayed in pseudocolor (which shows the amount of variation) with a color bar, and including a histogram (of individual pixels, not the smoothed image used to generate the contour plot on the left). The scale varies from image to image; it is not fixed like the scales for for the luminance and f-stop contour plots (which display long range, low spatial frequency variations). The histogram is narrower than the separate histogram image (above) because long-range (low spatial frequency) density variations have been removed. It is a good approximation to the average sensor noise. Local nonuniformities shown in pseudocolor, Canon EOS-20D, ISO 100, 10-22mm lens, f/8. The same results displayed in 3D are quite impressive. This image can be rotated for enhanced visualization. The circular patterns may originate with reflections between the light source, lens, and sensor. 342 of 451
Imatest Documentation Local nonuniformities shown in 3D shaded pseudocolor, The image below is an enlargement (a zoom) of the above image, centered on the dust spot to the left of the center. You can zoom into an image by using the mouse to draw an rectangle, or by simply clicking on a feature you want to enlarge. You can restore the original image by double-clicking anywhere on the image. The following image is the noise detail from a 2 f-stop underexposed image with maximum luminance = 0.161 (out of 1), f/4.5, ISO 100. It shows a clear pattern. Although it looks alarming, this pattern is invisible because (a) it is in a very dark region, (b) it is aliased. The actual pattern has a much higher spatial frequency, hence is less visible. You need to zoom in to view the true pattern, which is less visible than it appears here. 343 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 MTF50 in Line
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Imatest Documentation Targets Chart
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Imatest Documentation Figures (.PNG
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Imatest Documentation You can enter
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Imatest Documentation Results If RA
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Imatest Documentation Using Colorch
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Imatest Documentation Instructions
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Imatest Documentation Sept. 11, 200
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Imatest Documentation XML Changes N
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