INFINITY ANALYZE User's Manual - Spectra Services

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Lumenera INFINITY ANALYZE User’s Manual Release 6.0.0 Histogram A histogram is a graphic representation of the number of pixels at each brightness level in an image. INFINITY ANALYZE plots histograms for all three channels of the active image based on RGB color model. In the black square box, the x axis represents the color value from darkest (0) at the far left to brightest (255) at the far right; the y axis represents the frequency, i.e. the total number of pixels with that value; the origin of the histogram is the bottom left corner of the black box. Note that histograms of red, green and blue channels are shown in the same coordination system as red, green and blue bars and so they may overlap. The following table helps to tell the overlapping range of the histograms. Red and Green Red and Blue Green and Blue Red and Green and Blue The histogram can be shown for both still and live images. For a still image, its histogram is updated whenever the image itself is being modified in any way, including the way it is being displayed. For a live image, its histogram is updated every three seconds. In both cases, the histogram is only for the part of the active image that is visible on computer screen. Page 22 Copyright © 2006-2011
Release 6.0.0 Lumenera INFINITY ANALYZE User’s Manual Look-Up Table The title bar of the histogram pane includes icons used to access Look-up Table (LUT) functions. When enabled the LUT is applied to the live preview window providing instant feedback based on the Red, Green, and Blue channel manipulations. Each channel can be modified individually, or all three channels can be set to be the same. The LUT can be enabled or disabled as desired. Use the File menu to access the option that applies the active LUT to a captured image. The horizontal axis of the histogram represents the image input intensity values from minimum (0) on the left, up to maximum (255) on the right. The vertical axis represents the corresponding output intensity value from minimum (0) at the base, up to maximum (255) at the top. The line displayed across the histogram represents the point at which an input intensity value is transitioned to the corresponding output intensity value. Therefore, a line sloping upwards from the bottom left corner to the top right corner represents a neutral LUT definition, where each input value maps to the identical output value. An inverse look-up table is shown by a line sloping down from the upper left corner to the bottom right corner, resulting in all minimum input values being transitioned to maximum output values (and vice versa), such that the channel becomes a negative representation of the original. Copyright © 2006-2011 Page 23
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INFINITY ANALYZE User's Manual - Spectra Services

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