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Imatest Documentation The Display selection box allows you to select one of the following displays. Pseudocolor color difference. Shows the difference between the ideal and input color patches using any of several metrics. The pseudocolor scale is shown adjacent to the image (below, right). Probe is available for this display. 3D color difference. Split colors: ideal/input. Shows the patches split so that the ideal and input values are displayed in the upper left and the lower right or each patch region, respectively. Probe is available for this display. xy chromaticity. u'v' chromaticity. Black & White density. 3D L*a*b*. Shown on the right. L*a*b* coordinates can be difficult to visualize when viewed from a single angle. It needs to be rotated to be useful. EXIF data and Color matrix. Shows EXIF data if available and the color correction matrix if it has been calculated. The Display area, immediately below the Display selection box, contains display options. The contents, which depend on the display selection, are described below in the sections for the individual displays. Save screen (shown on the right) saves a snapshot of the current display (the entire Multicharts screen) as a PNG file (a widely-used losslessly compressed format). It also allows you to immediately view the snapshot so it can be used a reference for comparing with other results. File name and Directory at the top of the window set the location of the file to save. When you check the Open window in an image viewer... box, the current screen will be opened either the system default viewer (if the box under Image viewer is blank) or a viewer/editor of your choice (if the box contains the path name to the viewer/editor). I recommend using Irfanview, which is fast, compact, free, and supports an amazing number of image file formats. Its normal location in English language installations is C:\Program Files\IrfanView\i_view32.exe. Save data Saves the key data in CSV and XML formats. This includes the input R, G, and B values, the input and reference L*, a*, b* values, and several of the color difference metrics. Help opens this web page in an HTML browser window. Exit terminates Imatest Multicharts, but the Imatest main window is still available. Displays and options Pseudocolor Color difference Shows the difference between the ideal and input color patches using any of several metrics using a pseudocolor color map. If a color correction matrix has been calculated, the difference between the ideal and corrected patches are shown at the bottom. The pseudocolor scale is shown adjacent to the image. Probe (Checkbox; Pseudocolor and Split views) turns on the probe, illustrated below. When the probe is on, you can probe any patch in either image. The probe data (for the individual patch), shown below the split display, includes an image of the ideal and input patch colors, ideal and input RGB and L*a*b* values, and several ∆E* and ∆C* color difference metrics. (Corrected colors are used if a color correction matrix has been calculated and Display corrected has been selected.) ∆E*ab, the geometric distance in L*a*b* space, is the most familiar, but ∆E*94, which is lower for chroma differences in highly chromatic colors (with large a* 2 312 of 451
Imatest Documentation + b* Pseudocolor display for IT8.7 2 ), may be a better measure of visual color difference. It's easy to correlate ∆E* metrics with visual color differences using this display. None of the metrics are perfect! The probe is turned off by clicking outside either of the images. Split display for IT8.7 illustrating Probe Color difference type (Popup menu to the right of the Probe checkbox; also in 3D Color difference) Contains a list of color metrics (mostly difference metrics) including ∆E*ab, ∆C*ab, ∆E*94, ∆C*94, ∆E00, ∆C00 (CIEDE2000 metrics that replaced ∆E*CMC and ∆C*CMC in Imatest 2.6.8), ∆L*, ∆Chroma, ∆|Hue distance| , ∆(Hue angle) , Chroma (input) and Chroma (output). Invert (Checkbox) inverts the color map. For the map shown (above, right), 0 would be black; maximum would be white. Color map (Popup menu) allows you to select the color map. The WYRMBK color map shown goes from White - Yellow - Red - Magenta - Blue - Black. 3D Color difference Uses the height of the patches to display the difference between the ideal and input colors. Any of several metrics can be chosen. Can be zoomed and rotated. Light (Checkbox) Turns on light to highlight the shape of the plot. Default is On. A-rotate (Toggle button; short for Auto rotate) starts rotating the image. Rotation is quite slow; it may be less useful than the 3D L*a*b* plot (below). The image continues to rotate until the next time you press the A-rotate button. It's best to turn off rotation before switching to other views. Color difference type (Popup menu) Described above under Pseudocolor display. Background (Slider) sets the background gray level. Invert (Checkbox) inverts the up-down orientation of the 3D plot. 3D Color difference display for IT8.7 313 of 451
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Imatest Documentation © 2009 Imate
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Imatest Documentation Using SFRplus
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