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Imatest Documentation Using Multicharts Interactive analysis of several test charts Introduction Colorchecker IT8.7 CMP DT 003 Colorchecker SG QPcard 201 Q-13 ChromaDuMonde 28/28R Getting started Imatest Multicharts analyzes images of several test charts for color accuracy, tonal response, and ISO sensitivity using a highly interactive user interface. It can be used to measure white balance and color response for a wide range of lighting conditions and scenes. It can also display the tonal response of monochrome charts (or monochrome portions of color charts). A color correction matrix can be calculated (Imatest Master only). Several of the supported test charts are shown on the left. The 140-patch ColorChecker SG, ChromaDuMonde, linear grayscale stepcharts, and several additional Special Charts are supported by Imatest Master only. Photograph or scan the chart, taking care to avoid glare, which can be problematic in charts with semigloss (SG) and glossy surfaces such as the IT8.7 and ColorChecker SG. Glare can be especially difficult to control with wide angle lenses. A recommended lighting setup is described here. For testing white balance, you can photograph the chart in a scene under a variety of lighting conditions. The mini ColorChecker is especially suitable for this purpose. Rectangular charts may be rotated by multiples of ±90° if they are geometrically symmetrical (these include the two ColorCheckers, the CMP DT003, QPCard 01, and the Kodak Q-13/Q-14, but not the IT8.7 (where top and bottom are different). To start Multicharts, run Imatest, then click the Multicharts button. The Multicharts window will appear with brief instructions, which may be more up-to-date than the ones shown below. 306 of 451
Imatest Documentation Multicharts opening window with brief instructions Select a chart to analyze by clicking on one of the entries in the popup menu below Chart type or by clicking on Read image file if the correct Chart type is displayed. The Read image file button and popup menu (shown on the right) are highlighted (yellow background) when Multicharts starts. Multicharts supports the following charts: Select a chart to read. The standard 24-patch X-Rite ColorChecker ® . ColorChecker charts (standard and SG) are available from a great many suppliers, including ColorHQ, Adorama, ColorManaged.com, and X-Rite. The industry-standard IT8.7 chart. IT8.7 charts come in several formats (reflective and transmissive), available from Wolf Faust (in the USA from Digital Light & Color), Fuji, and others. Reflective IT8.7/2 charts are relatively inexpensive. IT8.7 charts are printed on photographic paper or film (consisting of three dye layers). They must be used with reference files. Here are a few sources: Monaco IT8 reference files | Kodak Q60 targets (FTP site) | Wolf Faust (Coloraid.de) IT8.7 (Kodak Q-60) test images can be found in Imaging-Resource.com test reports. Look for the Samples page in the review for the camera of interest, then click on Multi Target. Example: Sigma DP1 | Sigma DP1 Test Image. The reference file for IR's target (Kodak Q-60R1 2006:06) is in this file on the Kodak Q60 targets FTP site. The 285-patch CMP (Christophe Metairie Photographie) DigitaL TargeT 003 (CMP DT003), which comes with an individually calibrated reference file containing XYZ and L*a*b* data. It can be used to generate extremely precise camera profiles. The inexpensive 30-patch QPcard 201, which can be used with free downloadable QPcolorsoft 501 software for profiling cameras. Designed by Lars Kjellberg, founder of the outstanding lens test site, Photodo.com, which uses Imatest. The QPcard should be photographed in landscape mode with the Qpcard logo on the right. 307 of 451
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Imatest Documentation © 2009 Imate
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Imatest Documentation Using SFRplus
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