4/26/2021 0 Comments Imatest For Mac
The corresponding reference data is available from the same web site as part of the following document: RGB coordinates of the Macbeth ColorChecker (p.5 at the top). After a quick download, we should have both the digital image (1) and the reference data (5) available.Based on analysis of those images, characteristics of cameras, lenses, printers, and scanners can be assessed in a great detail.Imatest consists of several modules that specifically analyze images of standard targets such as GretagMacbeth ColorChecker, Kodak Q-14, IT8, and many more.Imatest runs in compiled Matlab under Windows (2000 - Vista) and on Mac systems under Virtual PC.
It was developed and is being further improved by Norman Koren. There are two versions for photographers - Studio and Master. Imatest Studio has everything that serious photographer needs for testing cameras, lenses, display calibration, printers, print papers, icc profiles and other technical parameters of digital imaging devices. Imatest has its own forum where development, bugs, and usage of Imatest are discussed. This web page will only focuses on examples not described in the manual. These would be examples that I found useful for analysis of LCD displays, printers, scanners and icc profiles. Imatest Manual As ItI definitely recommend reading and printing the Manual as it contains lots of theory and interesting observations. It is a gamut viewer based on the same architecture as its big brother Imatest. It is a powerful tool for learning color management, exploring icc profiles, and proofing color workflows. One can view gamuts of color spaces, displays, scanners, and printer profiles with immediate simulation of gamut mapping and rendering intents. Gamutvision enables preview of printer, paper, and display performance using icc profiles provided either by a manufacturer or profiles generated by yourself. While there is some overlap in modules between Gamutvision and Imatest, the latter does not allow gamut preview and gamut mapping simulation. Gamutvision has also its own forum where development, bugs, and usage are discussed. Similarly to the Imatest, Gamutvision has lots of tutorials and examples worth of reading (go to the bottom of this link ). While using the digital version of the GretagMatbeth ColorChecker, we will compare results obtained from the experimentally measured ColorChecker patches (Imatest-Multicharts) with the theoretical ColorChecker data. There are several types around usually in a form of a tiff file. They differ by Lab or RGB values depending on what version or what source is considered the reference ColorChecker. The most comprehensive description of a wide variety of ColorCheckers is at Danny Pascales web site. Imatest Free From TheFor my measurements I am using the universal Lab version ( free from the BabelColor web site ). This particular version has Lab D50, 2 degree standard observer values encoded and was made available by GretagMacbeth in 2005. The corresponding reference data is available from the same web site as part of the following document: RGB coordinates of the Macbeth ColorChecker (p.5 at the top). After a quick download, we should have both the digital image (1) and the reference data (5) available.
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