Imatest Documentation

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Imatest Documentation Conversión de ficheros RAW Los archivos RAW son salidas sin procesar desde los sensores de las cámaras digitales. Para un sensor Bayer , cada píxel representa un solo color en una secuencia, RGRGRG, GBGBGB... Para convertirlo en ficheros manejables los ficheros RAW deben ser tratados con un programa de conversión. Estos programas realizan además otro tipo de acciones, añaden la curva de gamma, y muchas veces una mejora en la respuesta tonal, reducen ruido, y enfocan la imagen. Resolución La primero que se debe decir de la resolución es que no tiene una única definición. Se puede expresar de muchas maneras, algunas pueden ser erróneas. En términos generales resolución hace referencia a cualquier medida de un sistema digital que exprese su capacidad de resolver detalles finos. En fotografía convencional, con película, se refiere como “resolución de desvanecimiento” –se mide la mayor frecuencia espacial donde es visible un patrón de una carta de barras (normalmente la carta USAF 1951)-. Este método te dice donde no se ve un detalle, por lo tanto no parece muy buen indicador para percibir el enfoque. El ratio de píxel por pulgada de un escáner es siempre llamado resolución. Esto puede ser muy erróneo. Por ejemplo, escáneres baratos de sobre mesa pueden llegar a tener un poder de resolución –expresado en el ratio de píxeles por pulgada-, tan grande como los escáneres buenos de películas. Un método que parece más eficaz para obtener datos fiables de la resolución real es el que nos aporta el MTF50. 432 of 451
Imatest Documentation Troubleshooting What to do when Imatest doesn't work Version Be sure you have the current version. It may contain fixes for bugs from earlier versions. The version number appears in the bar at the top of the Imatest main window. If it's not the same as the latest version in the Change Log, you should download, install, and run the latest version. Installation To run Imatest in Windows Vista, you'll need version 2.3.3 or later. Update installations do not normally require an uninstall of the previous version, but if you encounter difficulties you may want to uninstall and reinstall Imatest. The Uninstaller is accessable from the Start menu (Start, All programs, Imatest, Uninstall) or from the Add or Remove Programs function of the Control Panel. It gives you the option of keeping or removing the Matlab runtime library archive, Imatest-lib.exe. (Keep is the default; you have to check the box to remove it.) Keeping it speeds up reinstallation. Remove it only if you don't plan to reinstall Imatest or if you have good reason to suspect it may be corrupted (a rare occurrence). Click here for full installation instructions. Problems during installation Installation or registration can fail if You don't have administrator priveleges on your computer. Your computer is behind a strong corporate firewall. This message sometimes appears in systems that have strong firewalls. It can usually be corrected by making sure the Matlab runtime library, Imatest-lib.exe, available from the Download page, is in the same folder as the Imatest installation file. You may need to temporarily disable your firewall and manually download the library file. If you have receive an indication of a "DNS error" (very rare), try clicking Start , Run... Enter ipconfig /flushdns in the Open... box, then click OK . Problems following installation The most common installation problem is a failure of the Matlab runtime library, Imatest-lib.exe, to download or install properly. This results in an error message of the form, "The procedure entry point ... could not be located in the dynamic link library ... .dll." If you get such a message, check to see if file Imatest-lib.exe has been downloaded correctly. Also, check the status of your firewall. Strong firewalls have caused this problem. If it was downloaded automatically (during installation) there should be a copy in the Imatest installation folder (C:\Program files\Imatest in English language installations). If you downloaded it manually (usually required in systems with firewalls), there should be a copy in the same folder as the Imatest installer program, Imatest-x.x.exe. Windows XP Explorer reports its size as 8,513 kB, but the tooltip that appears when you move the cursor over the file name reports its size as 8.31 MB (go figure). If the download failed, a smaller size may be reported. 433 of 451
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Imatest Documentation © 2009 Imate
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Imatest Documentation Using SFRplus
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