Imatest, which uses Matlab libraries, opens it as a monochrome image. This image displays correctly in Windows Explorer (with Icon view), but when you right-click on the image, select Properties, then click on the Details tab, it shows Bit depth = 8, which indicates a monochrome image (it would be 24 or 48 for color). You can download this image (on the right) by clicking or right-clicking on it. Image files are either color or monochrome, but we recently found a file that was color, but appeared to be Monochrome in the Windows Properties display and when opened by Imatest. This usually works well, but the case below is a rare exception. In such cases you can use Irfanview to “launder” the image file by saving it (typically with a slightly different name to indicate that it’s not the original file). “Laundering” defective files Sometimes a file can’t be read by Imatest(which depends on Matlab libraries), but can be read by Irfanview, which evidently has more robust read routines. It will give you a message explaining the issue and suggesting an action (typically renaming the file with the correct extension). If you have trouble reading a file, we recommend opening it in Irfanview (a great free utility strongly recommended). Sometimes a file has an incorrect extension (for example, a PNG file might have a JPG extension). Most file types are recognized by their extensions, which are case-insensitive. Video files – Raw files: Commercial – Generalized Read Raw – DNG – Acquisition devicesĭefective image files Incorrect file extension Standard (interchangeable) image files – HDR – EXR – Special TIFF formats – YUV – TGA – DPX – CSV – HEIC This page lists the file and device types. Imatest can also acquire files from a large number of devices. Imatest can read a great many file types, including many not supported by standard Matlab.
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