![]() ![]() If you open the file in Irfanview, then save it as a PNG or TIFF, it still opens as a monochrome image, but if you save it as a JPEG, it opens as a color image. 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 This page lists the file and device types. Imatest can also acquire files from a large number of devices. Microsoft Word, Writer, IBM Lotus Symphony, Apple Pages, AbiWord.Imatest can read a great many file types, including many not supported by standard Matlab. Most image capture devices (such as digital cameras) that output JPEG are actually creating files in the Exif format, the format that the camera industry has standardized on for metadata interchange.īinary DOC files often contain more text formatting information (as well as scripts and undo information) than some other document file formats like Rich Text Format and HyperText Markup Language, but are usually less widely compatible.Īpple Safari, Google Chrome, Mozilla Firefox, Internet Explorer, Adobe Photoshop, Paint Shop Pro, the GIMP, ImageMagick, IrfanView, Pixel image editor, Paint.NET, Xara Photo & Graphic Designer. Image files that employ JPEG compression are commonly called "JPEG files", and are stored in variants of the JIF image format. In Microsoft Word 2007 and later, the binary file format was replaced as the default format by the Office Open XML format, though Microsoft Word can still produce DOC files. JPEG typically achieves 10:1 compression with little perceptible loss in image quality.ĭOC is a filename extension for word processing documents, most commonly in the proprietary Microsoft Word Binary File Format. The degree of compression can be adjusted, allowing a selectable tradeoff between storage size and image quality. JPEG is a commonly used method of lossy compression for digital images, particularly for those images produced by digital photography. ![]()
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