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Imatest Documentation Help Online Help opens this page in your default web browser. Generalized Read Raw RAW files created by engineering development systems are rarely supported by dcraw. In many such cases you can read them (even if they're not standard image files) using the Read RAW capability released in Imatest 3.5.2. This new capability allows you to measure MTF of undemosaiced files (interpreted as standard monochrome files) when White Balance (WB) is applied. To read generalized RAW files you must specify a file extension (up to five can be registered) and associate read parameters with that extension. This can be done in the following steps. Click Settings, Read Raw setup. The following dialog box opens. Note that it's labeled Beta. Its capabilities will be enhanced through 2010. Entries should be based on manufacturer's data sheets, but some trial-and-error is usually required. If you make an incorrect choice, two plots will be displayed (below) to help determine the correct values. Read Raw setup dialog box File extension. Select the extension index (1 through 5) with the dropdown menu on the left. (This number just selects which of the five extensions to work with.) Enter the extension (3 or more alphanumeric characters) in the box on the right. If possible, it should not be one of the extensions recognized by dcraw. The settings for this extension will be saved when you click OK or Test (which tests them by reading and displaying a file). As of October 2009, the following extensions (listed in www.cybercom.net/~dcoffin/dcraw/rawphoto.c) are recognized by dcraw: 3fr, arw, bay, bmq, cine, cr2, crw, cs1, dc2, dcr, dng, erf, fff, hdr, ia, jpg, k25, kc2, kdc, mdc, mef, mos, mrw, nef, nrw, orf, pef, pxn, qtk, raf, raw, rdc, rw2, sr2, srf, sti, tif, and x3f. Input pixel size How pixels are stored in the file. Choices are uint8, uint16, and uint32 (unsigned 8, 16, and 32-bit formats). In the future other formats may be added (more complex to implement), for example, for 2 12-bit pixels stored in 3 bytes. Output pixel size How pixels are stored in Imatest. Choices are uint8 or uint16. Bit shift The amount to shift bits: Auto or 0, ±2, ±4, ±6, or ±8. Usually needed to get correct levels for analysis. Negative numbers lighten the image. Byte ordering IEEE Little or Big-Endian. See wikipedia.org/wiki/Endian. Width Image width in pixels. Can usually be obtained from manufacturer's data sheets. If you enter an incorrect number for width and height (if Width x Height &un, two additional plots are displayed (see below) that help estimate the width. Height Image height in pixels. Transpose Switches rows and columns. Usually checked. Pixels to skip The number of pixels to skip at the start and end of the file. White balance None or Simple White Balance (gray world). Simple WB sets the gain on the four channels so their mean is 100 of 451
Imatest Documentation identical (the lowest of the four means). It's not a sophisticated algorithm— it only works for mostly gray test charts (some color is tolerated as long as it averages to near-neutral gray). WB allows you to interpret the image as a standard monochrome file (rather than a Bayer RAW channel with only 1/4 the pixels) that can be analyzed for MTF with any of the sharpness modules (SFR, SFRplus, Log F-Contrast, Star Chart). A slanted edge without and with WB is shown below. White balance was not far off to begin with in this case. SFR edges: without and with White Balance White level No change or Auto: 99% of saturation. The Auto: 99% setting sets the highest pixel to 99% of the saturation level (252 for 8-bit files; 64880 for 16-bit files). This usually lightens the images, especially if Bit shift is not set to the optimum value. Help Opens this web page. Output file Save the file (currently Bayer RAW-only) None (do not save; read-only), PNG file, or JPEG file. Files saved as PNG or JPG can be opened with Rawview. Test Saves the settings, then reads and displays a raw image file (example on right). If the actual size of the file read is not equal to the Pixel Width x Height, the image will be displayed with the same Width and an adjusted height and two diagnostic images (shown below; for estimating the correct width) are displayed. The text below the plot displays the specified Width, Height, and W x H and the actual number of pixels returned (which will equal W x H if the correct values have been chosen). OK Saves the settings and closes the Read Raw setup window. Cancel Closes the window. Does not save the settings. Estimating image width and height If the number of pixels read, excluding the skipped pixels at the beginning or end of the file, is not equal to the specified (Width x Height), two diagnostic plots are produced and the periodicity (normally equal to the pixel width) is estimated. The image on the right is what we get if we enter a deliberately incorrect value for Width (2590 instead of 2592). It's only a little off. Most of the time the resulting image is unintelligible. The first added plot shows the levels of 2 15 = 32768 pixels near the middle of the file. It gives a good idea of the periodicity, but it's very difficult to read the exact number from this plot. 101 of 451
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Imatest Documentation © 2009 Imate
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Imatest Documentation Using SFRplus
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Imatest Documentation Image Quality
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