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Block Sum Filter The Block Sum Filter sums blocks of pixels into super pixels to increase the numeric pixel capacity and signal to noise ratio in return for reducing the spatial resolution. This is similar to binning a digital sensor at the time of image acquisition except that a binned sensor includes 1 unit of readout noise per super pixel whereas block summing or averaging combines the readout noise of all pixels in the block. Usually, the combined readout noise is not a significant issue with modern low-noise sensors. Also see the related Block Average Filter. This command updates several headers keywords that may be present. See Pixel Scale Sensitive FITS Keywords.
Block Sum Filter Properties
Promoting the Pixel TypeBlock summing combines the pixel values in each m x n block. For integer type pixels, this can result in overflowing the maximum number represented by the pixel type. For example, an unsigned 16-bit image has a maximum pixel value of 65535; hence a group of pixels with values near 40,000 would overflow when combined even as a 2x1 super-pixel. The Promote Pixel Type check box is provided to automatically increase the numeric capacity by switching to a larger pixel type such as 32-bit floating point. Related Topics
Mira Pro x64 8.83 User's Guide, Copyright Ⓒ 2026 Mirametrics, Inc.
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