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Top Forums UNIX for Dummies Questions & Answers Difference between two huge files Post 302235950 by pyaranoid on Saturday 13th of September 2008 11:21:00 PM
Old 09-14-2008
Yes, I know that Bdiff is used for large files.

Do we need to sort the files when we use bdiff?

How to get rid of linenumbers and < and > symbols in front of each record of the outputfile?

Thanks

Sue
 

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pnmpsnr(1)						      General Commands Manual							pnmpsnr(1)

NAME
pnmpsnr - compute the difference between two images (the PSNR) SYNOPSIS
pnmpsnr [pnmfile1] [pnmfile2] DESCRIPTION
Reads two PBM, PGM, or PPM files, or PAM equivalents, as input. Prints the peak signal-to-noise ratio (PSNR) difference between the two images. This metric is typically used in image compression papers to rate the distortion between original and decoded image. If the inputs are PBM or PGM, pnmpsnr prints the PSNR of the luminance only. Otherwise, it prints the separate PSNRs of the luminance, and chrominance (Cb and Cr) components of the colors. The PSNR of a given component is the ratio of the mean square difference of the component for the two images to the maximum mean square difference that can exist betwee any two images. It is expressed as a decibel value. The mean square difference of a component for two images is the mean square difference of the component value, comparing each pixel with the pixel in the same position of the other image. For the purposes of this computation, components are normalized to the scale [0..1]. The maximum mean square difference is identically 1. So the higher the PSNR, the closer the images are. A luminance PSNR of 20 means the mean square difference of the luminances of the pixels is 100 times less than the maximum possible difference, i.e. 0.01. SEE ALSO
pnm(5) 04 March 2001 pnmpsnr(1)
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