02-11-2019
To make this clear, UNIX/Linux are not FreeWindowsWithLessBugs(tm). If you look at the ways they differ from Windows and think, "I can use that feature to solve problems," then maybe Linux is for you.
The difference is as much in philosophy as anything. Windows provides the bare minimum of features and expects you to buy upgrades and proprietary programs to make up the difference. Linux has most features available by default, more robustly and with more options, with a less polished interface,
Creating disk images in Windows: Feature removed in 199x when it stopped being DOS, so dish out the moolah for a proprietary implementation.
Creating disk images in UNIX: Disks are literally files, so any command-line utility capable of reading files can deal with disks. Nonetheless there's a variety of tools. It's a bad idea to use them while the partition's being written to, but we can't stop you.
Burning CDROM images in Windows: We added this feature 20 years too late and nobody cares any more.
Burning CDROM images in UNIX: A flagship feature since 1996.
etc.
GUI-wise, Linux/Unix seem to be trying hard to imitate Windows these days. But the GUI is only skin-deep, not deeply integrated.
Last edited by Corona688; 02-11-2019 at 12:06 PM..
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LEARN ABOUT REDHAT
pnmpsnr
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)