difference between oracle glassfish and glassfish opensource
questions.
What's basically the difference between if I use the opensource and oracle glassfish (the one that requires license for production use)? Is there an evaluation period for the latter? Pls advise
I tried to install glassfish on Solaris 10 and it worked fine on other instances. I got the below message
bash-3.00# ./sjsas-9_1_01-solaris-sparc.bin -console
bash: ./sjsas-9_1_01-solaris-sparc.bin: Invalid argument
I logged on as root and the file has execute permission. So strange. Do... (1 Reply)
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)
