nixCraft

TiredOrangeCat · #1 (**permalink**) 10-02-2007, 04:07 AM

Is there a script or command(s) that will allow me to view the following information,

Image Size
Image Resolution
Image Compression

If its a simple command cool, if its a script can you please explain whats what and whys where.

nixcraft · #2 (**permalink**) 10-02-2007, 01:55 PM

Welcome to nixCraft forum!

You can try identify command:

Code:

identify 2009.jpg

Output:
2009.jpg JPEG 1024x768 DirectClass 91kb 0.000u 0:01

For more info pass -verbose option to command:

Code:

identify -verbose networking.jpg

Output:

Code:

Format: JPEG (Joint Photographic Experts Group JFIF format)
  Geometry: 488x281
  Class: DirectClass
  Colorspace: RGB
  Type: TrueColor
  Depth: 8 bits
  Endianess: Undefined
  Channel depth:
    Red: 8-bits
    Green: 8-bits
    Blue: 8-bits
  Channel statistics:
    Red:
      Min: 0
      Max: 255
      Mean: 221.43
      Standard deviation: 69.9033
    Green:
      Min: 0
      Max: 255
      Mean: 228.501
      Standard deviation: 55.7455
    Blue:
      Min: 0
      Max: 255
      Mean: 238.427
      Standard deviation: 41.9074
  Colors: 24088
  Rendering-intent: Undefined
  Resolution: 72x72
  Units: Undefined
  Filesize: 22kb
  Interlace: None
  Background Color: grey100
  Border Color: #DFDFDF
  Matte Color: grey74
  Dispose: Undefined
  Iterations: 0
  Compression: JPEG
  Orientation: Undefined
  JPEG-Quality: 75
  JPEG-Colorspace: 2
  JPEG-Sampling-factors: 2x2,1x1,1x1
  signature: e50adabb6c5f76a4aa0caf8e28dbecf19bd46a19ecd230007387a6cc3a744038
  Tainted: False
  User Time: 0.010u
  Elapsed Time: 0:01

Here is a script:

Code:

#!/bin/bash
function die(){
 echo $@
 exit 1
}

# fallback
[ $# -eq 0 ] && die "Syntax: $0 image-file-name" || file=$1
IDEN=$(which identify)
[ $? -eq 1 ] && die "Command identify not found. Install imagemagick package" || :

# get data
size=$($IDEN -verbose $file | grep size | awk '{ print $2}')
resolution=$($IDEN -verbose $file | grep Resolution | awk '{ print $2}')
compression=$($IDEN -verbose $file | grep Compression | awk '{ print $2}' )

# display back
echo "Image name - $file"
echo "Image size - $size"
echo "Image resolution - $resolution"
echo "Image compression - $compression"

Read man page of identify command for more info and make sure package imagemagick is installed

TiredOrangeCat · #3 (**permalink**) 12-02-2007, 12:04 AM

Thanks, thats just what I was lookin for. Now if I were to need to run this through an entire diecrtory of files would I need to toss it into a loop? I came up with something similar yesrturday while experimenting myself but I was having trouble printing the file name.

identify -verbose *.*|awk '/Geometry/{print($2)}'|awk -Fx '{print("*.* : "($1"x"$2))}'> /home/Main/resolution.txt
sort -n /home/Main/resolution.txt > /home/Main/sortres.txt
grep 835 /home/Main/sortres.txt > /home/Main/finalsort.txt

Ignore the redundancy its a nessceary evil. I used *.* to catch all the files inside the diectory but found I cannot print what the current file is. Is there another way I can catch all files and print the name of the appropriate file with its res?

nixcraft · #4 (**permalink**) 12-02-2007, 10:27 PM

I am not sure what you are doing but correct way to read file one by one is using for loop

Code:

for f in /path/to/*
do
   echo $f
done

$f holds each file name and

Code:

for f in /path/to/*
do
identify -verbose $f |awk '/Geometry/{print($2)}'|awk -Fx '{print("*.* : "($1"x"$2))}'>> /home/Main/resolution.txt 
done

HTH

TiredOrangeCat · #5 (**permalink**) 12-02-2007, 11:04 PM

Im pretty new to this UNIX programming stuff and was just setting up a few scripts for myself, to see if I could create a few utilities to retrieve specific information from images. Thanks. Mostly right now its kinda like smashing two rocks together for me

I get the code out there but its far from sophisticated or stable. lol, oh well back to the drawing board. I really appreciate the help.

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Script to Display Image size, Res, and Compression

Script to Display Image size, Res, and Compression

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