Get information about a remote image by passing a [-format string](http://www.imagemagick.org/script/escape.php) to [ImageMagick's identify command](http://www.imagemagick.org/script/identify.php)

remote_imageinfo_request.js

/**
 * Given an image URL and a format string, return information from ImageMagick's identify command.
 * @param {String} url|uri|image The URL for the image to be analyzed
 * @param {String} [format='{"width": %w, "height": %h}'] String for the the information you want in the format you want. Use variables from http://www.imagemagick.org/script/escape.php
 * @param {String} [callback|cb] Name of the function you want to be called
 * @returns {JSON} {"result": "..."} 
*/
jQuery.getJSON('//imageinfo.jit.su/?cb=?', {
  url: 'http://www.exif.org/samples/olympus-c960.jpg',
  // Your `format` string will typically be much simpler. This expression just
  //   does some work to create a string with every possible variable.
  format: (
    // === PERCENTAGES ===
    '%b%c%d%e%f%g%h%i%k%l%m%n%o%p%q%r%s%t%u%w%x%y%z%A%C%D%G%H%M%O%P%Q%S%T%W%Y%Z%@%#' +
    // === EXTRAS ===
    '%[base]%[channels]%[colorspace]%[copyright]%[depth]%[directory]' + 
    '%[extension]%[group]%[height]%[kurtosis]%[magick]%[max]%[mean]%[min]' + 
    '%[name]%[opaque]%[page]%[resolution.x]%[resolution.y]%[zero]%[scene]' + 
    '%[size]%[skewness]%[standard-deviation]%[type]%[unique]%[version]%[width]%[*]' +
    // === EXIF ===
    '%[EXIF:*]'
  )
  .match(/(%[^%]+)/g)
  .map(function (s) { return "%"+s+":\t"+s; })
  .join('\n')
}, function (r) {
  console.log(r.result);
})

remote_imageinfo_response.txt

%b:	87599B
%c:	
%d:	//www.exif.org/samples
%e:	jpg
%f:	olympus-c960.jpg
%g:	640x480+0+0
%h:	480
%i:	olympus-c960.jpg
%k:	83425
%l:	
%m:	JPEG
%n:	1
%o:	
%p:	0
%q:	16
%r:	DirectClassRGB
%s:	0
%t:	olympus-c960
%u:	
%w:	640
%x:	72 PixelsPerInch
%y:	72 PixelsPerInch
%z:	8
%A:	False
%C:	JPEG
%D:	Undefined
%G:	640x480
%H:	480
%M:	http://www.exif.org/samples/olympus-c960.jpg
%O:	+0+0
%P:	640x480
%Q:	90
%S:	2147483647
%T:	0
%W:	640
%Y:	+0
%Z:	
%@:	640x480+0+0
%#:	f59213cb43c2eac555c72c0530cbe7308f370e3acf33b41cfe02649bdd89c0f6
%[base]:	olympus-c960
%[channels]:	rgb
%[colorspace]:	RGB
%[copyright]:	Copyright (C) 1999-2011 ImageMagick Studio LLC
%[depth]:	8
%[directory]:	//www.exif.org/samples
%[extension]:	jpg
%[group]:	0x0
%[height]:	480
%[kurtosis]:	-0,930479
%[magick]:	JPEG
%[max]:	65535
%[mean]:	29173
%[min]:	0
%[name]:	jpg
%[opaque]:	true
%[page]:	1
%[resolution.x]:	
%[resolution.y]:	
%[zero]:	
%[scene]:	0
%[size]:	87,6KBB
%[skewness]:	0,182894
%[standard-deviation]:	15642,2
%[type]:	
%[unique]:	
%[version]:	ImageMagick 6.7.3-1 2011-11-14 Q16 http://www.imagemagick.org
%[width]:	640
%[*]:	base=olympus-c960
channels=rgb
colorspace=RGB
copyright=Copyright (C) 1999-2011 ImageMagick Studio LLC
date:create=2012-09-17T17:28:40+00:00
date:modify=2012-09-17T17:28:40+00:00
depth=8
directory=//www.exif.org/samples
extension=jpg
group=0x0
height=480
jpeg:colorspace=2
jpeg:sampling-factor=2x2,1x1,1x1
kurtosis=-0,930479
magick=JPEG
max=65535
mean=29173
min=0
name=jpg
opaque=true
page=1
scene=0
signature=f59213cb43c2eac555c72c0530cbe7308f370e3acf33b41cfe02649bdd89c0f6
size=87,6KBB
skewness=0,182894
standard-deviation=15642,2
version=ImageMagick 6.7.3-1 2011-11-14 Q16 http://www.imagemagick.org
width=640

%[EXIF:*]:	exif:ColorSpace=1
exif:ComponentsConfiguration=1, 2, 3, 0
exif:CompressedBitsPerPixel=1/1
exif:Compression=6
exif:DateTime=2000:11:08 20:14:38
exif:DateTimeDigitized=2000:11:07 10:41:43
exif:DateTimeOriginal=2000:11:07 10:41:43
exif:ExifImageLength=960
exif:ExifImageWidth=1280
exif:ExifOffset=274
exif:ExifVersion=48, 50, 49, 48
exif:ExposureBiasValue=0/10
exif:ExposureProgram=2
exif:ExposureTime=1/345
exif:FileSource=3
exif:Flash=0
exif:FlashPixVersion=48, 49, 48, 48
exif:FNumber=80/10
exif:FocalLength=56/10
exif:ImageDescription=OLYMPUS DIGITAL CAMERA         
exif:InteroperabilityIndex=R98
exif:InteroperabilityOffset=958
exif:InteroperabilityVersion=48, 49, 48, 48
exif:ISOSpeedRatings=125
exif:JPEGInterchangeFormat=2012
exif:JPEGInterchangeFormatLength=5145
exif:LightSource=0
exif:Make=OLYMPUS OPTICAL CO.,LTD
exif:MakerNote=79, 76, 89, 77, 80, 0, 1, 0, 8, 0, 1, 2, 3, 0, 1, 0, 0, 0, 2, 0, 0, 0, 2, 2, 3, 0, 1, 0, 0, 0, 0, 0, 0, 0, 3, 2, 3, 0, 1, 0, 0, 0, 0, 0, 0, 0, 4, 2, 5, 0, 1, 0, 0, 0, 124, 3, 0, 0, 5, 2, 5, 0, 1, 0, 0, 0, 132, 3, 0, 0, 6, 2, 8, 0, 6, 0, 0, 0, 140, 3, 0, 0, 7, 2, 2, 0, 5, 0, 0, 0, 152, 3, 0, 0, 9, 2, 7, 0, 32, 0, 0, 0, 158, 3, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 10, 0, 0, 0, 152, 2, 0, 0, 100, 0, 0, 0, 229, 254, 244, 253, 197, 253, 245, 254, 27, 254, 250, 253, 83, 82, 56, 55, 52, 0, 79, 76, 89, 77, 80, 85, 83, 32, 68, 73, 71, 73, 84, 65, 76, 32, 67, 65, 77, 69, 82, 65, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
exif:MaxApertureValue=3/1
exif:MeteringMode=5
exif:Model=C960Z,D460Z
exif:Orientation=1
exif:ResolutionUnit=2
exif:SceneType=1
exif:Software=OLYMPUS CAMEDIA Master
exif:UserComment=0, 0, 0, 0, 0, 0, 0, 0, 0, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32
exif:XResolution=72/1
exif:YCbCrPositioning=2
exif:YResolution=72/1