Hello,
I have ImageMagick on my MacOSX development machine and I have it
also installed on a linux server
When I run identify to get the resolution on the same picture on the
two machines it gives me different results.
mac:
fluse:~ cf$ identify -version
Version: ImageMagick 6.3.6 10/12/07 Q16 http://www.imagemagick.org
Copyright: Copyright (C) 1999-2007 ImageMagick Studio LLC
fluse:~ cf$ identify -format %x -units PixelsPerInch 9783867420013.jpg
300 PixelsPerInch
linux:
(13:00:06) [~] identify -version
Version: ImageMagick 6.3.5 10/25/07 Q16 http://www.imagemagick.org
Copyright: Copyright (C) 1999-2007 ImageMagick Studio LLC
(13:06:07) [~] identify -format %x -units PixelsPerInch
9783867420013.jpg
72 PixelsPerInch
The picture files are identical. I copied the file via scp from mac
to linux. They have the same size in bytes on both machines. When I
copy it back from linux to mac and run identify again, I get 300 dpi
again. Photoshop on the mac shows my 300dpi for the picture as well.
anyone know why this results in different resolution values?
Regards
christoph
PS: I attach the results of identify -verbose below
mac:
fluse:~ cf$ identify -verbose 9783867420013.jpg
Image: 9783867420013.jpg
Format: JPEG (Joint Photographic Experts Group JFIF format)
Class: DirectClass
Geometry: 827x744+0+0
Type: TrueColor
Endianess: Undefined
Colorspace: RGB
Depth: 8-bit
Channel depth:
Red: 8-bit
Green: 8-bit
Blue: 8-bit
Channel statistics:
Red:
Min: 0 (0)
Max: 255 (1)
Mean: 143.545 (0.562921)
Standard deviation: 71.4095 (0.280037)
Green:
Min: 0 (0)
Max: 255 (1)
Mean: 151.912 (0.595733)
Standard deviation: 63.1374 (0.247598)
Blue:
Min: 0 (0)
Max: 255 (1)
Mean: 135.421 (0.531061)
Standard deviation: 64.5181 (0.253012)
Rendering intent: Undefined
Resolution: 300x300
Units: undefined
Filesize: 413.441kb
Interlace: JPEG
Background color: white
Border color: rgb(223,223,223)
Matte color: grey74
Transparent color: black
Page geometry: 827x744+0+0
Dispose: Undefined
Iterations: 0
Compression: JPEG
Quality: 99
Orientation: TopLeft
Exif:ColorSpace: 65535
Exif:Compression: 6
Exif:DateTime: 2007:12:14 13:39:55
Exif:ExifImageLength: 744
Exif:ExifImageWidth: 827
Exif:ExifOffset: 164
Exif:JPEGInterchangeFormat: 302
Exif:JPEGInterchangeFormatLength: 8471
Exif:Orientation: 1
Exif:ResolutionUnit: 2
Exif:Software: Adobe Photoshop CS2 Macintosh
Exif:XResolution: 3000000/10000
EXIF:YResolution: 3000000/10000
Jpeg:colorspace: 2
Jpeg:sampling-factor: 1x1,1x1,1x1
Rdf:about:
Signature:
2e510aea825936cae9c81498ccd3be9acc70dfc934a3e190b5fc27078dcd3497
Xmlns:xap: http://ns.adobe.com/xap/1.0/
Profile-8bim: 19240 bytes
Profile-exif: 8779 bytes
Profile-xmp: 15036 bytes
Tainted: False
Version: ImageMagick 6.3.6 10/12/07 Q16 http://www.imagemagick.org
linux:
--------------------------
(13:06:55) [~] identify -format %x -units PixelsPerInch
9783867420013.jpg
72 PixelsPerInch
(13:25:41) [~] identify -verbose 9783867420013.jpg
Image: 9783867420013.jpg
Format: JPEG (Joint Photographic Experts Group JFIF format)
Class: DirectClass
Geometry: 827x744+0+0
Type: TrueColor
Endianess: Undefined
Colorspace: RGB
Depth: 8-bit
Channel depth:
Red: 8-bit
Green: 8-bit
Blue: 8-bit
Channel statistics:
Red:
Min: 0 (0)
Max: 255 (1)
Mean: 143.545 (0.562921)
Standard deviation: 71.4095 (0.280037)
Green:
Min: 0 (0)
Max: 255 (1)
Mean: 151.912 (0.595733)
Standard deviation: 63.1374 (0.247598)
Blue:
Min: 0 (0)
Max: 255 (1)
Mean: 135.421 (0.531061)
Standard deviation: 64.5181 (0.253012)
Rendering intent: Undefined
Resolution: 72x72
Units: undefined
Filesize: 413.441kb
Interlace: JPEG
Background color: white
Border color: rgb(223,223,223)
Matte color: grey74
Transparent color: black
Page geometry: 827x744+0+0
Dispose: Undefined
Iterations: 0
Compression: Bumpmap
Quality: 99
Orientation: TopLeft
Exif:ColorSpace: 65535
Exif:Compression: 6
Exif:DateTime: 2007:12:14 13:39:55
Exif:ExifImageLength: 744
Exif:ExifImageWidth: 827
Exif:ExifOffset: 164
Exif:JPEGInterchangeFormat: 302
Exif:JPEGInterchangeFormatLength: 8471
Exif:Orientation: 1
Exif:ResolutionUnit: 2
Exif:Software: Adobe Photoshop CS2 Macintosh
Exif:XResolution: 72/1
Exif:YResolution: 72/1
Jpeg:colorspace: 2
Jpeg:sampling-factor: 1x1,1x1,1x1
Rdf:about:
Signature:
307336d3329ba618372e04e84db9e07cd2120b92f43f59ec4d5f4bb1b5c7bdf2
Xmlns:xap: http://ns.adobe.com/xap/1.0/
Profile-8bim: 19240 bytes
Profile-exif: 8779 bytes
Profile-xmp: 15036 bytes
Tainted: False
Version: ImageMagick 6.3.5 10/25/07 Q16 http://www.imagemagick.org
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