Legacy ImageMagick Discussions Archive

I'm having some problems with the resolution of some images when mounting them in InDesign.

What I try to do is convert a large image to a smaller one with size max 700x700 pixels and set to 72DPI.

The original image have the following properties:

Code: Select all

  Geometry: 7323x5315
...
  Resolution: 300x300
  Units: PixelsPerInch
...
    X Resolution: 3000000/10000
    Y Resolution: 3000000/10000

I run the following command to convert the original image

Code: Select all

convert GT6030.1.jpg -filter Lanczos -resize 700x700 -quality 85 -density 72x72 GT6030_out.jpg

When checking the output image with

Code: Select all

identify -verbose |grep Resolution

I get some different output depending on ImageMagick version (all versions compiled with exact same options on the same machine and installed in separate directories).

6.2.9-8 and 6.3.0-7 :

Code: Select all

  Resolution: 300x300
    X Resolution: 3000000/10000
    Y Resolution: 3000000/10000
    Resolution Unit: 2

6.3.1-7 :

Code: Select all

  Resolution: 72x72

6.3.2-9, 6.3.3-10 and 6.3.4-10 :

Code: Select all

  Resolution: 72x72
  Exif:ResolutionUnit: 2
  Exif:XResolution: 72/1
  Exif:YResolution: 72/1

6.3.5-10 :

Code: Select all

  Resolution: 300x300
  Exif:ResolutionUnit: 2
  Exif:XResolution: 72/1
  Exif:YResolution: 72/1

6.3.6-10, 6.3.8-11, :

Code: Select all

  Resolution: 300x300
  Exif:ResolutionUnit: 2
  Exif:XResolution: 72/10000
  Exif:YResolution: 72/10000

6.3.9-10 and 6.4.0-11 :

Code: Select all

  Resolution: 300x300
    exif:ResolutionUnit: 2
    exif:XResolution: 72/10000
    exif:YResolution: 72/10000

6.4.2-10 :

Code: Select all

  Resolution: 0.0072x0.0072
    exif:ResolutionUnit: 2
    exif:XResolution: 72/10000
    exif:YResolution: 72/10000

6.4.3-10, 6.4.4-10 :

Code: Select all

  Resolution: 0.03x0.03
    exif:ResolutionUnit: 2
    exif:XResolution: 300/10000
    exif:YResolution: 300/10000

6.4.5-9 :

Code: Select all

  Resolution: 0.03x300
    exif:ResolutionUnit: 2
    exif:XResolution: 300/10000
    exif:YResolution: 300/1

6.4.6-9, 6.4.7-10, 6.4.8-10 and 6.4.9-8 :

Code: Select all

  Resolution: 0.0072x72
    exif:ResolutionUnit: 2
    exif:XResolution: 72/10000
    exif:YResolution: 72/1

Am I doing something wrong or is this irradic behavior usual?

The erratic behavior is in response to bugs problems and queries. Basically Cristy (Magick) attempts to improve or fix things according to bug reports, and as a result the output here changes.

If you don't want this then try to figure out what SHOULD be output, not just for you but for everyone and look/fix at the code.

Legacy ImageMagick Discussions Archive

Resolution problems

Resolution problems

Re: Resolution problems