Export GeoTIFF/JPEG - change compression ratio

STH
STH Global Mapper UserTrusted User
edited November 2007 in Suggestion Box
Is it possible to add an option so you may change the compression ratio on the JPEG in GeoTIFF/JPEG- exports?`Ie set the Q- factor. I can see that the default it is set to is 25 - which is too much compression. Either set it in the: Tools - Configure - General- tab, or set it when exporting to this format.

Comments

  • global_mapper
    global_mapper Administrator
    edited November 2007
    The default JPEG-in-TIFF quality setting should be set to 75%, which is the standard default quality setting for JPEG-in-TIFF files. Would a registry setting for changing this work for you? I doubt that most people would need a non-default value so I don't want to clutter the interface with a slider (plus I'm lazy :).

    Thanks,

    Mike
    Global Mapper Support
    support@globalmapper.com
  • STH
    STH Global Mapper User Trusted User
    edited November 2007
    If you are lazy then I`m an alien. You fix errors and add features faster than I can check my e-mail. Yes, a registry setting is sufficient:)
  • global_mapper
    global_mapper Administrator
    edited November 2007
    I have added support for a new DWORD registry setting at HKEY_CURRENT_USER\Software\Global Mapper\JpegInTiffQuality to control the JPEG-n-TIFF quality. The default value is 75. The valid range is 25 to 100, with 100 being lossless. I have placed a new build at http://www.globalmapper.com/global_mapper9.zip with the change for you to try. Simply download that file and extract the contents into your existing v9.xx installation folder to give it a try.

    Let me know if I can be of further assistance.

    Thanks,

    Mike
    Global Mapper Support
    support@globalmapper.com
  • STH
    STH Global Mapper User Trusted User
    edited November 2007
    Found the correct registry setting, and added the DWORD JpegInTiffQuality and set it to 90. However it does not seem to be used in GlobalMapper. i have also restarted the machine, but I guess that is not needed. Will try more tomorrow, long day.

    I wish you a good night and hope you get a vacation soon.
  • global_mapper
    global_mapper Administrator
    edited November 2007
    Check the build date and time of your Global Mapper under the Help menu. Sometimes you'll get an older cached version of the global_mapper9.zip file if you've downloaded it recently, so your build isn't updated.

    Thanks,

    Mike
    Global Mapper Support
    support@globalmapper.com
  • STH
    STH Global Mapper User Trusted User
    edited November 2007
    Build time: Nov 22 2007 16:02:13. This corresponds to the date on the EXE-file.
  • global_mapper
    global_mapper Administrator
    edited November 2007
    I took a look and found that I had only made the change for GeoTIFFs exported from rasterized vectors and not the general case. I have placed a new build at http://www.globalmapper.com/global_mapper9.zip with this fixed for you to try. Simply download that file and extract the contents into your existing v9.xx installation folder to give it a try.

    Let me know if I can be of further assistance.

    Thanks,

    Mike
    Global Mapper Support
    support@globalmapper.com
  • STH
    STH Global Mapper User Trusted User
    edited November 2007
    Ah, splendid. Just in time for project delivery in a couple of hours. Thanks alot! Have a nice weekend

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