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Thread: IrfanView 64 bit HDR format

  1. #1
    IV Newbie
    Join Date
    Aug 2018

    Default IrfanView 64 bit HDR format

    Windows 7 64
    IrfanView 4.51 64
    When I open any .hdr file, I get an error: Decode error! Not a valid HDR file.
    Click image for larger version. 

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  2. #2
    Moderator Enterprise User Bhikkhu Pesala's Avatar
    Join Date
    May 2007
    East London
    64-bit Win 10
    CPU Cores


    From the IrfanView Site:

    • Advantages of IrfanView 32-bit over 64-bit version:
    • Runs on a 32-bit and 64-bit Windows
    • Loads all files/images for normal needs (max. RAM size is about 1.3 GB)
    • Needs less disc space
    • All PlugIns will work: not all PlugIns are ported (yet) to 64-bit (like OCR) and some 32-bit PlugIns must be still used in the 64-bit version, some with limitations (see the "Plugins32" folder)
    • Some old 32-bit PlugIns (like RIOT and Adobe 8BF PlugIn) work only in compatibilty mode in IrfanView-64
    • Command line options for scanning (/scan etc.) work only in 32-bit (because no 64-bit TWAIN drivers)

    I created an HDR file using Serif PhotoPlus. I get the error in 64-bit IrfanView, but not in 32-bit IrfanView.

    According to i_plugins.txt, support for HDR is provided by Formats.dll. The version in the Program Files plugins folder is a lot bigger than the one in the 32-bit Program Files (86) plugins folder. It seems that bigger is not better in this case.

    When opened in 32-bit IrfanView, my HDR file is very dark and requires gamma correction.
    Last edited by Bhikkhu Pesala; 25.08.2018 at 09:29 PM.

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