The attached plug-in for Mac OS and registry keys for Windows allows you to save large PSD and PSB images without compression. The resulting size of your image is much larger. However, saving the file can be much faster, if you have a fast hard disk and enough disk space to hold the larger file size.

The attached plug-in for Mac OS and registry keys for Windows only works with the following versions of Photoshop:

  • Photoshop CS5 (version 12.1 which comes with Creative Suite 5.5)
  • Photoshop CS5 (version 12.0.4 which comes with Creative Suite 5)

Update Photoshop CS5 to version 12.0.4

  1. Open Photoshop.

  2. Choose Help > Updates and follow the instructions: Keeping Photoshop Up-To-Date.

Download and install the plug-in on Mac OS

  1. Quit Photoshop.
  2. Ctrl-click the plug-in below and choose to save the file. Remember the location that you chose.
  3. After it's downloaded, double-click the file to unzip the plug-in.
  4. Move the DisallowFlateCompressionPSD.plugin file to the Adobe Photohop/Plug-ins/Extensions folder.
  5. Restart Photoshop.

Download and install registry keys on Windows

Disclaimer: These steps require you to modify the Windows registry, which contains critical information about your system and applications. Before modifying the registry, always make a backup copy of it. Adobe doesn't provide support for problems that arise from improperly modifying the registry. For information about the Windows registry, see the documentation in Windows or contact Microsoft Technical Support or your computer's manufacturer.

  1. Quit Photoshop.
  2. Right-click the DisallowFlateCompressionRegKeys.zip link below and choose to save the file. Remember the location that you chose.
  3. After it's downloaded, double-click the file to unzip the DisallowFlateCompressionRegKeys.zip file.
  4. To enable DisallowFlateCompressedPSD, double-click DisallowFlateCompressedPSD_ON_D.reg.
    • If you have UAC (Windows User Account Control) enabled, click Yes in the UAC dialog.  If you don’t have UAC enabled, click Yes on the first dialog (Registry Editor). Then click OK in the second dialog that confirms that the registry key has been successfully added to the registry.  
  5. Restart Photoshop to see the new behavior (saving large PSB files without flate compression).

  1. To disable DisallowFlateCompressedPSD first quit Photoshop, then double-click DisallowFlateCompressedPSD_OFF.reg.
  2. Restart Photoshop re-enables the default behavior of saving large PSB images with flate compression.

 

 

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