About Registry Keys

Adobe® Photoshop® CS2
About Registry Keys

These registry key files are here to allow users to work around certain specific issues under the guidance of Technical Support. Using them changes entries in your Windows registry file. They are intended to allow users who don't feel comfortable editing the registry, to still change those Photoshop settings that don't warrant their own control in the User Interface. It should be very rare that any user needs to use any of these registry files.
To use a registry key:

1. Exit Photoshop.
2. Copy the Registry Key file to your hard disk from the Goodies/Optional Plug-Ins/Photoshop Only/Optional Extensions folder on the Adobe Photoshop CD-ROM.
3. Back up your registry if desired, by choosing Start > Run and typing in "regedit" without the quotation marks. Choose File > Export and select a location and name for your backup registry that is easy to find if you need to use the backup file. Click Save. Exit from the Registry Editor.
4. Double click the .reg file that you copied to your hard drive. Click Open in the File Download window, and click Yes in the Registry Editor window when asked if you are sure you want to add this information to the registry. Click OK in the Registry Editor confirmation window.
5. Launch Photoshop.

Allow Network Scratch Registry Key
AllowNetworkScratch_OFF_D.reg
AllowNetworkScratch_ON.reg
Adobe Photoshop CS2 does not list network drives in the Plug-Ins & Scratch Disks preferences window by default. Using a network drive as a scratch disk will significantly decrease Photoshop's performance and may contribute to file corruption.
Running the Allow Network Scratch registry key allows you to use a network drive as a scratch disk, by listing the network drives currently mapped to your computer in each of the scratch disk pop-up menus in Edit > Preferences. To disable this function, use these instructions to run the AllowNetworkScratch_OFF_D.reg file.

Allow Removable Scratch Registry Key
AllowRemovableScrtch_OFF_D.reg
AllowRemovableScrtch_ON.reg
Adobe Photoshop CS2 does not list removable media drives, such as Zip or floppy drives, in the Plug-Ins & Scratch Disks preferences window by default. Using a removable media drive as a scratch disk may significantly decrease Photoshop performance and may contribute to file corruption. Running the Allow Removable Scratch registry key allows you to use a removable media drive as a scratch disk, by listing the removable media drives currently attached to your computer in each of the scratch disk pop-up menus in Edit > Preferences. Writable or re-writable CD-ROM drives are not listed. To disable this function, use these instructions to run the AllowRemovableScratch_OFF_D.reg file.

Allow Import Clipboard Registry Key
AlwaysImportClipdb_OFF_D.reg
AlwaysImportClipdb_ON.reg
By default, Adobe Photoshop CS2 aggressively checks for clipboard changes before it reimports data. When Photoshop finds a reported change, it fails to reimport modified data. Activating this registry key allows Photoshop to always reimport changed clipboard data. To disable this function, use these instructions to run the AlwaysImportClipdb_OFF_D.reg file.

Always Show Palettes Registry Key
AlwaysShowPalettes_OFF_D.reg
AlwaysShowPalettes_ON.reg
By default, Adobe Photoshop CS2 hides its palettes when another application is activated while Photoshop is running (thereby deactivating Photoshop). The Always Show Palettes registry key allows Photoshop's palettes to be displayed when Photoshop is deactivated. To allow palettes to be hidden again when Photoshop is deactivated, use these instructions to run the AlwaysShowPalettes_OFF_D.reg file.

Bad Driver RGB Check Registry Key
BadDriverRGBlitCheck_OFF.reg
BadDriverRGBlitCheck_ON_D.reg
Some display adapter drivers can cause display errors in Adobe Photoshop CS2 if they don't send colors to the screen in an expected way. By default, Photoshop checks to determine if the colors will be written as expected. To stop Photoshop from checking this color data, run the BadDriverRGBlitCheck_OFF.reg file. To reestablish this color checking, use these instructions to run the BadDriverRGBlitCheck_ON_D.reg file.

Bad Driver Sticky Cursor Registry Key
BadDriverStickyCrsr_OFF_D.reg
BadDriverStickyCrsr_ON.reg
Some display adapter drivers can cause cursor malfunctions in Adobe Photoshop CS2, such as the cursor not changing from one tool icon to another. By default, Photoshop allows the display adapter driver to perform all its regular functions. If a driver causes problems with the cursor in Photoshop, turning on this registry key gives Photoshop more cursor control, helping to solve the problem. To give the display adapter driver full cursor control again, use these instructions to run the BadDriverStickyCrsr_OFF_D.reg file.

Blit Single Scan Lines Registry Key
BlitSingleScanLines_OFF_D.reg
BlitSingleScanLines_ON.reg
Some display adapter drivers can malfunction when you use Adobe Photoshop CS2. By default, Adobe Photoshop CS2 allows the display adapter driver to perform all its regular functions. If a driver is causing problems in Photoshop, turning on this registry key may reduce display problems. To turn off this registry key, use these instructions to run the BlitSingleScanLines_OFF_D.reg file.

Clipboard Size Limit Registry Key
ClipboardSizeLimit_OFF.reg
ClipboardSizeLimit_ON_D.reg
Some applications become prone to crashing when large files are copied to the clipboard. Because of this, by default Adobe Photoshop CS2 imposes a 4 megabyte limit on the size of any image it exports to the clipboard.
Running the Clipboard Size Limit_OFF.reg file removes this limit, allowing you to export larger images to the clipboard, but increasing the chance that other applications will crash because of the amount of data on the clipboard. To reactivate this function, use these instructions to run the Clipboard Size Limit_ON_D.reg file.

Disable Scratch Compression Registry Key
DisableScratchCmprs_OFF_D.reg
DisableScratchCmprs_ON.reg
By default, Adobe Photoshop CS2 compresses pages before it writes them to the scratch file. This does not result in smaller scratch files, because Photoshop must still reserve scratch space for the uncompressed pages. For slow hard disks or some SCSI implementations, however, reducing the page size allows for faster disk transfer time, and this compensates for the time needed to compress and decompress the pages. If you are using a fast hard disk or SCSI implementation, you do not need this compression.
Running the DisableScratchCmprs_ON.reg file turns off the scratch page compression, and may provide a slight performance increase on computers with fast hard disks and SCSI implementations. To turn on scratch compression again, use these instructions to run the DisableScratchCmprs_OFF_D.reg file.

Force VM Compression Registry Key
ForceVMCompression_OFF_D.reg
ForceVMCompression_ON.reg
To decrease the time it takes to save files, Adobe Photoshop CS2 does not, by default, aggressively compress files for scratch disk (VM, or virtual memory) optimization before it saves them. When the scratch disk is on the same disk that a file is saved to, and there is little free hard disk space left, aggressive scratch disk compression can increase the amount of space available for saving a file.
The ForceVMCompression registry key forces aggressive scratch disk compression to take place before each file is saved. Saving files is slower when this registry key is enabled, but it makes more disk space available during the save. To turn this function off, use these instructions to run the ForceVMCompression__OFF_D.reg file.

Ignore EXIF sRGB Registry Key
IgnoreEXIFsRGB_OFF_D.reg
IgnoreEXIFsRGB_ON.reg
By default, Adobe Photoshop CS2 reads and applies the EXIF color profile tags that are written to digital camera images. Some cameras incorrectly code their color profile tag as sRGB, causing images to display incorrectly in Photoshop. This registry key forces Photoshop to ignore the color profile tag specified by the EXIF metadata, allowing you to assign the appropriate profile to your images in Photoshop. To turn this function off, use these instructions to run the IgnoreEXIFsRGB_OFF_D.reg file.

Optimize Redraw Drawing Registry Key
OptimizeResizeDrawing_OFF.reg
OptimizeResizeDrawing_ON_D.reg
By default, Adobe Photoshop CS2 slows the display of real-time resizing for display adapter cards that are not able to display this redrawing as fast as Photoshop can perform it. To turn off this optimization, run the OptimizeResizeDrawing_OFF.reg file. To reactivate this function, use these instructions to run the OptimizeResizeDrawing_ON_D.reg file.

Print Passthrough Registry Key
PrintPassthrough_NORM_D.reg
PrintPassthrough_PASS.reg
PrintPassthrough_PS_PASS.reg
By default, Adobe Photoshop CS2 assumes that you want to use the Windows GDI to print, which is the normal passthrough mode. Changing the passthrough mode might improve printer compatibility in rare cases. To return to the default print passthrough method, use these instructions to run the PrintPassthrough_NORM_D.reg file.

Remember Slow Files Registry Key
RememberSlowFiles_OFF_D.reg
RememberSlowFiles_ON.reg
By default, Adobe Photoshop CS2 removes files from its Open Recent file list if locating and opening the file takes longer than 1/3 second. Some removable devices and network drives may take longer than this.
Running the Remember Slow Files registry key prevents the Open Recent list from forgetting about files that take too long to resolve when the list is updated; it allows up to 20 seconds to resolve the file locations. However, saving or opening a file may take longer if this registry key is activated. To turn this function off, use these instructions to run the RememberSlowFiles_OFF_D.reg file.

Show Windows Thumbnails Registry Key
ShowWindowsThumbnails_OFF.reg
ShowWindowsThumbnails_ON_D.reg
By default, Adobe Photoshop CS2 allows thumbnails to be displayed in its Open dialog box. If you prefer not to show image thumbnails in this window, you can turn off this registry key. To reactivate the Show Windows Thumbnails registry key, use these instructions to run the ShowWindowsThumbnails_ON_D.reg file.

Warn Save Prefs Failure Registry Key
WarnSavePrefsFailure_OFF.reg
WarnSavePrefsFailure_ON_D.reg
By default, Adobe Photoshop CS2 warns you if it cannot save its preferences file when you exit the application. If you don't wish this warning to display, turn off this function with the WarnSavePrefsFailure_OFF.reg file. To reactivate the Warn Save Prefs Failure registry key, use these instructions to run the WarnSavePrefsFailure_ON_D.reg file.

Use Async I/O Registry Key
UseAsyncIO_OFF.reg
UseAsyncIO_ON_D.reg
By default, Adobe Photoshop CS2 uses asynchronous file handling, data transfer that doesn't occur at predetermined or regular intervals, to improve performance when reading and writing files.
Asynchronous I/O (Input/Output) can conflict with networking software, causing damage when saving images to or opening them from a network drive. If these problems occur, you may want to turn this function off. To reactivate the Use Async I/O registry key, use these instructions to run the UseAsyncIO_ON_D.reg file.

Use Async Scratch Registry Key
UseAsyncScratch_OFF_D.reg
UseAsyncScratch_ON.reg
By default, Adobe Photoshop CS2 does not use asynchronous file handling, data transfer that doesn't occur at predetermined or regular intervals, when writing to its virtual memory file, the scratch disk. Asyncronous I/O (Input/Output), can improve performance when acessessing the scratch disk.
Asynchronous file handling can conflict with networking software, causing damage when saving images to or opening them from a network drive.To turn this function off, use these instructions to run the UseAsyncScratch_OFF_D.reg file.

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02/16/2005