PROBLEM
I'm having problems with exporting/processing images.
My images have artifacts in them when viewing/processing.
Processing/viewing images is slow.
SOLUTION
The issues described above are usually associated with OpenCL (Open Compute Language) which enables the effective utilization of thousands of computing units within modern graphics cards. For Capture One, only relatively new GPU cards have enough computing power and onboard RAM to be utilized effectively. Whilst OpenCL is designed to increase performance in Capture One, you may also find some instances when it can decrease performance instead or cause some issues while processing and editing images. Such issues usually occur on the machines which do not meet our recommended system requirements for running Capture One. You can find those system requirements in the release notes for the particular version of the Capture One software you are using.
The issues that might be related to OpenCL
- Scrambled or somewhat 'glitched' previews when making adjustments
- Crashes when processing/exporting images
- Artifacts in processed images
- Slow processing times
- Slow mask drawing
- Crash when opening Capture One
How to define whether OpenCL is initialized?
- Ensure that OpenCL is set to 'Auto' in your Preferences.
- Reset adjustments on an image.
- Enable the focus mask by going to View > Show Focus Mask in the Capture One main menu.
- Slide the exposure slider gradually.
If the focus mask is disabled while you are increasing your exposure, OpenCL is being utilized. If it remains visible while making these adjustments, then OpenCL has failed to initialize or is not in use.
If Hardware Acceleration is stuck at 0% on initialization (Windows OS)
This is an access issue with Capture One enumerating installed OpenCL platforms. You can fix that by following the steps below:
- Close Capture One, then hold down the Windows key and press the R key on the keyboard.
- Type regedit in the window. This brings up the Registry Editor.
- Select Yes to make changes.
- Go to Computer -> HKEY_Local_Machine -> SOFTWARE -> Khronos -> OpenCL -> Vendors.
- Right-click on IntelOpenCL64.dll and choose Modify.
- Enter "1" (without the quotes) in the Value data field. Press OK.
NOTE (for AMD Radeon RX 5700 graphics card users)
Delete the version-specific preferences folder:
C:\Users\UserName\AppData\Local\Phase_One\CaptureOne.exe_StrongName_y3yh4brhpfi14u41fltdrpfruizxirsn
The last part \(...)_Strongname_(...) might be different for you.
Then restart the computer and Capture One. That way, Hardware Acceleration should be fully initialized.
Learn how to find the AppData folder on Windows
Rebuilding kernels
If you have a machine that meets our recommended system requirements, you may need to rebuild the kernels needed for OpenCL to initialize properly.
Capture One 20.0.0 and later versions
macOS
Close Capture One and then delete the contents of the ImageCore folder as shown in the image below. You can find this folder by navigating to ~/Library/Application Support/Capture One/ImageCore (this can easily be done in Finder via Go > Go To Folder menu item). When you restart Capture One, OpenCL will rebuild the hardware acceleration kernels- let it finish before quitting the software. This rebuild will only need to be done once.
Windows
Similar to the procedure on macOS, delete the contents of the ImageCore folder and restart Capture One, whereby OpenCL will re-initialize.
C:\Users\User_Name\AppData\Local\CaptureOne\ImageCore
Learn how to find the AppData folder on Windows
Capture One 12.1.5 and earlier versions
macOS
Close Capture One and then delete the contents of the ImageCore folder as shown in the image below. You can find this folder by navigating to /Users/Shared/ImageCore (this can easily be done in Finder via Go -> Go To Folder menu item) When you restart Capture One, OpenCL will rebuild the hardware acceleration kernels- let it finish before quitting the software. This rebuild will only be done once.
Windows
Similar to the procedure on macOS, delete the contents of the ImageCore folder and restart Capture One, whereby OpenCL will re-initialize.
Disable OpenCL in Capture One
General guidelines
If viewing, processing, or exporting issues still occur, set the OpenCL options to Never in the General tab. Navigate to the Preferences -> General -> Hardware Acceleration (Use OpenCL for) and set the Display and Processing options to Never. Restart Capture One.
Disable OpenCL in Capture One in case of a crash at startup
• Windows: Run the script DONOT_useopencl.reg and restart Capture One (the download also contains a restore script to re-enable OpenCL useopencl.reg) Download here.
• MacOS: Download AdjustOpenCL_External.zip and run this application AdjustOpenCL_External.app, disable OpenCL, and restart Capture One.
Comments
4 comments
Hi.
First of all thank you very much for your article and i hope you are healthy.
I'm using a Radeon RX 5700 and the weird thing is that i have this problem (Scrambled or somewhat 'glitched' previews when making adjustments) only when adjusting the sliders in the HDR section.
Everywhere else the adjustments are working flawlessly.
Haven't tested everything else so far but i'm wondering why only the HDR part is broken.
Any idea?
My other question is how much of a difference is there between HW-Acc on/off when using a Ryzen 2700x.
Thank you and take care.
Hi,
after deleting the content, the software still doesn't work properly, and when I reinstall C1, the files still missing.
I'm having the issue where hardware acceleration is stuck on 0. I followed the instructions in this post, but
I'm not getting the the IntelOpenCL64.DII.
What I do get is
C:\\Windows\system32\drivers\filerepository\IGLH64.INE_AMD.
The weird thing is I am not aware of having any AMD components on my computer. I have an I7 processor and an Nvidea GTX 1070 graphics.
Any help would be greatly appreciated. I have reached out to Capture One support but these days they seem a bit slow, probably because of the pandemic and everyone sitting at home working on picture files. I'm guessing.
Well, I was getting some help from Capture One support, but it seems to have disappeared with no explanation.
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