If you're having trouble exporting images in Capture One, there are several possible causes. This article covers the most common reasons image exports fail, how to fix them, and how to prevent these issues in the future.
Contents
- Compatibility
- Why won't my images export?
- Case 1. Export Queue is paused
- Case 2. Export Queue is stuck due to a corrupt file
- Case 3. Export Recipe is corrupt
- Case 4. Export Recipe is not enabled
- Case 5. 'Edit All Selected Variants' is disabled
- Case 6. Capture One crashes when exporting
- Case 7. Why can't I export more than one image?
- Case 8. Capture One exports only .tmp files
Compatibility
This guide applies to:
- Capture One for macOS
- Capture One for Windows
Why won't my images export?
There are a few common reasons why images fail to export:
- The Export Queue is paused
- A corrupt file is blocking the Export Queue
- An Export Recipe is corrupt
- An Export Recipe is not enabled
- "Edit All Selected Variants" is not turned on
- Capture One crashes at the point of exporting images
- Only one image is exporting
- Capture One generates .tmp file instead of a JPEG/TIFF image
Case 1. Export Queue is paused
If your Export Queue is paused, export jobs won't process — even if they’ve been added to the queue. You’ll see an orange export icon on the thumbnail to indicate this.
To resume exporting:
- Go to the Tool Tabs.
- Click the '…' icon on the far right.
- Add the Export Tool Tab to your workspace.
- Scroll to the bottom of the Export Tool Tab to find the Export Queue.
- Click Start to resume processing all images in the queue based on the selected Export Recipe.
You can remove individual export jobs by selecting the image and pressing Backspace.
Case 2. Export Queue is stuck due to a corrupt file
A corrupt image or file can cause the Export Queue to hang, blocking all subsequent exports.
To clear the queue:
- Go to Export Queue>'…'>Clear Queue
- Or select the specific image and press Backspace
If that doesn't work, navigate to the following folder:
- macOS: ~/Library/Application Support/Capture One/
- Windows: %LocalAppData%\CaptureOne
...and manually delete the batch queue cache folder (BatchXXX, e.g. Batch144 or Batch120, or Batch 15.0)
Then restart Capture One to reset the queue.
Case 3. Export Recipe is corrupt
Occasionally, an Export Recipe may become corrupted and cause the export to fail.
To resolve:
- Try using a different Export Recipe to test.
- If it works, recreate the original recipe from scratch.
To create a new recipe, hit plus sign at the bottom of the Export Recipe tool:
Case 4. Export Recipe is not enabled
An Export Recipe must be both ticked and highlighted in orange in the Export Recipes tool to be active.
If the recipe is highlighted but not checked, you'll see a warning. Tick the checkbox to enable the recipe and proceed with the export.
Case 5. 'Edit All Selected Variants' is disabled
If Edit All Selected Variants is not enabled, only the primary variant (the one selected in the browser) will export.
To enable:
- Go to Image>Edit All Selected Variants.
- Make sure there's a checkmark next to it.
Case 6. Capture One crashes when exporting
This may indicate an issue with the Hardware Acceleration pipeline.
-
On macOS, go to Capture One>Settings. On Windows, go to Edit>Preferences.
- In the General tab under Hardware Acceleration, set Image Processing to Never. Older versions may have Display and Processing, so disable both.
- Restart Capture One to apply the changes.
Learn more about Hardware Acceleration in this article: Troubleshooting Hardware Acceleration in case of viewing / processing / exporting problems
Tips and best practices
- You can use multiple Export Recipes and process images in one batch.
- You can drag and drop images directly into the Export Queue.
- Always verify selected variants before batch exporting.
- Restart Capture One after clearing the cache if issues persist.
- Double-check all Export Recipe settings before exporting.
- Ensure storage locations in the recipe are valid and accessible.
Case 7. Why can't I export more than one image?
Different actions like Exporting will be applied only to the primary variant unless "Edit All Selected Variants" is selected. This one should be activated by default. If that is not your case:
Go to the menu Image > Edit All Selected Variants.
If this is not ticked on, adjustments and edits will only apply for the primary selected variant.
You might have the icon in your toolbar as well. When it is orange, it is turned on and all your selected images will get exported.
If you don’t have the icon in your toolbar, you can add it by:
Customizing toolbar:
Editing primary / all selected variants
Case 8. Capture One exports only .tmp files
When Capture One exports an image, it temporarily adds .tmp to the filename. This prevents other applications from accessing the file while it’s still being processed. Once rendering finishes, Capture One should automatically remove the .tmp extension.
If the file keeps the .tmp ending and doesn’t export correctly, it usually means something is preventing Capture One from renaming or finalizing the file.
Possible causes
- A third-party app (like a backup tool, antivirus, or malware scanner) is accessing or locking the file during export.
- Folder permissions prevent Capture One from renaming, moving, or deleting the temporary file.
How to fix it
- Export or process an image to a different location where Capture One has full access, such as your desktop.
- Temporarily disable background apps like antivirus or cloud backup software.
- Verify Capture One has full disk access. For help, see: Allowing Capture One to have full access on macOS
Comments
19 comments
I've worked through all these tips but unfortunately I continue to get the same error: could not process file.
I'm not able to find any other suggestions or solutions to this problem. Any other solves??
Hi Alexandra,
Thank you for your question.
Please, provide more details on which operating system and Capture One version (and also product variant) you currently use. Also, please let me know which file format are you trying to process. It would be great if you send a screenshot of the process recipe as well.
Hello
I had the same thing happen when my hard drive was to full to take more images. After deleting old work and freeing up a lot of hard drive, I still got the error message that it still could not process.
I quit capture and then went into the job's Session folder on my drive, and in the Capture folder, I deleted the Cache folder and emptied the trash on my Mac.
I restarted the session and was able to process all my files!
Such a relief. I hope it helps you.
Peter
Thank you very much. I had the same problem with the batch queue, and a fix it by manually erasing the cache, as you recommended.
I have the same problem, I do all the above requirements but stil the image is not processing. I have a window that said: Could not process file
What the hell is going on with this, and where is the support?
I am having the same issue all of a sudden, and I am now late on a deadline because nothing at all will fix this issue.
I have cleared the cache. I have renamed the files. I have moved the files to a new location. I have tried starting an entirely new session after following all of the above steps. And still I get an error 'Could not process file' with absolutely no additional information. The .CR2 files are not corrupt and open fine into Photoshop.
How about some assistance.
Hi Mihal,
I see that you have a notification "error loading adjustment mask". Which version of Capture One are you currently using?
Also, I see that you have the icon Edit All Selected in grey (which means that it is disabled), so only the Primary Variant can be processed at a time.
Hi Ryan,
Which Capture One version are you currently using?
Which product variant (Pro, Express, etc.) are you currently using?
Files from which camera are there?
What process recipe do you use?
Have you tried to export the images? If yes, was there the same error appearing?
I'm having this problem too. I'm on Windows 10 and I can neither process or export a RAF file from my Fuji X100V files whether I make adjustments or not. I'm using Capture One 12 Pro Fujifilm. It just sits there at 0.00s no matter how many images I have. All files are on my local hard drive.
Hi Paul,
First of all, click Stop and then Start again in the Batch tool.
Try to check the location to which the images would be sent after processing.
As an alternative, export images from the main menu File -> Export Images -> Variants.
If that does not help, disable OpenCL from the Edit -> Preferences -> General -> Hardware Acceleration.
Disabling OPEN CL Worked!
Hardware Acceleration Display: Auto, Processing: Never
Thanks for the quick response! I spent about 6 hours trying to get this to work over the weekend. Please add this solution to the main article as an additional option.
^^^
Yeah harware acceleration is bugged or something. Need to turn that off until it's fixed to avoid export errors.
None of this has worked and it is really getting annoying that this program is unable to export panorama files with any consistency. I get the error message of "mask handle error - 61 - resMaskHandleError" then I have to close down the program because I am then unable to export any file even after clearing the history.
Today my up-to-date version of Capture One stopped exporting. I used the tip above to clear the queue on my M1 Mac, and it worked! Thank you for this information, without which I was helpless to fix the problem.
NOW, how about getting your developers to fix the bug?
Also have the exporter offer the user a clue when the export failed. I got no error message at all; just nothing happened after I chose the export function.
Overall between trying and retrying, then experimenting with shutting down and restart, and then searching online desperately for an answer, I lost almost an hour of my time to this bug. Please get it fixed or at least have C1 offer a helpful error message.
Thank you.
Art
I have similar issue like @... , "mask handle error - 61 - resMaskHandleError", the only difference is that I do not have a panorama but an image with 5 healing layers and that's all.
Restarting the program fixed the issue.
This is getting ridiculous. I think I may have to decide to go back to Lr. I can export other files from my session but only 1 DNG panorama file is giving the error. I am on Mac. I know if I can install C1 on my windows machine that it will work. So frustrating.
Hi I am trying to export my images but it will not allow me to add a recipe. It will not let me do any high res images. how od I change this? it lets me select and then says it is not enabled
39 out of 380 found this helpful <-- not very good Capture One. I don't plan to renew.
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