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openclaw - 💡(How to fix) Fix image tool: 'Failed to optimize image' on valid JPEG exceeding imageMaxDimensionPx default (1200px) [1 comments, 2 participants]

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openclaw/openclaw#75742•Fetched 2026-05-02 05:30:55
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PrinceOfEgyptPrinceOfEgypt
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The image tool fails with Failed to optimize image when processing a valid JPEG whose dimensions exceed the imageMaxDimensionPx default of 1200px. The image itself is well-formed and small in file size — the failure occurs in the resize/optimization pipeline, not during ingestion.

Error Message

error [tools] image failed: Failed to optimize image raw_params={"prompt":"...","image":"/home/ubuntu/.openclaw/media/inbound/a790d532-48b4-4c58-87f2-56bbae34cdc4.jpg"}

Root Cause

  • A 237KB JPEG at 1284px wide is a completely normal phone screenshot. The resize path should handle this gracefully.
  • Workaround: setting imageMaxDimensionPx: 2400 avoids triggering the resize path and allows the image through.
  • The error is silent to the end user — they only see the tool failure, not the root cause.

Fix Action

Fix / Workaround

  • A 237KB JPEG at 1284px wide is a completely normal phone screenshot. The resize path should handle this gracefully.
  • Workaround: setting imageMaxDimensionPx: 2400 avoids triggering the resize path and allows the image through.
  • The error is silent to the end user — they only see the tool failure, not the root cause.

Code Example

error [tools] image failed: Failed to optimize image

---

error [tools] image failed: Failed to optimize image raw_params={"prompt":"...","image":"/home/ubuntu/.openclaw/media/inbound/a790d532-48b4-4c58-87f2-56bbae34cdc4.jpg"}
RAW_BUFFERClick to expand / collapse

Summary

The image tool fails with Failed to optimize image when processing a valid JPEG whose dimensions exceed the imageMaxDimensionPx default of 1200px. The image itself is well-formed and small in file size — the failure occurs in the resize/optimization pipeline, not during ingestion.

Steps to Reproduce

  1. Send a JPEG image attachment via Discord (or any channel) where either dimension exceeds 1200px
  2. Call the image tool with a prompt and the inbound image path
  3. Observe: Failed to optimize image

Environment

  • OpenClaw version: 2026.4.23+
  • Host OS: Linux (ARM64, Oracle Cloud)
  • Image file: JPEG, 1284×2778px, 237KB, valid EXIF (orientation=upper-left), baseline, 8-bit sRGB
  • imageMaxDimensionPx: not set (default: 1200)
  • Error message: Failed to optimize image

Actual Behavior

error [tools] image failed: Failed to optimize image

The tool fails entirely — no fallback, no partial result.

Expected Behavior

Either:

  • Successfully downsample the image to fit within imageMaxDimensionPx and pass it to the vision model, or
  • Return a clear, actionable error message (e.g. "image too large, please set imageMaxDimensionPx higher")

Notes

  • A 237KB JPEG at 1284px wide is a completely normal phone screenshot. The resize path should handle this gracefully.
  • Workaround: setting imageMaxDimensionPx: 2400 avoids triggering the resize path and allows the image through.
  • The error is silent to the end user — they only see the tool failure, not the root cause.

Logs

error [tools] image failed: Failed to optimize image raw_params={"prompt":"...","image":"/home/ubuntu/.openclaw/media/inbound/a790d532-48b4-4c58-87f2-56bbae34cdc4.jpg"}

extent analysis

TL;DR

Increase the imageMaxDimensionPx value to allow the image tool to process larger images without failing.

Guidance

  • Verify that the image dimensions are the cause of the failure by checking the image size and the imageMaxDimensionPx value.
  • Consider setting imageMaxDimensionPx to a higher value, such as 2400, to avoid triggering the resize path and allow the image to be processed.
  • Check the logs to ensure that the error message is accurate and provides enough information to diagnose the issue.
  • Test the image tool with different image sizes and imageMaxDimensionPx values to determine the optimal configuration.

Notes

The current implementation of the image tool does not handle large images gracefully, and increasing the imageMaxDimensionPx value is a temporary workaround. A more robust solution would be to modify the resize/optimization pipeline to handle larger images or provide a clear error message when the image exceeds the maximum allowed size.

Recommendation

Apply workaround: increase the imageMaxDimensionPx value to a higher number, such as 2400, to allow the image tool to process larger images without failing. This will provide a temporary solution until a more robust fix can be implemented.

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#optimization#GPU compatibility#latency issue#model loading#dependency error

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