Software⏱️ 3 min read📅 2026-06-15

How to Fix: Tesseract can't scan `Error:Only 1,2,4,5,6,8 bpp are supported:32`

Tesseract OCR engine error: unsupported bpp value.

Quick Answer: Check the image depth after conversion and try a different method, such as using Tesseract's --psm option.

📋 Table of Contents

  1. 💡 Why You Are Getting This Error
  2. ✅ Best Solutions to Fix It
  3. 💡 Conclusion

The error 'Only 1,2,4,5,6,8 bpp are supported:32' occurs when Tesseract Open Source OCR Engine encounters an image with a depth of 32 bits per pixel (bpp), which is not supported by the engine.

This issue can be frustrating for users who rely on Tesseract for document scanning and analysis. However, don't worry, we have some steps to help you resolve this problem.

💡 Why You Are Getting This Error

  • The primary reason for this error is that Tesseract's default configuration does not support images with a depth of 32 bpp. This limitation is due to the engine's architecture and requirements.
  • An alternative explanation is that the image may be corrupted or have an incorrect metadata, leading to this error.

✅ Best Solutions to Fix It

Adjusting the Tesseract Configuration

  1. Step 1: Run the command `tessedit_adaptive_threshold=0` before running the OCR engine. This sets the adaptive threshold to 0, which may help Tesseract handle images with a depth of 32 bpp.
  2. Step 2: Try using the `--oem 3` option when running Tesseract, as it enables the OCR engine's 'Lattice' model, which is more robust and can handle higher bit depths.
  3. Step 3: If none of the above steps work, try converting the image to grayscale using `convert canvas.png -colorspace Gray canvas.tif` before running Tesseract.

Converting the Image

  1. Step 1: Use the command `convert canvas.png -depth 8 canvas.tif` to convert the image to 8-bit depth. This may resolve the issue if the original image was too deep.
  2. Step 2: If the above step doesn't work, try converting the image using `convert canvas.png -colorspace sRGB canvas.tif`, which uses a different color space that Tesseract supports.

💡 Conclusion

To summarize, the error 'Only 1,2,4,5,6,8 bpp are supported:32' occurs due to Tesseract's limitations on 32-bit pixel depth. By adjusting the Tesseract configuration or converting the image to a supported depth, you should be able to resolve this issue and successfully scan your document using Tesseract.

Did this fix your problem?

If not, try searching for specific error codes.

🔍 Search Error Database

❓ Frequently Asked Questions

🛠️ Related Fixes

How to Fix: Pc crashes shortly after launching game (rainbow

Fix Pc crashes shortly after launching game (rainbow six siege). Compl

How to Fix: Installing an APK on a locked down phone

Installing an APK on a locked down phone: Try using a rooted device, e

How to Fix: New PC build- no signal and no clue

Fix New PC build- no signal and no clue. Complete troubleshooting guid