Coding⏱️ 2 min read📅 2026-06-03

How to Fix: imread returns None, violating assertion !_src.empty() in function 'cvtColor' error

Error in OpenCV's cvtColor function due to incorrect image format. Solution involves converting TIFF image to RGB format.

Quick Answer: Convert TIFF image to RGB format before passing it to cvtColor.

The error 'imread returns None, violating assertion !_src.empty() in function cvtColor' occurs when the image file specified by the imread function is not found or cannot be read.

✅ Best Solutions to Fix It

Method 1: Check the Image File Path

  1. Step 1: Verify that the image file 'frames/frame%d.tiff' exists in the specified path.

Method 2: Use Absolute Paths

  1. Step 1: Replace the relative path 'frames/frame%d.tiff' with an absolute path, such as '/Users/travis/images/frame%d.tiff', to ensure that the image file is found.

Method 3: Use try-except Blocks

  1. Step 1: Wrap the imread function in a try-except block to catch any exceptions that may occur.

By implementing these methods, you can resolve the 'imread returns None' error and successfully perform color conversion using OpenCV.

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