OpenCV cvtColor error with COLMAP dataset

[philippgehrke]

I am encountering an OpenCV error when running OpenSplat on the COLMAP sample dataset (gerrard-hall). The error is:

terminate called after throwing an instance of 'cv::Exception' what(): OpenCV(4.5.4) ./modules/imgproc/src/color.cpp:182: error: (-215:Assertion failed) !_src.empty() in function 'cvtColor'

It is the official colmap dataset Gerrard Hall and the issue does not occur with the sample banana dataset, which works perfectly.

I've verified that all images in the dataset are valid