Utilities

Image Difference

Image Difference This node shows the difference between two images. This is useful for visualizing denoising and upscaling.

OpenCV Denoise

Based on the opencv script here. It removes noise left behind by the diffusion process.

ComfyUI seems to limit nodes to a single core, so using the CPU for this node is excruciatingly slow.

GPU selection on multi-GPU systems on Linux

If you want to use a specific gpu on a multi-gpu system, use clinfo -l to get a list of devices and set the environment variable OPENCV_OPENCL_DEVICE to <platform>:GPU:<index>, where <platform> is everything listed after Platform #*: and <index> is the Device #. For example:

Platform #0: Intel(R) OpenCL Graphics
 `-- Device #0: Intel(R) Arc(TM) B580 Graphics
Platform #1: rusticl
 `-- Device #0: AMD Radeon RX 6800 (radeonsi, navi21, LLVM 21.1.6, DRM 3.64, 6.18.2-arch2-1)

Here you would use OPENCV_OPENCL_DEVICE=Intel(R) OpenCL Graphics:GPU:0 or OPENCV_OPENCL_DEVICE=rusticl:GPU:0