Comfy-Org / Comfy-Org/ComfyUI

After turning on the canny_controlnet node in the workflow, the graphic becomes ugly, gray and blurry, which has been bothering me for a few days now.

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Description

After turning on the canny_controlnet node in the workflow, the graphic becomes ugly, gray and blurry, which has been bothering me for a few days now.The picture quality is very different。
![open-canny](https://github.com/comfyanonymous/ComfyUI/assets/151808198/d2f03c1e-cd5e-410b-89ab-7dcf3c27136f)
![close-canny](https://github.com/comfyanonymous/ComfyUI/assets/151808198/ebc80db6-023a-4b70-ab27-cfb5b55369f7)

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