Generates an image in SDXL and upscale it to 2x the original resolution using Tile Controlnet, Tiled Diffusion and colour matching. You can provide your own image (e.g. from Flux) for upscaling and disable the image generation process.
Nodes
Install the following custom nodes using ComfyUI Manager:
rgthree's ComfyUI Nodes
KJNodes for ComfyUI
ComfyUI Essentials
ComfyUI-Advanced-ControlNet
Tiled Diffusion & VAE for ComfyUI
Models Required
Checkpoint:
Dreamshaper Turbo https://civarchive.com/models/112902?modelVersionId=351306
You can use your favourite checkpoint but be sure the change the settings in the KSampler
Tile Controlnet:
xinsir/ControlNet++: All-in-one ControlNet (ProMax model) - higher detail
xinsir/ControlNet Tile SDXL (better colours)
This workflow implements the ideas from this video by Latent Vision:
Description
Re-introduced the Tiled KSampler as the Random Strict Tiling Strategy seems to have solved the artifacts issue.
Introduced a line art / depth controlnet to allow the output image to better follow the structure of the image to be upscaled.