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A different approach in the space of upscaling, Rather than upscaling the final image, Latent upscaling in the middle of the process can increase the details in an image significantly. I have implemented this idea in the comfy UI workflow and made an 8K image. This workflow is very good for beginners because i have added few useful notes in it. So feel free to use it and post your work and feedback.

>Select your checkpoint (If you want you can also use lora model for different styles),>Load your image, >Adjust your controlnet strength if needed and boom click generate> チェックポイントを選択してください (必要に応じて、別のスタイルに lora モデルを使用することもできます)> 画像をロードします> 必要に応じてコントロールネットの強度を調整し、「生成」をクリックします。

Multiple ControlNets

Flux Image to Image Upscale