Flux Controlnet Upscale

Flux Controlnet Upscale is a Flux.1 D workflow for upscaling a provided image: it uses Flux Upscale Controlnet and Florence 2, which captions the image for automatic prompting, and produces an upscaled image.

Input: a provided image. Output: an upscaled image.

The output image size follows the input image’s aspect ratio and the value in the Scale To Megapixels node.

Install Flux VAE with the manager before use.

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The FP8 ControlNet conversion is intended to let Flux FP8 and the ControlNet fit within 16 GB of VRAM.

Named model files include ae.safetensors; flux1-dev-fp8-e4m3fb.safetensors; flux1-dev-fp8-e4m3fn.safetensors; Flux.1-dev-Controlnet-Upscaler_fp8.safetensors; t5xxl_fp8_e4m3fn_scaled.safetensors; and ViT-L-14-BEST-smooth-GmP-TE-only-HF-format.safetensors.

Other named models are Flux.1-dev-Controlnet-Upscaler, Flux VAE, and microsoft/Florence-2-base.

Named workflow nodes include CLIPTextEncode; ColorMatch; ConditioningZeroOut; ControlNetApplyAdvanced; ControlNetLoader; Display Any (rgthree); DownloadAndLoadFlorence2Model; DualCLIPLoader; EmptyLatentImage; Florence2Run; FluxGuidance; GetImageSizeAndCount; ImageScaleToMegapixel

Set Scale To Megapixels between 1 and 2; output size follows this setting and the input image’s aspect ratio.

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Set ControlNet strength between 0.5 and 0.6.

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Use end_percent to adjust fidelity: higher values keep the upscale closer to the original, while lower values leave more room for model creativity.

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For an image that is not a photo, bypass the Text Find and Replace node.

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