Z Image 4X UPSCALER by Helaman

Z Image 4X UPSCALER by Helaman {this is not LoRA.} 4x photo upscaler which handles jpg compression. This model will preserve noise. General upscaler: Realistic - Restoration Training details: AdamW optimizer with U-Net SN discriminator and BFloat16. Degraded with otf jpg compression down to 40, re-compression down to 40, together with resizes and the blur kernels. Losses: PixelLoss using CHC (Clipped Huber with Cosine Similarity Loss), PerceptualLoss using Huber, GANLoss, LDL using Huber, YCbCr Color Loss (bt601) and Luma Loss (CIE XYZ) on neosr .

ComfyUI/ └── models/ ├── upscale_models └── 4xZImageTurbo_upscaler_255.safetensors

CREDIT: https://github.com/Phhofm/models/releases/4xNomos8k_atd_jpg