Upscaler?

[mr-september]

In the A1111 Tiled Diffusion extension, there's an option for selecting an upscaler (e.g. ESRGAN). I can't seem to find that in this ComfyUI extension. Does it exist? Or is done with other workarounds?

[Adreitz]

You will need a series of nodes for this. After your initial generation, you will need a normal VAE Decode node. You should then feed the image into an Upscale Image (using Model) node and use a Load Upscale Model node to choose which model you want to use. If the model upscales to a factor other than the one you want to use (for example, I use 4xUltraSharp, but want 3x the initial image generations) feed the upscaled output into an Upscale Image By node using Lanczos method and set the factor based on the ratio between the model's factor and your desired factor -- in my case, 0.75. Then re-encode the upscaled image using the VAE Encode (Tiled) node to avoid going out of memory. You can then send the latent to your tiled diffusion step.