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ComfyUI: Upscaling images using models

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Demo summary

Demonstrates upscaling a low-resolution 512x512 image using the 4X Ultra Sharp model to add clarity and detail.

Step-by-step

  1. Set the initial image width and height to 512x512.
  2. Right-click or drag out from the image node and search for 'Upscale Image (using Model)'.
  3. Drag out from the 'upscale_model' input and select 'Upscale Model Loader'.
  4. Select a model from the loader dropdown, such as '4x-UltraSharp' or 'RealESRGAN'.
  5. Connect a 'Preview Image' node to the output of the upscale node.
  6. Click 'Queue Prompt' to generate and upscale the image.

Options

  • Use 'Upscale Image By' for simple resizing without adding detail
  • Download 'RealESRGAN_x2' via the Model Manager if you only require a 2x increase instead of 4x

Watch out for

  • The 'Upscale Image (using Model)' node requires a separate 'Upscale Model Loader' node to function.
  • You must have upscale models downloaded in your models folder to see them in the loader.

Tips

  • Avoid using the 'Upscale Image By' method as it simply increases size without adding any new detail or clarity.
  • Use a 'Preview Image' node before the upscale node to compare the low-resolution original with the final result.
  • If using SDXL, remember that while 1024x1024 is the optimum dimension, starting at 512x512 is useful for demonstrating upscaler effectiveness.

Highlights

“you can see that the details are a lot sharper especially the patterns on his helmet and on his armor”

All demos from “Master AI image generation - ComfyUI FULL TUTORIAL”

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  2. 8:418:40Building a ComfyUI workflow from scratchA step-by-step walkthrough of adding nodes (Checkpoint, CLIP Text Encode, KSampler, VAE Decode) and connecting them to build a custom image generation pipeline.ComfyUIAI Image Generator
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  4. 25:330:32Importing workflows from image metadataShows how to drag an existing AI-generated image into the ComfyUI canvas to automatically reconstruct the entire node workflow used to create it.ComfyUIAI Image Generator
  5. 30:073:41Upscaling images using modelsCurrentDemonstrates upscaling a low-resolution 512x512 image using the 4X Ultra Sharp model to add clarity and detail.ComfyUIAI Image Upscaler
  6. 36:021:32Using Preview Chooser for selective upscalingShows how to use the Image Chooser node to generate a batch of images and selectively progress only one specific image to the upscaler.ComfyUIAI Image Upscaler
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  8. 43:496:52Tiled upscaling with Ultimate SD UpscaleA detailed demo of the Ultimate SD Upscale node, showing how tiled upscaling generates significantly higher facial detail than standard upscaling.ComfyUIAI Image Upscaler
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  12. Watch “Master AI image generation - ComfyUI FULL TUTORIAL” →

AI Image Upscaler

  1. 30:073:41Upscaling images using modelsCurrentDemonstrates upscaling a low-resolution 512x512 image using the 4X Ultra Sharp model to add clarity and detail.AI Search
  2. 36:021:32Using Preview Chooser for selective upscalingShows how to use the Image Chooser node to generate a batch of images and selectively progress only one specific image to the upscaler.AI Search
  3. 43:496:52Tiled upscaling with Ultimate SD UpscaleA detailed demo of the Ultimate SD Upscale node, showing how tiled upscaling generates significantly higher facial detail than standard upscaling.AI Search
  4. 2:432:38Generate and upscale images with Flux KontextThe creator demonstrates setting up a basic Flux Kontext workflow in ComfyUI, generating a character image, and then using a KSampler-based upscaler to increase resolution.pixaroma
  5. 9:521:53Upscale an existing image to 4K with PiDThe video demonstrates uploading a landscape photo into a ComfyUI workflow and using the PiD (Pixel Diffusion) model to upscale it to 4096 resolution in under 10 seconds.AI Search
  6. 13:200:38Compare original vs upscaled image using RG3 nodesThe user adds an 'image compare' node by RG3 to the ComfyUI canvas to show a side-by-side slider comparison of the blurry original image versus the sharp PiD upscaled result.AI Search
  7. 14:274:08Generate and upscale images using Zee Image and PiDA demonstration of a combined workflow where Zee Image Turbo generates a 1K image of a red panda which is then automatically passed into the PiD upscaler for a 4K final output.AI Search
  8. 1:491:28Simple non-AI image resizing in ComfyUIThe creator demonstrates a basic 'Upscale Image By' node that performs a standard resolution increase without AI, similar to Photoshop resizing, and uses an RG3 image comparer node to view the results.pixaroma
  9. 3:193:04Upscaling with Neural Network modelsThis clip shows how to use the 'Upscale Image (using Model)' node in ComfyUI with various PTH models like UltraSharp and 8x upscalers to sharpen and reconstruct details.pixaroma
  10. 6:233:22Tiled Diffusion upscaling with Zimage TurboThe creator walks through a complex workflow using Tiled Diffusion and the Zimage Turbo model to upscale images while managing VRAM by processing the image in smaller tiles.pixaroma
  11. 9:451:24Upscaling with Nunchaku Flux ManiaA demonstration of using a modified Flux.1 Dev model (Flux Mania) via Nunchaku nodes to perform a 2x upscale that enhances skin textures and fine details.pixaroma
  12. 11:103:10High-fidelity upscaling with SeedVR2The video shows the setup and execution of the SeedVR2 node pack, demonstrating how to select specific models and adjust resolution for sharp, consistent upscaling results.pixaroma
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