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Simple non-AI image resizing in ComfyUI

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Demo summary

The 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.

Step-by-step

  1. Load an image into the Load Image node
  2. Add an Upscale Image By node
  3. Set the upscale factor (e.g., 4)
  4. Connect the image to an Image Comparer node
  5. Run the workflow to generate the resized image

Options

  • Use the built-in ComfyUI image comparer (requires Nodes 2 version enabled)
  • Install the RG3 custom node via the Manager for the specific image comparer shown

Watch out for

  • The built-in ComfyUI image comparer will not work if Nodes 2 version is turned off
  • This method does not add extra details or fix image artifacts

Tips

  • Use this method for a fast 2-3 second resize when AI enhancement is not required
  • Search for 'RG3' in the Custom Nodes Manager to find the specific comparer used in the demo

Highlights

“This is a simple upscale which doesn't use AI. It's something similar to a Photoshop or resize.”

All demos from “How to Upscale Images in ComfyUI (Ep05)”

  1. 1:491:28Simple non-AI image resizing in ComfyUICurrentThe 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.ComfyUIAI Image Upscaler
  2. 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.ComfyUIAI Image Upscaler
  3. 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.ComfyUIAI Image Upscaler
  4. 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.ComfyUIAI Image Upscaler
  5. 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.ComfyUIAI Image Upscaler
  6. 14:271:304K upscaling with Nano Banana Pro APIThe creator demonstrates using the paid Nano Banana Pro node to achieve 4K resolution upscaling through an external API, showing the significant detail improvement in the final result.ComfyUIAI Image Upscaler
  7. 15:570:46Creative upscaling with Recraft modelThis clip shows the Recraft node in action, which performs a 'creative upscale' to generate clean, realistic variations of an image with added textures.ComfyUIAI Image Upscaler
  8. Watch “How to Upscale Images in ComfyUI (Ep05)” →

AI Image Upscaler

  1. 30:073:41Upscaling images using modelsDemonstrates 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 ComfyUICurrentThe 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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