ComfyUI: Managing seeds and randomization
ComfyUIDemo summary
Shows the difference between 'Randomize' and 'Fixed' seed settings in the KSampler to either generate new variations or reproduce the same image.
Step-by-step
- Locate the KSampler node in your workflow
- Set the seed control to 'randomize' to generate a new image variation with every run
- Set the seed control to 'fixed' to reproduce the exact same image consistently
- Manually enter a specific seed number to return to a previously generated result
- Adjust other settings like steps or CFG while keeping the seed 'fixed' to see how those specific parameters affect the image
Options
- Change the prompt while keeping the seed fixed to see variations on a specific composition
Watch out for
- Changing the prompt text, even on a fixed seed, will often result in a completely different image composition
Tips
- Keep the seed set to 'randomize' most of the time unless you are trying to retrace your steps
- Don't hunt for 'the best seed' as no seed is inherently better than another; it is simply down to randomness for your specific prompt
- Use a fixed seed when you want to isolate and test the impact of changing settings like steps, CFG, or ControlNet
All demos from “How to use ComfyUI for beginners.”
- 1:360:57Install custom workflows and missing nodes in ComfyUIThe video demonstrates how to drag and drop a JSON workflow file into ComfyUI and use the Manager to identify and install missing custom nodes.ComfyUI· AI Image Generator
- 3:020:20Search and install models via Model ManagerA walkthrough of using the ComfyUI Model Manager to search for specific AI models, such as ControlNet, and install them directly.ComfyUI· AI Image Generator
- 3:281:10Running and managing image generation queuesDemonstration of starting a workflow using the 'Run' button, setting up 'Run Instant' for continuous generation, and using 'Run on Change' to trigger generation upon prompt edits.ComfyUI· AI Image Generator
- 4:590:55Navigating the ComfyUI workspace and UI settingsShows how to use zoom, fit view, pan modes, and toggle link visibility or themes (light/dark mode) within the ComfyUI interface.ComfyUI· AI Image Generator
- 11:311:49Adding and connecting nodes in ComfyUIThe video demonstrates adding a 'Load Image' node via the library or right-click menu and connecting it to other nodes like 'Save Image' using spaghetti links.ComfyUI· AI Image Generator
- 19:431:34Converting widgets to inputs in ComfyUIShows how to convert a node's internal settings (like seed) into an external input pin and connect a 'Primitive' node to control it.ComfyUI· AI Image Generator
- 22:350:32Generating an image with Flux modelDemonstrates a text-to-image generation using the Flux model in ComfyUI, including prompt entry and resolving connection errors.ComfyUI· Text to Image
- 25:032:06Managing seeds and randomizationCurrentShows the difference between 'Randomize' and 'Fixed' seed settings in the KSampler to either generate new variations or reproduce the same image.ComfyUI· AI Image Generator
- 32:382:30Image-to-Image generation using DenoiseDemonstrates how the Denoise slider in the KSampler affects the transformation of a source image (cat) into a new subject (dog) based on a prompt.ComfyUI· Image to Image
- 36:450:34Saving images to specific foldersShows how to use the 'Save Image' node and file path syntax to organize output images into custom subfolders.ComfyUI· AI Image Generator
- Watch “How to use ComfyUI for beginners.” →
AI Image Generator
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.AI Search- 19:571:09Generating a medieval warrior with batch processingDemonstrates generating multiple images of a medieval warrior by increasing the batch size in the Empty Latent Image node.AI Search
- 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.AI Search
- 58:094:05Controlling character poses with ControlNetDemonstrates using the OpenPose pre-processor and ControlNet Union model to force a generated princess character into a specific pose from a reference image.AI Search
- 1:360:57Install custom workflows and missing nodes in ComfyUIThe video demonstrates how to drag and drop a JSON workflow file into ComfyUI and use the Manager to identify and install missing custom nodes.Sebastian Kamph
- 3:020:20Search and install models via Model ManagerA walkthrough of using the ComfyUI Model Manager to search for specific AI models, such as ControlNet, and install them directly.Sebastian Kamph
- 3:281:10Running and managing image generation queuesDemonstration of starting a workflow using the 'Run' button, setting up 'Run Instant' for continuous generation, and using 'Run on Change' to trigger generation upon prompt edits.Sebastian Kamph
- 4:590:55Navigating the ComfyUI workspace and UI settingsShows how to use zoom, fit view, pan modes, and toggle link visibility or themes (light/dark mode) within the ComfyUI interface.Sebastian Kamph
- 11:311:49Adding and connecting nodes in ComfyUIThe video demonstrates adding a 'Load Image' node via the library or right-click menu and connecting it to other nodes like 'Save Image' using spaghetti links.Sebastian Kamph
- 19:431:34Converting widgets to inputs in ComfyUIShows how to convert a node's internal settings (like seed) into an external input pin and connect a 'Primitive' node to control it.Sebastian Kamph
- 25:032:06Managing seeds and randomizationCurrentShows the difference between 'Randomize' and 'Fixed' seed settings in the KSampler to either generate new variations or reproduce the same image.Sebastian Kamph
- 36:450:34Saving images to specific foldersShows how to use the 'Save Image' node and file path syntax to organize output images into custom subfolders.Sebastian Kamph