PixaromaNodes Explained
All Nodes Explained videos
Video coming soon
Goes live, Romania timeThursday 12 November, 18:00The practice workflows are ready now, so you can download them before it starts.
Video 4

ComfyUI KSampler Explained: Seed, Steps, CFG and Denoise

What every KSampler setting does: the seed and control after generate, steps, CFG, the sampler and scheduler, and denoise, why a new KSampler gives a flat, harsh image, and how to take the settings from your model's recipe, with four deeper looks. Plus Seed Pixaroma and XY Plot Pixaroma. Made with Z-Image Turbo.

Practice workflowHomework: do the tasksFinished workflowThe answer, to check your workPixaroma versionUses the free Pixaroma nodes

To open one: drag the .json file onto ComfyUI, or use Workflow > Open. The Pixaroma version needs the free Pixaroma nodes. New to ComfyUI? Install it first.

Watch on YouTubeThe whole playlist

Practice tasks

The same tasks as the notes in the Practice workflow.

  1. 1

    Fix it

    A new KSampler

    The KSampler still has the settings of a new KSampler: steps 20 and cfg 8. Press Run.
    Then set steps to 8 and cfg to 1, the Z-Image Turbo recipe, and press Run again.

    You know it worked when the flat, broken image turns back into the soft 3D panda.

  2. 2

    Experiment

    The seed modes

    Set control after generate to randomize, and press Run two times. Watch the seed number.
    Then set it back to fixed.

    You know it worked when the number changes after each Run on randomize, and stays the same on fixed. The image you see was made with the number shown before that Run.

  3. 3

    Experiment

    Steps

    Set steps to 4, press Run, then try 12 and press Run. Set it back to 8.

    You know it worked when 4 looks a little softer, and 12 takes longer without looking better than 8.

  4. 4

    Experiment

    CFG

    Set cfg to 3, and press Run. Then set it back to 1.

    You know it worked when the image turns flat and harsh at 3: Z-Image Turbo is made for cfg 1.

  5. 5

    Experiment

    Denoise

    Set denoise to 0.5, and press Run. Then set it back to 1.

    You know it worked when the image turns grey and muddy at 0.5: an empty latent has nothing to keep, so denoise stays at 1 in text to image.

  6. 6

    Save

    Your workflow

    Press Ctrl + S, type a name like My KSampler practice, and press Enter.

    You know it worked when your workflow shows in the Workflows panel on the left.

Models

Download each file and put it in its folder.

Model fileSizePut it inDownload
Diffusion model pick onez_image_turbo_int8_convrot.safetensorsint8, the one used in the video6.2 GB
ComfyUI/models/diffusion_models/z-image
Hugging Face
Diffusion model pick onez_image_turbo_bf16.safetensorsbf16, full detail, needs more video memory12.3 GB
ComfyUI/models/diffusion_models/z-image
Hugging Face
Diffusion model pick onez_image_turbo_nvfp4.safetensorsnvfp4, for RTX 50 cards4.5 GB
ComfyUI/models/diffusion_models/z-image
Hugging Face
Text encoder pick oneqwen_3_4b_fp8_mixed.safetensorsfp8, the one used in the video5.6 GB
ComfyUI/models/text_encoders
Hugging Face
Text encoder pick oneqwen_3_4b.safetensorsfull detail8.0 GB
ComfyUI/models/text_encoders
Hugging Face
VAEae.safetensors0.3 GB
ComfyUI/models/vae
Hugging Face
Checkpoint (optional, Task 4)z-image-turbo-fp8-aio.safetensorsall three parts in one file10.3 GB
ComfyUI/models/checkpoints
Hugging Face

After the download, press R in ComfyUI (or restart it), so the new files show up in the loaders.

Z-Image Turbo is free (Apache 2.0). The Comfy-Org files download without an account.

Chapters

Click a time to jump there on YouTube.

  1. Intro
  2. What the KSampler Does
  3. Every Model Has a Recipe
  4. Seed
  5. A Deeper Look: Seed
  6. Steps
  7. A Deeper Look: Steps
  8. CFG
  9. A Deeper Look: CFG
  10. Sampler and Scheduler
  11. A Deeper Look: Sampler and Scheduler
  12. Denoise
  13. An Easier Way: Seed Pixaroma
  14. Compare Settings: XY Plot Pixaroma
  15. Your Turn
  16. Quick Recap
  17. Thank You, Legends