pk_hook.md

PK_HOOK (Pixel KSample Hook)

• PK_HOOK is used with PixelKSampleUpscaler for adjusting the settings according to the progress of the step during Iterative Upscale.

• Currently, the following three nodes are provided related to PK_HOOK.

  • DenoiseScheduleHookProvider: IterativeUpscale provides a hook that gradually changes the denoise to target_denoise as the step progresses.
  • CfgScheduleHookProvider: IterativeUpscale provides a hook that gradually changes the cfg to target_cfg as the step progresses.
  • PixelKSampleHookCombine: This is used to connect two PK_HOOKs. hook1 is executed first and then hook2 is executed.

• The workflow can be configured as follows:

  • One decreases denoise from 0.7 to 0.4 and increases cfg from 3 to 15 at the beginning.
  • The other increases denoise from 0.1 to 0.6 and decreases cfg from 25 to 3 at the beginning.

• The following is the result of applying the above workflow.

• The left one is the original, the middle one has denoise increased/cfg decreased applied, and the right one has denoise decreased/cfg increased applied.

• If you decrease the strength of denoise from high level denoise, initially the image may become distorted, but gradually it can be reconstructed into a new image.