⚗ Alchemica Attention Guidance (NAG / PAG / SEG)

Attention guidance for Krea 2: NAG (a negative prompt that works at cfg 1) and SEG/PAG (structure).

By Nessuno76·Created 18 days ago·Updated about 22 hours ago· 2

◄nag_scale3.0►

◄nag_tau2.5►

◄nag_alpha0.25►

◄nag_blocksall►

◄nag_sigma_start-1.00►

◄nag_sigma_end0.00►

◄structureoff►

◄structure_scale0.00►

◄structure_blocks8-19►

◄seg_blur10.0►

◄structure_sigma_start-1.00►

◄structure_sigma_end0.00►

Category⚗ AlchemicaMente/model_patches

Inputs (14)

Name	Type	Default	Description
model	MODEL		—
nag_scale	FLOAT	3.00–20	NAG: strength of the negative at cfg 1. 0 = off. Validated: 3 (the unwanted element disappears, image unchanged)
nag_tau	FLOAT	2.51–10	NAG: norm limit (how far it may move away from the positive)
nag_alpha	FLOAT	0.250–1	NAG: blend with the original attention
nag_blocks	STRING	all	DiT blocks (0-27): 'tutti' (all), '0-13', '5,8,10-12'
nag_sigma_start	FLOAT	-1.00-1–1	NAG active from this sigma downwards. 1.0 = from the start (may change the composition). -1 = from the profile's hand-off sigma (~0.87): removes the negative WITHOUT changing the composition
nag_sigma_end	FLOAT	0.000–1	NAG active down to this sigma
structure	COMBO	off	PAG = identity attention: crisper, more contrasty rendering (measured: scale 1 from -1, image unchanged, fewer freckles). SEG = blurred queries: halos above 0.3. Each costs 1 extra model call per step inside the window
structure_scale	FLOAT	0.00-5–10	Strength of the structure guidance. 0 = off
structure_blocks	STRING	8-19	—
seg_blur	FLOAT	10.00.5–1000	SEG: gaussian sigma in tokens (>=1000 = infinite)
structure_sigma_start	FLOAT	-1.00-1–1	Structure guidance window: from this sigma... (-1 = from the profile)
structure_sigma_end	FLOAT	0.000–1	...down to this one (costs only inside the window)
negativeopt	CONDITIONING		The negative for NAG (from the ⚗ Text node)

Name	Type	Description
model	MODEL	—
report	STRING	—