diff --git a/configs/birefnet.yaml b/configs/birefnet.yaml
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+++ b/configs/birefnet.yaml
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+# Same as default.yaml but with the BiRefNet segmentation backend instead of
+# anime-seg. BiRefNet is a general salient-object segmenter (not anime-specific),
+# so it can find subjects anime-seg misses. It ships custom modelling code, so it
+# needs trust_remote_code (handled in code) plus timm / einops / kornia, and the
+# first run downloads weights from HuggingFace (set HF_ENDPOINT behind a firewall).
+screen_color: null
+
+model:
+  model_name: hustvl/vitmatte-base-composition-1k
+  device: cuda
+  matting_method: vitmatte
+  fallback_to_chroma_alpha: false
+
+segmentation:
+  enabled: true
+  backend: birefnet
+  model_name: ZhengPeng7/BiRefNet
+  device: cuda
+  input_size: 1024
+
+trimap:
+  sure_bg_threshold: 0.92
+  sure_fg_threshold: 0.12
+  unknown_radius_ratio: 0.012
+  fg_safe_radius_ratio: 0.006
+  seg_core_threshold: 0.60
+  seg_loose_threshold: 0.08
+  mode: directional
+  seg_low: 0.15
+  bg_hue_proj_min: 4.0
+
+alpha_post:
+  chroma_suppress: true
+  chroma_suppress_bg_low: 0.35
+  chroma_suppress_bg_high: 0.80
+  chroma_suppress_strength: 1.0
+
+foreground:
+  enabled: true
+  method: ml
+  fallback_to_unmix: true
+  ml_regularization: 0.00001
+  edge_low: 0.005
+  edge_high: 0.995
+  min_unmix_alpha: 0.08
+  unmix_strength: 0.70
+  local_strength: 0.45
+  local_blur_radius: 11
+  local_alpha_threshold: 0.92
+  local_bg_confidence_max: 0.20
+  green_excess_margin: 0.015
+  bg_confidence_weight: 0.70
+
+despill:
+  enabled: true
+  edge_low: 0.005
+  strength: 0.92
+  green_excess_margin: 0.015
+  edge_expand_radius: 2
+  alpha_weight_floor: 0.35
+  color_margin_lab: 4.0