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LAXMAYDAY
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krea2-scene-linear-hdr-dataset

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hdr
scene-linear
logc4
krea2
lora-training
ibl
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scene-linear HDR photo, Abandoned Parking, outdoor, with visible sun, parking, asphalt, road, tree, bush, skies, urban, midday, partly cloudy, high contrast, natural light, high dynamic range, physically based lighting
scene-linear HDR photo, Abandoned Parking, outdoor, with visible sun, parking, asphalt, road, tree, bush, skies, urban, midday, partly cloudy, high contrast, natural light, high dynamic range, physically based lighting
scene-linear HDR photo, Abandoned Parking, outdoor, with visible sun, parking, asphalt, road, tree, bush, skies, urban, midday, partly cloudy, high contrast, natural light, high dynamic range, physically based lighting
scene-linear HDR photo, Abandoned Parking, outdoor, with visible sun, parking, asphalt, road, tree, bush, skies, urban, midday, partly cloudy, high contrast, natural light, high dynamic range, physically based lighting
scene-linear HDR photo, Abandoned Parking, outdoor, with visible sun, parking, asphalt, road, tree, bush, skies, urban, midday, partly cloudy, high contrast, natural light, high dynamic range, physically based lighting
scene-linear HDR photo, Abandoned Parking, outdoor, with visible sun, parking, asphalt, road, tree, bush, skies, urban, midday, partly cloudy, high contrast, natural light, high dynamic range, physically based lighting
scene-linear HDR photo, Abandoned Parking, outdoor, with visible sun, parking, asphalt, road, tree, bush, skies, urban, midday, partly cloudy, high contrast, natural light, high dynamic range, physically based lighting
scene-linear HDR photo, Abandoned Parking, outdoor, with visible sun, parking, asphalt, road, tree, bush, skies, urban, midday, partly cloudy, high contrast, natural light, high dynamic range, physically based lighting
scene-linear HDR photo, Abandoned Slipway, outdoor, with visible sun, ocean, bay, lake, industrial, abandoned, urban, midday, overcast, low contrast, natural light, high dynamic range, physically based lighting
scene-linear HDR photo, Abandoned Slipway, outdoor, with visible sun, ocean, bay, lake, industrial, abandoned, urban, midday, overcast, low contrast, natural light, high dynamic range, physically based lighting
scene-linear HDR photo, Abandoned Slipway, outdoor, with visible sun, ocean, bay, lake, industrial, abandoned, urban, midday, overcast, low contrast, natural light, high dynamic range, physically based lighting
scene-linear HDR photo, Abandoned Slipway, outdoor, with visible sun, ocean, bay, lake, industrial, abandoned, urban, midday, overcast, low contrast, natural light, high dynamic range, physically based lighting
scene-linear HDR photo, Abandoned Slipway, outdoor, with visible sun, ocean, bay, lake, industrial, abandoned, urban, midday, overcast, low contrast, natural light, high dynamic range, physically based lighting
scene-linear HDR photo, Abandoned Slipway, outdoor, with visible sun, ocean, bay, lake, industrial, abandoned, urban, midday, overcast, low contrast, natural light, high dynamic range, physically based lighting
scene-linear HDR photo, Abandoned Slipway, outdoor, with visible sun, ocean, bay, lake, industrial, abandoned, urban, midday, overcast, low contrast, natural light, high dynamic range, physically based lighting
scene-linear HDR photo, Abandoned Slipway, outdoor, with visible sun, ocean, bay, lake, industrial, abandoned, urban, midday, overcast, low contrast, natural light, high dynamic range, physically based lighting
scene-linear HDR photo, Abandoned Tank Farm 03, outdoor, with visible sun, sun, parking, abandoned, asphalt, backplates, skies, urban, midday, partly cloudy, high contrast, natural light, high dynamic range, physically based lighting
scene-linear HDR photo, Abandoned Tank Farm 03, outdoor, with visible sun, sun, parking, abandoned, asphalt, backplates, skies, urban, midday, partly cloudy, high contrast, natural light, high dynamic range, physically based lighting
scene-linear HDR photo, Abandoned Tank Farm 03, outdoor, with visible sun, sun, parking, abandoned, asphalt, backplates, skies, urban, midday, partly cloudy, high contrast, natural light, high dynamic range, physically based lighting
scene-linear HDR photo, Abandoned Tank Farm 03, outdoor, with visible sun, sun, parking, abandoned, asphalt, backplates, skies, urban, midday, partly cloudy, high contrast, natural light, high dynamic range, physically based lighting
scene-linear HDR photo, Abandoned Tank Farm 03, outdoor, with visible sun, sun, parking, abandoned, asphalt, backplates, skies, urban, midday, partly cloudy, high contrast, natural light, high dynamic range, physically based lighting
scene-linear HDR photo, Abandoned Tank Farm 03, outdoor, with visible sun, sun, parking, abandoned, asphalt, backplates, skies, urban, midday, partly cloudy, high contrast, natural light, high dynamic range, physically based lighting
scene-linear HDR photo, Abandoned Tank Farm 03, outdoor, with visible sun, sun, parking, abandoned, asphalt, backplates, skies, urban, midday, partly cloudy, high contrast, natural light, high dynamic range, physically based lighting
scene-linear HDR photo, Abandoned Tank Farm 03, outdoor, with visible sun, sun, parking, abandoned, asphalt, backplates, skies, urban, midday, partly cloudy, high contrast, natural light, high dynamic range, physically based lighting
scene-linear HDR photo, Aft Lounge, indoor, with visible sun, lounge, chair, ship, stage, carpet, urban, sunrise-sunset, clear, high contrast, natural light, artificial light, high dynamic range, physically based lighting
scene-linear HDR photo, Aft Lounge, indoor, with visible sun, lounge, chair, ship, stage, carpet, urban, sunrise-sunset, clear, high contrast, natural light, artificial light, high dynamic range, physically based lighting
scene-linear HDR photo, Aft Lounge, indoor, with visible sun, lounge, chair, ship, stage, carpet, urban, sunrise-sunset, clear, high contrast, natural light, artificial light, high dynamic range, physically based lighting
scene-linear HDR photo, Aft Lounge, indoor, with visible sun, lounge, chair, ship, stage, carpet, urban, sunrise-sunset, clear, high contrast, natural light, artificial light, high dynamic range, physically based lighting
scene-linear HDR photo, Aft Lounge, indoor, with visible sun, lounge, chair, ship, stage, carpet, urban, sunrise-sunset, clear, high contrast, natural light, artificial light, high dynamic range, physically based lighting
scene-linear HDR photo, Aft Lounge, indoor, with visible sun, lounge, chair, ship, stage, carpet, urban, sunrise-sunset, clear, high contrast, natural light, artificial light, high dynamic range, physically based lighting
scene-linear HDR photo, Aft Lounge, indoor, with visible sun, lounge, chair, ship, stage, carpet, urban, sunrise-sunset, clear, high contrast, natural light, artificial light, high dynamic range, physically based lighting
scene-linear HDR photo, Aft Lounge, indoor, with visible sun, lounge, chair, ship, stage, carpet, urban, sunrise-sunset, clear, high contrast, natural light, artificial light, high dynamic range, physically based lighting
scene-linear HDR photo, Artist Workshop, indoor, with visible sun, painting, canvas, window, art, atelier, urban, midday, low contrast, natural light, high dynamic range, physically based lighting
scene-linear HDR photo, Artist Workshop, indoor, with visible sun, painting, canvas, window, art, atelier, urban, midday, low contrast, natural light, high dynamic range, physically based lighting
scene-linear HDR photo, Artist Workshop, indoor, with visible sun, painting, canvas, window, art, atelier, urban, midday, low contrast, natural light, high dynamic range, physically based lighting
scene-linear HDR photo, Artist Workshop, indoor, with visible sun, painting, canvas, window, art, atelier, urban, midday, low contrast, natural light, high dynamic range, physically based lighting
scene-linear HDR photo, Artist Workshop, indoor, with visible sun, painting, canvas, window, art, atelier, urban, midday, low contrast, natural light, high dynamic range, physically based lighting
scene-linear HDR photo, Artist Workshop, indoor, with visible sun, painting, canvas, window, art, atelier, urban, midday, low contrast, natural light, high dynamic range, physically based lighting
scene-linear HDR photo, Artist Workshop, indoor, with visible sun, painting, canvas, window, art, atelier, urban, midday, low contrast, natural light, high dynamic range, physically based lighting
scene-linear HDR photo, Artist Workshop, indoor, with visible sun, painting, canvas, window, art, atelier, urban, midday, low contrast, natural light, high dynamic range, physically based lighting
scene-linear HDR photo, Beach Parking, outdoor, road, parking, fog, backplates, skies, urban, sunrise-sunset, overcast, low contrast, natural light, high dynamic range, physically based lighting
scene-linear HDR photo, Beach Parking, outdoor, road, parking, fog, backplates, skies, urban, sunrise-sunset, overcast, low contrast, natural light, high dynamic range, physically based lighting
scene-linear HDR photo, Beach Parking, outdoor, road, parking, fog, backplates, skies, urban, sunrise-sunset, overcast, low contrast, natural light, high dynamic range, physically based lighting
scene-linear HDR photo, Beach Parking, outdoor, road, parking, fog, backplates, skies, urban, sunrise-sunset, overcast, low contrast, natural light, high dynamic range, physically based lighting
scene-linear HDR photo, Beach Parking, outdoor, road, parking, fog, backplates, skies, urban, sunrise-sunset, overcast, low contrast, natural light, high dynamic range, physically based lighting
scene-linear HDR photo, Beach Parking, outdoor, road, parking, fog, backplates, skies, urban, sunrise-sunset, overcast, low contrast, natural light, high dynamic range, physically based lighting
scene-linear HDR photo, Beach Parking, outdoor, road, parking, fog, backplates, skies, urban, sunrise-sunset, overcast, low contrast, natural light, high dynamic range, physically based lighting
scene-linear HDR photo, Beach Parking, outdoor, road, parking, fog, backplates, skies, urban, sunrise-sunset, overcast, low contrast, natural light, high dynamic range, physically based lighting
scene-linear HDR photo, Blue Photo Studio, indoor, with visible sun, couch, wooden floor, lamp, window, seat, studio, artificial light, natural light, urban, medium contrast, midday, high dynamic range, physically based lighting
scene-linear HDR photo, Blue Photo Studio, indoor, with visible sun, couch, wooden floor, lamp, window, seat, studio, artificial light, natural light, urban, medium contrast, midday, high dynamic range, physically based lighting
scene-linear HDR photo, Blue Photo Studio, indoor, with visible sun, couch, wooden floor, lamp, window, seat, studio, artificial light, natural light, urban, medium contrast, midday, high dynamic range, physically based lighting
scene-linear HDR photo, Blue Photo Studio, indoor, with visible sun, couch, wooden floor, lamp, window, seat, studio, artificial light, natural light, urban, medium contrast, midday, high dynamic range, physically based lighting
scene-linear HDR photo, Blue Photo Studio, indoor, with visible sun, couch, wooden floor, lamp, window, seat, studio, artificial light, natural light, urban, medium contrast, midday, high dynamic range, physically based lighting
scene-linear HDR photo, Blue Photo Studio, indoor, with visible sun, couch, wooden floor, lamp, window, seat, studio, artificial light, natural light, urban, medium contrast, midday, high dynamic range, physically based lighting
scene-linear HDR photo, Blue Photo Studio, indoor, with visible sun, couch, wooden floor, lamp, window, seat, studio, artificial light, natural light, urban, medium contrast, midday, high dynamic range, physically based lighting
scene-linear HDR photo, Blue Photo Studio, indoor, with visible sun, couch, wooden floor, lamp, window, seat, studio, artificial light, natural light, urban, medium contrast, midday, high dynamic range, physically based lighting
scene-linear HDR photo, Brown Photostudio 04, indoor, with visible sun, studio, couch, bed, window, table, studio, natural light, urban, midday, low contrast, high dynamic range, physically based lighting
scene-linear HDR photo, Brown Photostudio 04, indoor, with visible sun, studio, couch, bed, window, table, studio, natural light, urban, midday, low contrast, high dynamic range, physically based lighting
scene-linear HDR photo, Brown Photostudio 04, indoor, with visible sun, studio, couch, bed, window, table, studio, natural light, urban, midday, low contrast, high dynamic range, physically based lighting
scene-linear HDR photo, Brown Photostudio 04, indoor, with visible sun, studio, couch, bed, window, table, studio, natural light, urban, midday, low contrast, high dynamic range, physically based lighting
scene-linear HDR photo, Brown Photostudio 04, indoor, with visible sun, studio, couch, bed, window, table, studio, natural light, urban, midday, low contrast, high dynamic range, physically based lighting
scene-linear HDR photo, Brown Photostudio 04, indoor, with visible sun, studio, couch, bed, window, table, studio, natural light, urban, midday, low contrast, high dynamic range, physically based lighting
scene-linear HDR photo, Brown Photostudio 04, indoor, with visible sun, studio, couch, bed, window, table, studio, natural light, urban, midday, low contrast, high dynamic range, physically based lighting
scene-linear HDR photo, Brown Photostudio 04, indoor, with visible sun, studio, couch, bed, window, table, studio, natural light, urban, midday, low contrast, high dynamic range, physically based lighting
scene-linear HDR photo, Cayley Interior, indoor, lamp, table, window, glass, balcony, urban, sunrise-sunset, artificial light, natural light, high contrast, high dynamic range, physically based lighting
scene-linear HDR photo, Cayley Interior, indoor, lamp, table, window, glass, balcony, urban, sunrise-sunset, artificial light, natural light, high contrast, high dynamic range, physically based lighting
scene-linear HDR photo, Cayley Interior, indoor, lamp, table, window, glass, balcony, urban, sunrise-sunset, artificial light, natural light, high contrast, high dynamic range, physically based lighting
scene-linear HDR photo, Cayley Interior, indoor, lamp, table, window, glass, balcony, urban, sunrise-sunset, artificial light, natural light, high contrast, high dynamic range, physically based lighting
scene-linear HDR photo, Cayley Interior, indoor, lamp, table, window, glass, balcony, urban, sunrise-sunset, artificial light, natural light, high contrast, high dynamic range, physically based lighting
scene-linear HDR photo, Cayley Interior, indoor, lamp, table, window, glass, balcony, urban, sunrise-sunset, artificial light, natural light, high contrast, high dynamic range, physically based lighting
scene-linear HDR photo, Cayley Interior, indoor, lamp, table, window, glass, balcony, urban, sunrise-sunset, artificial light, natural light, high contrast, high dynamic range, physically based lighting
scene-linear HDR photo, Cayley Interior, indoor, lamp, table, window, glass, balcony, urban, sunrise-sunset, artificial light, natural light, high contrast, high dynamic range, physically based lighting
scene-linear HDR photo, Cedar Bridge, outdoor, road, storm, path, rail, overpass, skies, urban, partly cloudy, morning-afternoon, low contrast, natural light, high dynamic range, physically based lighting
scene-linear HDR photo, Cedar Bridge, outdoor, road, storm, path, rail, overpass, skies, urban, partly cloudy, morning-afternoon, low contrast, natural light, high dynamic range, physically based lighting
scene-linear HDR photo, Cedar Bridge, outdoor, road, storm, path, rail, overpass, skies, urban, partly cloudy, morning-afternoon, low contrast, natural light, high dynamic range, physically based lighting
scene-linear HDR photo, Cedar Bridge, outdoor, road, storm, path, rail, overpass, skies, urban, partly cloudy, morning-afternoon, low contrast, natural light, high dynamic range, physically based lighting
scene-linear HDR photo, Cedar Bridge, outdoor, road, storm, path, rail, overpass, skies, urban, partly cloudy, morning-afternoon, low contrast, natural light, high dynamic range, physically based lighting
scene-linear HDR photo, Cedar Bridge, outdoor, road, storm, path, rail, overpass, skies, urban, partly cloudy, morning-afternoon, low contrast, natural light, high dynamic range, physically based lighting
scene-linear HDR photo, Cedar Bridge, outdoor, road, storm, path, rail, overpass, skies, urban, partly cloudy, morning-afternoon, low contrast, natural light, high dynamic range, physically based lighting
scene-linear HDR photo, Cedar Bridge, outdoor, road, storm, path, rail, overpass, skies, urban, partly cloudy, morning-afternoon, low contrast, natural light, high dynamic range, physically based lighting
scene-linear HDR photo, Cobblestone Street Night, outdoor, with visible sun, city, street, cobblestone, dark, lamp, night, urban, artificial light, high contrast, clear, high dynamic range, physically based lighting
scene-linear HDR photo, Cobblestone Street Night, outdoor, with visible sun, city, street, cobblestone, dark, lamp, night, urban, artificial light, high contrast, clear, high dynamic range, physically based lighting
scene-linear HDR photo, Cobblestone Street Night, outdoor, with visible sun, city, street, cobblestone, dark, lamp, night, urban, artificial light, high contrast, clear, high dynamic range, physically based lighting
scene-linear HDR photo, Cobblestone Street Night, outdoor, with visible sun, city, street, cobblestone, dark, lamp, night, urban, artificial light, high contrast, clear, high dynamic range, physically based lighting
scene-linear HDR photo, Cobblestone Street Night, outdoor, with visible sun, city, street, cobblestone, dark, lamp, night, urban, artificial light, high contrast, clear, high dynamic range, physically based lighting
scene-linear HDR photo, Cobblestone Street Night, outdoor, with visible sun, city, street, cobblestone, dark, lamp, night, urban, artificial light, high contrast, clear, high dynamic range, physically based lighting
scene-linear HDR photo, Cobblestone Street Night, outdoor, with visible sun, city, street, cobblestone, dark, lamp, night, urban, artificial light, high contrast, clear, high dynamic range, physically based lighting
scene-linear HDR photo, Cobblestone Street Night, outdoor, with visible sun, city, street, cobblestone, dark, lamp, night, urban, artificial light, high contrast, clear, high dynamic range, physically based lighting
scene-linear HDR photo, Courtyard Night, outdoor, with visible sun, brick, house, moon, lamp, urban, night, clear, high contrast, artificial light, high dynamic range, physically based lighting
scene-linear HDR photo, Courtyard Night, outdoor, with visible sun, brick, house, moon, lamp, urban, night, clear, high contrast, artificial light, high dynamic range, physically based lighting
scene-linear HDR photo, Courtyard Night, outdoor, with visible sun, brick, house, moon, lamp, urban, night, clear, high contrast, artificial light, high dynamic range, physically based lighting
scene-linear HDR photo, Courtyard Night, outdoor, with visible sun, brick, house, moon, lamp, urban, night, clear, high contrast, artificial light, high dynamic range, physically based lighting
scene-linear HDR photo, Courtyard Night, outdoor, with visible sun, brick, house, moon, lamp, urban, night, clear, high contrast, artificial light, high dynamic range, physically based lighting
scene-linear HDR photo, Courtyard Night, outdoor, with visible sun, brick, house, moon, lamp, urban, night, clear, high contrast, artificial light, high dynamic range, physically based lighting
scene-linear HDR photo, Courtyard Night, outdoor, with visible sun, brick, house, moon, lamp, urban, night, clear, high contrast, artificial light, high dynamic range, physically based lighting
scene-linear HDR photo, Courtyard Night, outdoor, with visible sun, brick, house, moon, lamp, urban, night, clear, high contrast, artificial light, high dynamic range, physically based lighting
scene-linear HDR photo, Crosswalk, outdoor, with visible sun, road, sun, pedetrian, asphalt, backplates, urban, morning-afternoon, clear, high contrast, natural light, high dynamic range, physically based lighting
scene-linear HDR photo, Crosswalk, outdoor, with visible sun, road, sun, pedetrian, asphalt, backplates, urban, morning-afternoon, clear, high contrast, natural light, high dynamic range, physically based lighting
scene-linear HDR photo, Crosswalk, outdoor, with visible sun, road, sun, pedetrian, asphalt, backplates, urban, morning-afternoon, clear, high contrast, natural light, high dynamic range, physically based lighting
scene-linear HDR photo, Crosswalk, outdoor, with visible sun, road, sun, pedetrian, asphalt, backplates, urban, morning-afternoon, clear, high contrast, natural light, high dynamic range, physically based lighting
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Krea 2 scene-linear HDR — LogC4 training dataset

320 scene-linear HDR training images for the Krea 2 HDR LoRA (see model: LAXMAYDAY/krea2-scene-linear-hdr-lora · tools: krea2-hdr-toolkit).

Built by re-projecting CC0 Poly Haven HDRIs into normal perspective scene images, exposure-normalizing (mid-gray → 0.18), and LogC4-encoding to [0,1] so a wide scene-linear range is carried through an ordinary 8-bit pipeline.

What each sample is

  • images/<slug>__v<k>.png — an 8-bit RGB PNG holding the LogC4 code. It looks flat/ grey (normal for log footage); the HDR lives in the encoding. Recover scene-linear radiance with inverse-LogC4 (code 1.0 → ~470× mid-gray).
  • images/<slug>__v<k>.txt — caption (trigger phrase scene-linear HDR, high dynamic range, physically based lighting).
  • manifest.jsonl — one row per image: encoding (LogC4), anchor (0.18), exposure_scale, crop yaw/pitch/fov, and decoded HDR stats (hdr_peak, hdr_stops, frac_gt1).
  • manifest_hdr_rich.jsonl — the recommended training subset (229 crops with source peak > 2× and ≥ 3 stops). Train on this.

Decode to scene-linear (EXR) 

import numpy as np, imageio.v2 as iio
_A=(2**18-16)/117.45; _B=(1023-95)/1023; _C=95/1023
import math
_S=(7*math.log(2)*2**(7-14*_C/_B))/(_A*_B); _T=(2**(14*(-_C/_B)+6)-64)/_A
def logc4_to_linear(V):            # V in [0,1] -> scene-linear (>>1 for highlights)
    V=np.asarray(V,np.float64)
    return np.where(V>=_C,(2.0**(14*(V-_C)/_B+6)-64)/_A, V*_S+_T)
lin = logc4_to_linear(iio.imread("images/....png").astype(np.float64)/255.0)  # scene-linear HDR

(the toolkit's decode_to_exr.py writes this straight to 32-bit EXR.)

Verified

93% of images decode to real HDR (peak > 1.0). Same PNG read naively as SDR peaks at 1.0; read correctly via inverse-LogC4 it reaches ~470×. The HDR is in the file, log-encoded.

Notes & limits

  • 8-bit is precision, not range: 256 log-spaced codes cover 0–470× (~17 codes/stop). The frozen VAE is ~8-bit effective anyway, so 8-bit LogC4 is adequate.
  • Single-plane LogC4 caps peak radiance ~470×; the sun disk clips (true sun magnitude needs a multi-plane scheme). ~9% of crops are genuinely low-DR (overcast) — excluded by the hdr-rich manifest.
  • Source HDRIs are Poly Haven (CC0); this dataset is released CC0.
  • Caption caveat: some "visible sun" captions sit on crops where the sun is out of frame (a cropping artifact documented in the project report).
Downloads last month
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Number of rows:
320
Total file size:
127 MB