Jorijn van der Graaf
a5e3d1626c
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Raw-RDI dark frames (phone face-down, minimum analogue gain) put the pedestal at exactly 64 in 10-bit (mean 63.98, median 64, p1/p99 63/65) = 4096 on the 16-bit scale. The softISP's dynamic estimate ran at 48; the 16-code residual was amplified by the CCM into colour casts in dark image regions. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
52 lines
2.2 KiB
YAML
52 lines
2.2 KiB
YAML
# libcamera softISP tuning for the Fairphone 6 main camera (Sony IMX896).
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#
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# CCMs extracted from the FP6 stock Android tuning blob
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# com.qti.tuned.fp6_tsp_imx896.bin (vendor_a.img, sha256 0500766f...c1a5d29f),
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# CamX cc13_ope_v2 module, tree root at 0x2709fe: 3 lux zones, 3-5 CCT
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# regions each, offsets all zero, rows sum to 1.0. This file carries the
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# BRIGHT zone (lux-index trigger 1-200) — the true-color tuning, same
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# convention as the sibling ov13b10.yaml. Note the bright zone has only
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# three CT nodes and merges D50/D65 into one 4800-6700 K region (node
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# placed at its 5750 K midpoint); the lowlight zone has proper 5000/6500 K
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# nodes but at reduced saturation (chroma-noise hiding) — see
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# chromatix/imx896-ccm-awb-extracted.txt for all 12 matrices.
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# CT nodes = the chromatix CCT trigger midpoints: 2800 (A), 4000 (TL84),
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# 5750 (merged D50/D65 region).
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#
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# blackLevel: measured on the FP6 2026-08-17 (raw RDI dark frames, phone
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# face-down, min analogue gain): 10-bit pedestal 64.0 exact (mean 63.98,
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# median 64, p1/p99 63/65) -> 4096 on the 16-bit scale. The softISP's
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# dynamic estimate ran at 48, leaving a 16-code residual the CCM amplified
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# into colour casts in dark regions.
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#
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# PROVENANCE / LICENSE: the matrices are numeric calibration data read out
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# of the proprietary vendor blob (measured spectral response of this
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# sensor, not authored expression). Shipping decided 2026-08-17 by the
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# project owner, consistent with existing practice in this image; NOT
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# marked CC0. Durable replacement: measure our own matrices from a colour
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# chart with libcamera's tuning tooling.
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%YAML 1.1
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---
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version: 1
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algorithms:
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- BlackLevel:
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blackLevel: 4096
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- Awb:
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- Ccm:
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ccms:
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- ct: 2800
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ccm: [ 1.593410, -0.552769, -0.040641,
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-0.166429, 1.170414, -0.003985,
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0.004114, -0.855526, 1.851411 ]
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- ct: 4000
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ccm: [ 1.612519, -0.785270, 0.172751,
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-0.110672, 1.189965, -0.079293,
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0.091939, -0.965137, 1.873197 ]
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- ct: 5750
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ccm: [ 1.900000, -0.581250, -0.318750,
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-0.292500, 1.778126, -0.485626,
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0.014573, -0.734843, 1.720270 ]
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- Adjust:
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- Agc:
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- Af:
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...
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