hist hacking
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/* @(#) Various functions relating to tone curve adjustment.
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/* Various functions relating to tone curve adjustment.
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* @(#)
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* @(#) im_tone_build: generate tone curve for adjustment of LabQ image. LUT we
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* @(#) make is always 1024 elements, each element is a LabS L value.
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* @(#)
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* @(#) Base parameters:
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* @(#)
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* @(#) Lb - black point
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* @(#) Lw - white point (both [0,100])
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* @(#)
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* @(#) Ps - shadow point
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* @(#) Pm - mid-tone point
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* @(#) Ph - highlight point
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* @(#)
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* @(#) All 0-1, meaning max of shadow section of curve should be positioned
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* @(#) at Lb+Ps(Lw-Lb), etc. Suggest Lb, Lw should be set by histogram
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* @(#) analysis to 0.1% and 99.9%; Ps, Pm, Ph should be 0.2, 0.5, 0.8.
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* @(#)
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* @(#) Main parameters:
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* @(#)
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* @(#) S - shadow adjustment factor (+/- 30)
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* @(#) M - mid-tone adjustment factor (+/- 30)
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* @(#) H - highlight adjustment factor (+/- 30)
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* @(#)
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* @(#) Usage:
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* @(#)
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* @(#) int
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* @(#) im_tone_build(
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* @(#) IMAGE *lut,
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* @(#) double Lb, double Lw,
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* @(#) double Ps, double Pm, double Ph,
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* @(#) double S, double M, double H )
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* @(#)
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* @(#) Returns 0 on success and -1 on error
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* @(#)
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* @(#) im_tone_map: map just the L channel of a LabQ or LabS image through
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* @(#) a LUT.
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* @(#)
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* @(#) Usage:
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* @(#)
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* @(#) int
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* @(#) im_tone_map( IMAGE *in, IMAGE *out, IMAGE *lut )
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* @(#)
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* @(#) Returns 0 on success and -1 on error
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* @(#)
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* @(#) im_tone_analyse: find the histogram of a LabS or LabQ image and use
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* @(#) that to set the Ln and Lw parameters of im_tone_build()
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* @(#)
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* @(#) Usage:
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* @(#)
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* @(#) int
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* @(#) im_tone_analyse(
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* @(#) IMAGE *in,
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* @(#) IMAGE *lut,
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* @(#) double Ps, double Pm, double Ph,
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* @(#) double S, double M, double H )
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* @(#)
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* @(#) Returns 0 on success and -1 on error
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* @(#)
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*
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*
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* Author: John Cupitt
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* Author: John Cupitt
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* Written on: 18/7/1995
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* Written on: 18/7/1995
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@ -68,6 +10,9 @@
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* 11/7/04
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* 11/7/04
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* - generalised to im_tone_build_range() ... so you can use it for any
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* - generalised to im_tone_build_range() ... so you can use it for any
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* image, not just LabS
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* image, not just LabS
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* 26/3/10
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* - cleanups
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* - gtkdoc
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*/
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*/
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/*
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/*
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@ -483,6 +428,8 @@ im_tone_map( IMAGE *in, IMAGE *out, IMAGE *lut )
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}
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}
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/* Find histogram of in, and use that to set Lb, Lw levels.
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/* Find histogram of in, and use that to set Lb, Lw levels.
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* @(#) im_tone_analyse: find the histogram of a LabS or LabQ image and use
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* @(#) that to set the Ln and Lw parameters of im_tone_build()
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*/
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*/
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int
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int
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im_tone_analyse(
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im_tone_analyse(
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