doc-rst: pixfmt-007: Fix formula parsing
There are lots of warnings there: /devel/v4l/patchwork/Documentation/linux_tv/media/v4l/pixfmt-007:74: ERROR: Unexpected indentation. /devel/v4l/patchwork/Documentation/linux_tv/media/v4l/pixfmt-007:89: ERROR: Unexpected indentation. /devel/v4l/patchwork/Documentation/linux_tv/media/v4l/pixfmt-007:168: ERROR: Unexpected indentation. /devel/v4l/patchwork/Documentation/linux_tv/media/v4l/pixfmt-007:183: ERROR: Unexpected indentation. /devel/v4l/patchwork/Documentation/linux_tv/media/v4l/pixfmt-007:206: ERROR: Unexpected indentation. /devel/v4l/patchwork/Documentation/linux_tv/media/v4l/pixfmt-007:216: ERROR: Unexpected indentation. /devel/v4l/patchwork/Documentation/linux_tv/media/v4l/pixfmt-007:292: ERROR: Unexpected indentation. /devel/v4l/patchwork/Documentation/linux_tv/media/v4l/pixfmt-007:308: ERROR: Unexpected indentation. /devel/v4l/patchwork/Documentation/linux_tv/media/v4l/pixfmt-007:393: ERROR: Unexpected indentation. /devel/v4l/patchwork/Documentation/linux_tv/media/v4l/pixfmt-007:478: ERROR: Unexpected indentation. /devel/v4l/patchwork/Documentation/linux_tv/media/v4l/pixfmt-007:657: ERROR: Unexpected indentation. /devel/v4l/patchwork/Documentation/linux_tv/media/v4l/pixfmt-007:735: ERROR: Unexpected indentation. /devel/v4l/patchwork/Documentation/linux_tv/media/v4l/pixfmt-007:746: ERROR: Unexpected indentation. /devel/v4l/patchwork/Documentation/linux_tv/media/v4l/pixfmt-007:822: ERROR: Unexpected indentation. /devel/v4l/patchwork/Documentation/linux_tv/media/v4l/pixfmt-007:833: ERROR: Unexpected indentation. Also, sometimes the :sup: tag was ignored. Fix it. Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
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Mauro Carvalho Chehab
parent
ac4141ce74
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7f1bd7cdf6
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@ -71,21 +71,24 @@ SMPTE C set, so this colorspace is sometimes called SMPTE C as well.
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The transfer function defined for SMPTE 170M is the same as the one
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defined in Rec. 709.
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L' = -1.099(-L):sup:`0.45` + 0.099 for L ≤ -0.018
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L' = -1.099(-L) :sup:`0.45` + 0.099 for L ≤ -0.018
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L' = 4.5L for -0.018 < L < 0.018
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L' = 1.099L\ :sup:`0.45` - 0.099 for L ≥ 0.018
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L' = 1.099L :sup:`0.45` - 0.099 for L ≥ 0.018
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Inverse Transfer function:
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L = -((L' - 0.099) / -1.099):sup:`1/0.45` for L' ≤ -0.081
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L = -((L' - 0.099) / -1.099) :sup:`1/0.45` for L' ≤ -0.081
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L = L' / 4.5 for -0.081 < L' < 0.081
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L = ((L' + 0.099) / 1.099)\ :sup:`1/0.45` for L' ≥ 0.081
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L = ((L' + 0.099) / 1.099) :sup:`1/0.45` for L' ≥ 0.081
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The luminance (Y') and color difference (Cb and Cr) are obtained with
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the following ``V4L2_YCBCR_ENC_601`` encoding:
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Y' = 0.299R' + 0.587G' + 0.114B'
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Cb = -0.169R' - 0.331G' + 0.5B'
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@ -165,21 +168,24 @@ The full name of this standard is Rec. ITU-R BT.709-5.
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Transfer function. Normally L is in the range [0…1], but for the
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extended gamut xvYCC encoding values outside that range are allowed.
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L' = -1.099(-L):sup:`0.45` + 0.099 for L ≤ -0.018
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L' = -1.099(-L) :sup:`0.45` + 0.099 for L ≤ -0.018
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L' = 4.5L for -0.018 < L < 0.018
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L' = 1.099L\ :sup:`0.45` - 0.099 for L ≥ 0.018
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L' = 1.099L :sup:`0.45` - 0.099 for L ≥ 0.018
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Inverse Transfer function:
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L = -((L' - 0.099) / -1.099):sup:`1/0.45` for L' ≤ -0.081
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L = -((L' - 0.099) / -1.099) :sup:`1/0.45` for L' ≤ -0.081
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L = L' / 4.5 for -0.081 < L' < 0.081
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L = ((L' + 0.099) / 1.099)\ :sup:`1/0.45` for L' ≥ 0.081
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L = ((L' + 0.099) / 1.099) :sup:`1/0.45` for L' ≥ 0.081
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The luminance (Y') and color difference (Cb and Cr) are obtained with
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the following ``V4L2_YCBCR_ENC_709`` encoding:
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Y' = 0.2126R' + 0.7152G' + 0.0722B'
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Cb = -0.1146R' - 0.3854G' + 0.5B'
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@ -203,6 +209,7 @@ The xvYCC 709 encoding (``V4L2_YCBCR_ENC_XV709``, :ref:`xvycc`) is
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similar to the Rec. 709 encoding, but it allows for R', G' and B' values
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that are outside the range [0…1]. The resulting Y', Cb and Cr values are
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scaled and offset:
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Y' = (219 / 256) * (0.2126R' + 0.7152G' + 0.0722B') + (16 / 256)
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Cb = (224 / 256) * (-0.1146R' - 0.3854G' + 0.5B')
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@ -213,6 +220,7 @@ The xvYCC 601 encoding (``V4L2_YCBCR_ENC_XV601``, :ref:`xvycc`) is
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similar to the BT.601 encoding, but it allows for R', G' and B' values
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that are outside the range [0…1]. The resulting Y', Cb and Cr values are
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scaled and offset:
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Y' = (219 / 256) * (0.299R' + 0.587G' + 0.114B') + (16 / 256)
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Cb = (224 / 256) * (-0.169R' - 0.331G' + 0.5B')
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@ -289,22 +297,25 @@ These chromaticities are identical to the Rec. 709 colorspace.
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Transfer function. Note that negative values for L are only used by the
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Y'CbCr conversion.
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L' = -1.055(-L):sup:`1/2.4` + 0.055 for L < -0.0031308
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L' = -1.055(-L) :sup:`1/2.4` + 0.055 for L < -0.0031308
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L' = 12.92L for -0.0031308 ≤ L ≤ 0.0031308
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L' = 1.055L\ :sup:`1/2.4` - 0.055 for 0.0031308 < L ≤ 1
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L' = 1.055L :sup:`1/2.4` - 0.055 for 0.0031308 < L ≤ 1
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Inverse Transfer function:
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L = -((-L' + 0.055) / 1.055)\ :sup:`2.4` for L' < -0.04045
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L = -((-L' + 0.055) / 1.055) :sup:`2.4` for L' < -0.04045
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L = L' / 12.92 for -0.04045 ≤ L' ≤ 0.04045
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L = ((L' + 0.055) / 1.055)\ :sup:`2.4` for L' > 0.04045
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L = ((L' + 0.055) / 1.055) :sup:`2.4` for L' > 0.04045
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The luminance (Y') and color difference (Cb and Cr) are obtained with
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the following ``V4L2_YCBCR_ENC_SYCC`` encoding as defined by
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:ref:`sycc`:
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Y' = 0.2990R' + 0.5870G' + 0.1140B'
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Cb = -0.1687R' - 0.3313G' + 0.5B'
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@ -383,13 +394,16 @@ are:
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Transfer function:
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L' = L\ :sup:`1/2.19921875`
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L' = L :sup:`1/2.19921875`
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Inverse Transfer function:
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L = L'\ :sup:`2.19921875`
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L = L' :sup:`2.19921875`
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The luminance (Y') and color difference (Cb and Cr) are obtained with
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the following ``V4L2_YCBCR_ENC_601`` encoding:
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Y' = 0.299R' + 0.587G' + 0.114B'
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Cb = -0.169R' - 0.331G' + 0.5B'
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@ -464,17 +478,20 @@ of the primary colors and the white reference are:
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Transfer function (same as Rec. 709):
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L' = 4.5L for 0 ≤ L < 0.018
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L' = 1.099L\ :sup:`0.45` - 0.099 for 0.018 ≤ L ≤ 1
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L' = 1.099L :sup:`0.45` - 0.099 for 0.018 ≤ L ≤ 1
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Inverse Transfer function:
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L = L' / 4.5 for L' < 0.081
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L = ((L' + 0.099) / 1.099)\ :sup:`1/0.45` for L' ≥ 0.081
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L = ((L' + 0.099) / 1.099) :sup:`1/0.45` for L' ≥ 0.081
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The luminance (Y') and color difference (Cb and Cr) are obtained with
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the following ``V4L2_YCBCR_ENC_BT2020`` encoding:
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Y' = 0.2627R' + 0.6780G' + 0.0593B'
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Cb = -0.1396R' - 0.3604G' + 0.5B'
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@ -488,18 +505,23 @@ There is also an alternate constant luminance R'G'B' to Yc'CbcCrc
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(``V4L2_YCBCR_ENC_BT2020_CONST_LUM``) encoding:
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Luma:
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Yc' = (0.2627R + 0.6780G + 0.0593B)'
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B' - Yc' ≤ 0:
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Cbc = (B' - Yc') / 1.9404
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B' - Yc' > 0:
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Cbc = (B' - Yc') / 1.5816
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R' - Yc' ≤ 0:
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Crc = (R' - Y') / 1.7184
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R' - Yc' > 0:
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Crc = (R' - Y') / 0.9936
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Yc' is clamped to the range [0…1] and Cbc and Crc are clamped to the
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@ -571,10 +593,12 @@ primary colors and the white reference are:
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Transfer function:
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L' = L\ :sup:`1/2.6`
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L' = L :sup:`1/2.6`
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Inverse Transfer function:
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L = L'\ :sup:`2.6`
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L = L' :sup:`2.6`
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Y'CbCr encoding is not specified. V4L2 defaults to Rec. 709.
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@ -643,17 +667,20 @@ and the white reference are:
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These chromaticities are identical to the SMPTE 170M colorspace.
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Transfer function:
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L' = 4L for 0 ≤ L < 0.0228
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L' = 1.1115L\ :sup:`0.45` - 0.1115 for 0.0228 ≤ L ≤ 1
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L' = 1.1115L :sup:`0.45` - 0.1115 for 0.0228 ≤ L ≤ 1
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Inverse Transfer function:
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L = L' / 4 for 0 ≤ L' < 0.0913
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L = ((L' + 0.1115) / 1.1115)\ :sup:`1/0.45` for L' ≥ 0.0913
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L = ((L' + 0.1115) / 1.1115) :sup:`1/0.45` for L' ≥ 0.0913
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The luminance (Y') and color difference (Cb and Cr) are obtained with
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the following ``V4L2_YCBCR_ENC_SMPTE240M`` encoding:
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Y' = 0.2122R' + 0.7013G' + 0.0865B'
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Cb = -0.1161R' - 0.3839G' + 0.5B'
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@ -732,17 +759,20 @@ the Bradford method.
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The transfer function was never properly defined for NTSC 1953. The Rec.
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709 transfer function is recommended in the literature:
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L' = 4.5L for 0 ≤ L < 0.018
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L' = 1.099L\ :sup:`0.45` - 0.099 for 0.018 ≤ L ≤ 1
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L' = 1.099L :sup:`0.45` - 0.099 for 0.018 ≤ L ≤ 1
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Inverse Transfer function:
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L = L' / 4.5 for L' < 0.081
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L = ((L' + 0.099) / 1.099)\ :sup:`1/0.45` for L' ≥ 0.081
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L = ((L' + 0.099) / 1.099) :sup:`1/0.45` for L' ≥ 0.081
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The luminance (Y') and color difference (Cb and Cr) are obtained with
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the following ``V4L2_YCBCR_ENC_601`` encoding:
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Y' = 0.299R' + 0.587G' + 0.114B'
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Cb = -0.169R' - 0.331G' + 0.5B'
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@ -819,17 +849,20 @@ are:
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The transfer function was never properly defined for this colorspace.
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The Rec. 709 transfer function is recommended in the literature:
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L' = 4.5L for 0 ≤ L < 0.018
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L' = 1.099L\ :sup:`0.45` - 0.099 for 0.018 ≤ L ≤ 1
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L' = 1.099L :sup:`0.45` - 0.099 for 0.018 ≤ L ≤ 1
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Inverse Transfer function:
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L = L' / 4.5 for L' < 0.081
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L = ((L' + 0.099) / 1.099)\ :sup:`1/0.45` for L' ≥ 0.081
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L = ((L' + 0.099) / 1.099) :sup:`1/0.45` for L' ≥ 0.081
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The luminance (Y') and color difference (Cb and Cr) are obtained with
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the following ``V4L2_YCBCR_ENC_601`` encoding:
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Y' = 0.299R' + 0.587G' + 0.114B'
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Cb = -0.169R' - 0.331G' + 0.5B'
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