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avcodec/tiff: set color_trc, remove sRGB conversion

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This commit is contained in:
Paul B Mahol 2019-08-31 20:57:29 +02:00
parent 63689b16ad
commit d7529b03ba
1 changed files with 8 additions and 10 deletions
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18
libavcodec/tiff.c
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@ -773,16 +773,8 @@ static int tiff_unpack_strip(TiffContext *s, AVFrame *p, uint8_t *dst, int strid
return 0;
}
static float av_always_inline linear_to_srgb(float value) {
if (value <= 0.0031308f)
return value * 12.92f;
else
return powf(value * 1.055f, 1.0f / 2.4f) - 0.055f;
}
/**
* Map stored raw sensor values into linear reference values (see: DNG Specification - Chapter 5)
* Then convert to sRGB color space.
*/
static uint16_t av_always_inline dng_process_color16(uint16_t value,
const uint16_t *lut,
@ -800,8 +792,7 @@ static uint16_t av_always_inline dng_process_color16(uint16_t value,
// Color scaling
value_norm = (float)value * scale_factor;
// Color space conversion (sRGB)
value = av_clip_uint16_c((uint16_t)(linear_to_srgb(value_norm) * 0xFFFF));
value = av_clip_uint16_c(value_norm * 65535);
return value;
}
@ -1920,6 +1911,13 @@ again:
}
}
if (s->photometric == TIFF_PHOTOMETRIC_LINEAR_RAW ||
s->photometric == TIFF_PHOTOMETRIC_CFA) {
p->color_trc = AVCOL_TRC_LINEAR;
} else if (s->photometric == TIFF_PHOTOMETRIC_BLACK_IS_ZERO) {
p->color_trc = AVCOL_TRC_GAMMA22;
}
/* Handle DNG images with JPEG-compressed tiles */
if (is_dng && s->is_tiled) {