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Load AdobeRGB Nikon JPEGs correctly

This commit is contained in:
Přemysl Eric Janouch 2024-01-23 22:14:21 +01:00
parent 51ca3f8e2e
commit 84269b2ba2
Signed by: p
GPG Key ID: A0420B94F92B9493
2 changed files with 122 additions and 7 deletions
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2
LICENSE
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@ -1,4 +1,4 @@
Copyright (c) 2021 - 2023, Přemysl Eric Janouch <p@janouch.name>
Copyright (c) 2021 - 2024, Přemysl Eric Janouch <p@janouch.name>
Permission to use, copy, modify, and/or distribute this software for any
purpose with or without fee is hereby granted.

127
fiv-io.c
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@ -1,7 +1,7 @@
//
// fiv-io.c: image operations
//
// Copyright (c) 2021 - 2023, Přemysl Eric Janouch <p@janouch.name>
// Copyright (c) 2021 - 2024, Přemysl Eric Janouch <p@janouch.name>
//
// Permission to use, copy, modify, and/or distribute this software for any
// purpose with or without fee is hereby granted.
@ -316,29 +316,44 @@ fiv_io_profile_new_sRGB(void)
}
FivIoProfile
fiv_io_profile_new_sRGB_gamma(double gamma)
fiv_io_profile_new_parametric(
double gamma, double whitepoint[2], double primaries[6])
{
#ifdef HAVE_LCMS2
// TODO(p): Make sure to use the library in a thread-safe manner.
cmsContext context = NULL;
static const cmsCIExyY D65 = {0.3127, 0.3290, 1.0};
static const cmsCIExyYTRIPLE primaries = {
{0.6400, 0.3300, 1.0}, {0.3000, 0.6000, 1.0}, {0.1500, 0.0600, 1.0}};
const cmsCIExyY cmsWP = {whitepoint[0], whitepoint[1], 1.0};
const cmsCIExyYTRIPLE cmsP = {
{primaries[0], primaries[1], 1.0},
{primaries[2], primaries[3], 1.0},
{primaries[4], primaries[5], 1.0},
};
cmsToneCurve *curve = cmsBuildGamma(context, gamma);
if (!curve)
return NULL;
cmsHPROFILE profile = cmsCreateRGBProfileTHR(
context, &D65, &primaries, (cmsToneCurve *[3]){curve, curve, curve});
context, &cmsWP, &cmsP, (cmsToneCurve *[3]){curve, curve, curve});
cmsFreeToneCurve(curve);
return profile;
#else
(void) gamma;
(void) whitepoint;
(void) primaries;
return NULL;
#endif
}
FivIoProfile
fiv_io_profile_new_sRGB_gamma(double gamma)
{
return fiv_io_profile_new_parametric(gamma,
(double[2]){0.3127, 0.3290},
(double[6]){0.6400, 0.3300, 0.3000, 0.6000, 0.1500, 0.0600});
}
static FivIoProfile
fiv_io_profile_new_from_bytes(GBytes *bytes)
{
@ -1329,6 +1344,100 @@ parse_mpf(
// --- JPEG --------------------------------------------------------------------
struct exif_profile {
double whitepoint[2]; ///< TIFF_WhitePoint
double primaries[6]; ///< TIFF_PrimaryChromaticities
enum Exif_ColorSpace colorspace; ///< Exif_ColorSpace
double gamma; ///< Exif_Gamma
bool have_whitepoint;
bool have_primaries;
bool have_colorspace;
bool have_gamma;
};
static bool
parse_exif_profile_reals(
const struct tiffer *T, struct tiffer_entry *entry, double *out)
{
while (tiffer_real(T, entry, out++))
if (!tiffer_next_value(entry))
return false;
return true;
}
static void
parse_exif_profile_subifd(
struct exif_profile *params, const struct tiffer *T, uint32_t offset)
{
struct tiffer subT = {};
if (!tiffer_subifd(T, offset, &subT))
return;
struct tiffer_entry entry = {};
while (tiffer_next_entry(&subT, &entry)) {
int64_t value = 0;
if (G_UNLIKELY(entry.tag == Exif_ColorSpace) &&
entry.type == TIFFER_SHORT && entry.remaining_count == 1 &&
tiffer_integer(&subT, &entry, &value)) {
params->have_colorspace = true;
params->colorspace = value;
} else if (G_UNLIKELY(entry.tag == Exif_Gamma) &&
entry.type == TIFFER_RATIONAL && entry.remaining_count == 1 &&
tiffer_real(&subT, &entry, &params->gamma)) {
params->have_gamma = true;
}
}
}
static FivIoProfile
parse_exif_profile(const void *data, size_t len)
{
struct tiffer T = {};
if (!tiffer_init(&T, (const uint8_t *) data, len) || !tiffer_next_ifd(&T))
return NULL;
struct exif_profile params = {};
struct tiffer_entry entry = {};
while (tiffer_next_entry(&T, &entry)) {
int64_t offset = 0;
if (G_UNLIKELY(entry.tag == TIFF_ExifIFDPointer) &&
entry.type == TIFFER_LONG && entry.remaining_count == 1 &&
tiffer_integer(&T, &entry, &offset) &&
offset >= 0 && offset <= UINT32_MAX) {
parse_exif_profile_subifd(&params, &T, offset);
} else if (G_UNLIKELY(entry.tag == TIFF_WhitePoint) &&
entry.type == TIFFER_RATIONAL &&
entry.remaining_count == G_N_ELEMENTS(params.whitepoint)) {
params.have_whitepoint =
parse_exif_profile_reals(&T, &entry, params.whitepoint);
} else if (G_UNLIKELY(entry.tag == TIFF_PrimaryChromaticities) &&
entry.type == TIFFER_RATIONAL &&
entry.remaining_count == G_N_ELEMENTS(params.primaries)) {
params.have_primaries =
parse_exif_profile_reals(&T, &entry, params.primaries);
}
}
if (!params.have_colorspace)
return NULL;
// If sRGB is claimed, assume all parameters are standard.
if (params.colorspace == Exif_ColorSpace_sRGB)
return fiv_io_profile_new_sRGB();
// AdobeRGB Nikon JPEGs provide all of these.
if (params.colorspace != Exif_ColorSpace_Uncalibrated ||
!params.have_gamma ||
!params.have_whitepoint ||
!params.have_primaries)
return NULL;
return fiv_io_profile_new_parametric(
params.gamma, params.whitepoint, params.primaries);
}
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
struct jpeg_metadata {
GByteArray *exif; ///< Exif buffer or NULL
GByteArray *icc; ///< ICC profile buffer or NULL
@ -1481,6 +1590,9 @@ load_jpeg_finalize(FivIoImage *image, bool cmyk,
if (icc_profile)
source = fiv_io_profile_new(
g_bytes_get_data(icc_profile, NULL), g_bytes_get_size(icc_profile));
else if (image->exif)
source = parse_exif_profile(
g_bytes_get_data(image->exif, NULL), g_bytes_get_size(image->exif));
if (cmyk)
fiv_io_profile_cmyk(image, source, ctx->screen_profile);
@ -2123,6 +2235,9 @@ load_tiff_ep(
orientation >= 1 && orientation <= 8) {
image->orientation = orientation;
}
// XXX: AdobeRGB Nikon NEFs can only be distinguished by a ColorSpace tag
// from within their MakerNote.
return image;
}