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plug-ins: follow the assigned profile TRC in PNG export.

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Similar to JPEG export (commit c5f7bac2ba)
as discussed with Ell. GIMP should follow and save as-is any *assigned*
profile. We only make a decision about whether to convert from storage
precision to another format when the profile is the default GIMP one.
This commit is contained in:
Jehan
2019-05-25 14:01:55 +02:00
parent 5c80a2e600
commit 72c5d24fe9
1 changed files with 45 additions and 43 deletions
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88
plug-ins/common/file-png.c
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@ -1463,7 +1463,7 @@ save_image (const gchar *filename,
gint num; /* Number of rows to load */
FILE *fp; /* File pointer */
GimpColorProfile *profile = NULL; /* Color profile */
gboolean linear; /* Save linear RGB */
gboolean out_linear; /* Save linear RGB */
GeglBuffer *buffer; /* GEGL buffer for layer */
const Babl *file_format; /* BABL format of file */
png_structp pp; /* PNG read pointer */
@ -1478,47 +1478,57 @@ save_image (const gchar *filename,
time_t cutime; /* Time since epoch */
struct tm *gmt; /* GMT broken down */
gint color_type; /* PNG color type */
gint bit_depth = 16; /* Default to bit bepth 16 */
gint bit_depth; /* Default to bit depth 16 */
guchar remap[256]; /* Re-mapping for the palette */
png_textp text = NULL;
out_linear = FALSE;
#if defined(PNG_iCCP_SUPPORTED)
profile = gimp_image_get_color_profile (orig_image_ID);
if (pngvals.save_profile)
profile = gimp_image_get_effective_color_profile (orig_image_ID);
{
if (profile && gimp_color_profile_is_linear (profile) &&
pngvals.export_format == PNG_FORMAT_AUTO)
out_linear = TRUE;
if (! profile)
profile = gimp_image_get_effective_color_profile (orig_image_ID);
if (! out_linear && gimp_color_profile_is_linear (profile))
{
/* This should happen only when using default linear profile
* (no profile explicitly set) or when not exporting to
* PNG_FORMAT_AUTO.
*/
GimpColorProfile *saved_profile;
saved_profile = gimp_color_profile_new_srgb_trc_from_color_profile (profile);
g_object_unref (profile);
profile = saved_profile;
}
}
#endif
/* We save as 8-bit PNG only if:
* (1) Work image is 8-bit linear with linear profile to be saved.
* (2) Work image is 8-bit non-linear or perceptual with or without
* profile.
*/
bit_depth = 16;
switch (gimp_image_get_precision (image_ID))
{
case GIMP_PRECISION_U8_LINEAR:
/* only keep 8 bit linear RGB if we also save a profile */
if (profile)
if (out_linear)
bit_depth = 8;
case GIMP_PRECISION_U16_LINEAR:
case GIMP_PRECISION_U32_LINEAR:
case GIMP_PRECISION_HALF_LINEAR:
case GIMP_PRECISION_FLOAT_LINEAR:
case GIMP_PRECISION_DOUBLE_LINEAR:
/* save linear RGB only if we save a profile, or a loader won't
* do the right thing
*/
if (profile)
linear = TRUE;
else
linear = FALSE;
break;
case GIMP_PRECISION_U8_GAMMA:
bit_depth = 8;
break;
case GIMP_PRECISION_U16_GAMMA:
case GIMP_PRECISION_U32_GAMMA:
case GIMP_PRECISION_HALF_GAMMA:
case GIMP_PRECISION_FLOAT_GAMMA:
case GIMP_PRECISION_DOUBLE_GAMMA:
linear = FALSE;
default:
break;
}
@ -1604,14 +1614,14 @@ save_image (const gchar *filename,
color_type = PNG_COLOR_TYPE_RGB;
if (bit_depth == 8)
{
if (linear)
if (out_linear)
file_format = babl_format ("RGB u8");
else
file_format = babl_format ("R'G'B' u8");
}
else
{
if (linear)
if (out_linear)
file_format = babl_format ("RGB u16");
else
file_format = babl_format ("R'G'B' u16");
@ -1622,14 +1632,14 @@ save_image (const gchar *filename,
color_type = PNG_COLOR_TYPE_RGB_ALPHA;
if (bit_depth == 8)
{
if (linear)
if (out_linear)
file_format = babl_format ("RGBA u8");
else
file_format = babl_format ("R'G'B'A u8");
}
else
{
if (linear)
if (out_linear)
file_format = babl_format ("RGBA u16");
else
file_format = babl_format ("R'G'B'A u16");
@ -1640,14 +1650,14 @@ save_image (const gchar *filename,
color_type = PNG_COLOR_TYPE_GRAY;
if (bit_depth == 8)
{
if (linear)
if (out_linear)
file_format = babl_format ("Y u8");
else
file_format = babl_format ("Y' u8");
}
else
{
if (linear)
if (out_linear)
file_format = babl_format ("Y u16");
else
file_format = babl_format ("Y' u16");
@ -1658,14 +1668,14 @@ save_image (const gchar *filename,
color_type = PNG_COLOR_TYPE_GRAY_ALPHA;
if (bit_depth == 8)
{
if (linear)
if (out_linear)
file_format = babl_format ("YA u8");
else
file_format = babl_format ("Y'A u8");
}
else
{
if (linear)
if (out_linear)
file_format = babl_format ("YA u16");
else
file_format = babl_format ("Y'A u16");
@ -1739,14 +1749,6 @@ save_image (const gchar *filename,
bit_depth = 16;
break;
}
if (linear && profile)
{
GimpColorProfile *saved_profile;
saved_profile = gimp_color_profile_new_srgb_trc_from_color_profile (profile);
g_object_unref (profile);
profile = saved_profile;
}
}
bpp = babl_format_get_bytes_per_pixel (file_format);
@ -1831,7 +1833,7 @@ save_image (const gchar *filename,
}
#if defined(PNG_iCCP_SUPPORTED)
if (profile)
if (pngvals.save_profile)
{
GimpParasite *parasite;
gchar *profile_name = NULL;
@ -1855,9 +1857,9 @@ save_image (const gchar *filename,
icc_length);
g_free (profile_name);
g_object_unref (profile);
}
if (profile)
g_object_unref (profile);
#endif
#ifdef PNG_zTXt_SUPPORTED