mirror of https://github.com/GNOME/gimp.git
modules: add a filmic proof display filter
Add a display filter that can be used in scene-referred imaging workflows, this is using a luminance-only approximation of the ACES filmic HDR to SDR proofing mapping - see link in source comment for details.
This commit is contained in:
Øyvind Kolås
parent
b2a9bb4688
commit
fe14feaaff
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@ -37,6 +37,7 @@ lib_LTLIBRARIES = \
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libcolor-selector-wheel.la \
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libdisplay-filter-clip-warning.la \
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libdisplay-filter-color-blind.la \
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libdisplay-filter-filmic.la \
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libdisplay-filter-gamma.la \
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libdisplay-filter-high-contrast.la \
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$(controller_midi_module) \
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@ -70,6 +71,11 @@ libdisplay_filter_color_blind_la_SOURCES = display-filter-color-blind.c
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libdisplay_filter_color_blind_la_LDFLAGS = -avoid-version -module $(no_undefined)
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libdisplay_filter_color_blind_la_LIBADD = $(display_filter_libadd)
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libdisplay_filter_filmic_la_SOURCES = display-filter-filmic.c
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libdisplay_filter_filmic_la_LDFLAGS = -avoid-version -module $(no_undefined)
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libdisplay_filter_filmic_la_LIBADD = $(display_filter_libadd)
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libdisplay_filter_gamma_la_SOURCES = display-filter-gamma.c
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libdisplay_filter_gamma_la_LDFLAGS = -avoid-version -module $(no_undefined)
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libdisplay_filter_gamma_la_LIBADD = $(display_filter_libadd)
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@ -0,0 +1,231 @@
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/* GIMP - The GNU Image Manipulation Program
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* Copyright (C) 2018 Øyvind Kolås <pippin@gimp.org>
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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#include "config.h"
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#include <gegl.h>
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#include <gtk/gtk.h>
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#include "libgimpcolor/gimpcolor.h"
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#include "libgimpconfig/gimpconfig.h"
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#include "libgimpmath/gimpmath.h"
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#include "libgimpmodule/gimpmodule.h"
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#include "libgimpwidgets/gimpwidgets.h"
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#include "libgimp/libgimp-intl.h"
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#define DEFAULT_EXPOSURE 0.0
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#define CDISPLAY_TYPE_FILMIC (cdisplay_filmic_get_type ())
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#define CDISPLAY_FILMIC(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), CDISPLAY_TYPE_FILMIC, CdisplayFilmic))
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#define CDISPLAY_FILMIC_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST ((klass), CDISPLAY_TYPE_FILMIC, CdisplayFilmicClass))
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#define CDISPLAY_IS_FILMIC(obj) (G_TYPE_CHECK_INSTANCE_TYPE ((obj), CDISPLAY_TYPE_FILMIC))
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#define CDISPLAY_IS_FILMIC_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), CDISPLAY_TYPE_FILMIC))
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typedef struct _CdisplayFilmic CdisplayFilmic;
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typedef struct _CdisplayFilmicClass CdisplayFilmicClass;
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struct _CdisplayFilmic
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{
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GimpColorDisplay parent_instance;
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gdouble exposure;
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};
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struct _CdisplayFilmicClass
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{
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GimpColorDisplayClass parent_instance;
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};
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enum
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{
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PROP_0,
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PROP_EXPOSURE
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};
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static GType cdisplay_filmic_get_type (void);
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static void cdisplay_filmic_set_property (GObject *object,
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guint property_id,
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const GValue *value,
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GParamSpec *pspec);
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static void cdisplay_filmic_get_property (GObject *object,
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guint property_id,
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GValue *value,
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GParamSpec *pspec);
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static void cdisplay_filmic_convert_buffer (GimpColorDisplay *display,
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GeglBuffer *buffer,
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GeglRectangle *area);
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static void cdisplay_filmic_set_exposure (CdisplayFilmic *filmic,
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gdouble value);
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static const GimpModuleInfo cdisplay_filmic_info =
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{
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GIMP_MODULE_ABI_VERSION,
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N_("Filmic HDR to SDR proof color display filter, usin an approximation of the ACES filmic transform."),
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"Øyvind Kolås <pippin@gimp.org>",
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"v0.2",
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"(c) 2018, released under the GPL",
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"July 17, 2018"
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};
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G_DEFINE_DYNAMIC_TYPE (CdisplayFilmic, cdisplay_filmic,
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GIMP_TYPE_COLOR_DISPLAY)
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G_MODULE_EXPORT const GimpModuleInfo *
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gimp_module_query (GTypeModule *module)
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{
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return &cdisplay_filmic_info;
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}
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G_MODULE_EXPORT gboolean
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gimp_module_register (GTypeModule *module)
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{
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cdisplay_filmic_register_type (module);
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return TRUE;
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}
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static void
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cdisplay_filmic_class_init (CdisplayFilmicClass *klass)
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{
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GObjectClass *object_class = G_OBJECT_CLASS (klass);
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GimpColorDisplayClass *display_class = GIMP_COLOR_DISPLAY_CLASS (klass);
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object_class->get_property = cdisplay_filmic_get_property;
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object_class->set_property = cdisplay_filmic_set_property;
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GIMP_CONFIG_PROP_DOUBLE (object_class, PROP_EXPOSURE,
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"exposure",
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_("pre-transform change in stops"),
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NULL,
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-10.0, 10.0, DEFAULT_EXPOSURE,
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1);
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display_class->name = _("Filmic");
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display_class->help_id = "gimp-colordisplay-filmic";
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display_class->icon_name = GIMP_ICON_DISPLAY_FILTER_GAMMA;
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display_class->convert_buffer = cdisplay_filmic_convert_buffer;
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}
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static void
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cdisplay_filmic_class_finalize (CdisplayFilmicClass *klass)
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{
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}
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static void
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cdisplay_filmic_init (CdisplayFilmic *filmic)
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{
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}
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static void
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cdisplay_filmic_get_property (GObject *object,
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guint property_id,
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GValue *value,
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GParamSpec *pspec)
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{
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CdisplayFilmic *filmic = CDISPLAY_FILMIC (object);
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switch (property_id)
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{
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case PROP_EXPOSURE:
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g_value_set_double (value, filmic->exposure);
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
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break;
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}
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}
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static void
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cdisplay_filmic_set_property (GObject *object,
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guint property_id,
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const GValue *value,
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GParamSpec *pspec)
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{
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CdisplayFilmic *filmic = CDISPLAY_FILMIC (object);
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switch (property_id)
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{
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case PROP_EXPOSURE:
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cdisplay_filmic_set_exposure (filmic, g_value_get_double (value));
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
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break;
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}
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}
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static inline float aces_filmic (float x)
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{
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/*
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Approximation of the ACES filmic HDR to SDR mapping from:
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https://github.com/TheRealMJP/BakingLab/blob/master/BakingLab/ACES.hlsl
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*/
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float a = x * (x + 0.0245786f) - 0.000090537f;
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float b = x * (0.983729f * x + 0.4329510f) + 0.238081f;
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return a / b;
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}
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static void
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cdisplay_filmic_convert_buffer (GimpColorDisplay *display,
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GeglBuffer *buffer,
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GeglRectangle *area)
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{
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CdisplayFilmic *filter = CDISPLAY_FILMIC (display);
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GeglBufferIterator *iter;
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float gain = 1.0f / exp2f(-filter->exposure);
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iter = gegl_buffer_iterator_new (buffer, area, 0,
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babl_format ("RGBA float"),
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GEGL_ACCESS_READWRITE, GEGL_ABYSS_NONE);
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while (gegl_buffer_iterator_next (iter))
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{
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gfloat *data = iter->data[0];
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gint count = iter->length;
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while (count--)
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{
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*data = aces_filmic (*data * gain); data++;
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*data = aces_filmic (*data * gain); data++;
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*data = aces_filmic (*data * gain); data++;
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data++;
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}
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}
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}
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static void
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cdisplay_filmic_set_exposure (CdisplayFilmic *filmic,
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gdouble value)
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{
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if (value != filmic->exposure)
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{
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filmic->exposure = value;
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g_object_notify (G_OBJECT (filmic), "exposure");
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gimp_color_display_changed (GIMP_COLOR_DISPLAY (filmic));
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}
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}
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