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icc: Add a --measure flag that prints color difference in profile

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If --measure is passed, icc prints the color pairs with the smallest
and largest perceptual difference between them.

Converting 254 * 254 * 254 * 4 = 65 Million colors from sRGB to LAB
and then computing 254 * 254 * 254 * 3 = 49 Million DeltaEs between
them takes a while. On my laptop, it takes 17s to run. So there's
a small progress display.
This commit is contained in:
Nico Weber 2023-04-29 22:20:50 -04:00 committed by Andreas Kling
parent 8ab6e0d3a5
commit 3a5d20d82b
Notes: sideshowbarker 2024-07-16 21:42:29 +09:00 
Author: https://github.com/nico
Commit: https://github.com/SerenityOS/serenity/commit/3a5d20d82b
Pull-request: https://github.com/SerenityOS/serenity/pull/18582
1 changed files with 52 additions and 1 deletions
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53
Userland/Utilities/icc.cpp
View file

@ -10,6 +10,7 @@
#include <LibCore/DateTime.h>
#include <LibCore/File.h>
#include <LibCore/MappedFile.h>
#include <LibGfx/DeltaE.h>
#include <LibGfx/ICC/BinaryWriter.h>
#include <LibGfx/ICC/Profile.h>
#include <LibGfx/ICC/Tags.h>
@ -161,6 +162,45 @@ static ErrorOr<void> out_curves(Vector<Gfx::ICC::LutCurveType> const& curves)
return {};
}
static ErrorOr<void> print_profile_measurement(Gfx::ICC::Profile const& profile)
{
auto lab_from_rgb = [&profile](u8 r, u8 g, u8 b) {
u8 rgb[3] = { r, g, b };
return profile.to_lab(rgb);
};
float largest = -1, smallest = 1000;
Color largest_color1, largest_color2, smallest_color1, smallest_color2;
for (u8 r = 0; r < 254; ++r) {
out("\r{}/254", r + 1);
fflush(stdout);
for (u8 g = 0; g < 254; ++g) {
for (u8 b = 0; b < 254; ++b) {
auto lab = TRY(lab_from_rgb(r, g, b));
u8 delta_r[] = { 1, 0, 0 };
u8 delta_g[] = { 0, 1, 0 };
u8 delta_b[] = { 0, 0, 1 };
for (unsigned i = 0; i < sizeof(delta_r); ++i) {
auto lab2 = TRY(lab_from_rgb(r + delta_r[i], g + delta_g[i], b + delta_b[i]));
float delta = Gfx::DeltaE(lab, lab2);
if (delta > largest) {
largest = delta;
largest_color1 = Color(r, g, b);
largest_color2 = Color(r + delta_r[i], g + delta_g[i], b + delta_b[i]);
}
if (delta < smallest) {
smallest = delta;
smallest_color1 = Color(r, g, b);
smallest_color2 = Color(r + delta_r[i], g + delta_g[i], b + delta_b[i]);
}
}
}
}
}
outln("\rlargest difference between neighboring colors: {}, between {} and {}", largest, largest_color1, largest_color2);
outln("smallest difference between neighboring colors: {}, between {} and {}", smallest, smallest_color1, smallest_color2);
return {};
}
ErrorOr<int> serenity_main(Main::Arguments arguments)
{
Core::ArgsParser args_parser;
@ -177,6 +217,9 @@ ErrorOr<int> serenity_main(Main::Arguments arguments)
StringView reencode_out_path;
args_parser.add_option(reencode_out_path, "Reencode ICC profile to this path", "reencode-to", 0, "FILE");
bool measure = false;
args_parser.add_option(measure, "For RGB ICC profiles, print perceptually smallest and largest color step", "measure", 0);
bool force_print = false;
args_parser.add_option(force_print, "Print profile even when writing ICC files", "print", 0);
@ -229,7 +272,15 @@ ErrorOr<int> serenity_main(Main::Arguments arguments)
TRY(output_stream->write_until_depleted(reencoded_bytes));
}
bool do_print = (dump_out_path.is_empty() && reencode_out_path.is_empty()) || force_print;
if (measure) {
if (profile->data_color_space() != Gfx::ICC::ColorSpace::RGB) {
warnln("--measure only works for RGB ICC profiles");
return 1;
}
TRY(print_profile_measurement(*profile));
}
bool do_print = (dump_out_path.is_empty() && reencode_out_path.is_empty() && !measure) || force_print;
if (!do_print)
return 0;