1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
|
// Copyright (c) the JPEG XL Project Authors. All rights reserved.
//
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
#include <stdio.h>
#include <stdlib.h>
#include "lib/extras/codec.h"
#include "lib/extras/hlg.h"
#include "lib/extras/tone_mapping.h"
#include "lib/jxl/base/thread_pool_internal.h"
#include "lib/jxl/enc_color_management.h"
#include "tools/args.h"
#include "tools/cmdline.h"
int main(int argc, const char** argv) {
jxl::ThreadPoolInternal pool;
jpegxl::tools::CommandLineParser parser;
float target_nits = 0;
auto target_nits_option = parser.AddOptionValue(
't', "target_nits", "nits", "peak luminance of the target display",
&target_nits, &jpegxl::tools::ParseFloat, 0);
float surround_nits = 5;
parser.AddOptionValue(
's', "surround_nits", "nits",
"surround luminance of the viewing environment (default: 5)",
&surround_nits, &jpegxl::tools::ParseFloat, 0);
float preserve_saturation = .1f;
parser.AddOptionValue(
'\0', "preserve_saturation", "0..1",
"to what extent to try and preserve saturation over luminance if a gamma "
"< 1 generates out-of-gamut colors",
&preserve_saturation, &jpegxl::tools::ParseFloat, 0);
bool pq = false;
parser.AddOptionFlag('p', "pq",
"write the output with absolute luminance using PQ", &pq,
&jpegxl::tools::SetBooleanTrue, 0);
const char* input_filename = nullptr;
auto input_filename_option = parser.AddPositionalOption(
"input", true, "input image", &input_filename, 0);
const char* output_filename = nullptr;
auto output_filename_option = parser.AddPositionalOption(
"output", true, "output image", &output_filename, 0);
if (!parser.Parse(argc, argv)) {
fprintf(stderr, "See -h for help.\n");
return EXIT_FAILURE;
}
if (parser.HelpFlagPassed()) {
parser.PrintHelp();
return EXIT_SUCCESS;
}
if (!parser.GetOption(target_nits_option)->matched()) {
fprintf(stderr,
"Missing required argument --target_nits.\nSee -h for help.\n");
return EXIT_FAILURE;
}
if (!parser.GetOption(input_filename_option)->matched()) {
fprintf(stderr, "Missing input filename.\nSee -h for help.\n");
return EXIT_FAILURE;
}
if (!parser.GetOption(output_filename_option)->matched()) {
fprintf(stderr, "Missing output filename.\nSee -h for help.\n");
return EXIT_FAILURE;
}
jxl::CodecInOut image;
jxl::extras::ColorHints color_hints;
color_hints.Add("color_space", "RGB_D65_202_Rel_HLG");
JXL_CHECK(jxl::SetFromFile(input_filename, color_hints, &image, &pool));
// Ensures that conversions to linear by JxlCms will not apply the OOTF as we
// apply it ourselves to control the subsequent gamut mapping.
image.metadata.m.SetIntensityTarget(301);
const float gamma = jxl::GetHlgGamma(target_nits, surround_nits);
fprintf(stderr, "Using a system gamma of %g\n", gamma);
JXL_CHECK(jxl::HlgOOTF(&image.Main(), gamma, &pool));
JXL_CHECK(jxl::GamutMap(&image, preserve_saturation, &pool));
image.metadata.m.SetIntensityTarget(target_nits);
jxl::ColorEncoding c_out = image.metadata.m.color_encoding;
if (pq) {
c_out.tf.SetTransferFunction(jxl::TransferFunction::kPQ);
} else {
c_out.tf.SetTransferFunction(jxl::TransferFunction::k709);
}
JXL_CHECK(c_out.CreateICC());
JXL_CHECK(image.TransformTo(c_out, jxl::GetJxlCms(), &pool));
image.metadata.m.color_encoding = c_out;
JXL_CHECK(jxl::EncodeToFile(image, output_filename, &pool));
}
|
