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PDFium.html
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<!doctype html><html lang="en">
<head>
<meta content="text/html; charset=utf-8" http-equiv="Content-Type">
<title>PDFium CMYK to sRGB</title>
<meta content="width=device-width, initial-scale=1, shrink-to-fit=no" name="viewport">
<meta content="UD" name="w3c-status">
<link href="../default.css" rel="stylesheet" type="text/css">
<link href="../csslogo.ico" rel="shortcut icon" type="image/x-icon">
<meta content="Bikeshed version 5f7b0e20, updated Tue Aug 18 15:46:28 2020 -0700" name="generator">
<link href="https://www.w3.org/TR/css-color-4/" rel="canonical">
<meta content="79eb8abb143161f8999a89ca044d5f61e672267d" name="document-revision">
<link href="style.css" rel="stylesheet">
<style>
table.named-color-table thead th { text-align:center; background:black; color:white; }
table.named-color-table th, table.named-color-table td { padding: 0 .25em; }
table.named-color-table td { text-align:center; text-transform:uppercase; }
table.named-color-table td:nth-child(-n+2) { border:1px solid black; }
table.named-color-table td:nth-child(n+4) { background: silver; }
.color-table {
background: #808080;
display: table;
display: flex;
flex-flow: row wrap;
justify-content: space-around;
}
.color-table table { padding:1em; margin:0; float:left; }
.color-table td, .color-table th { font-size:smaller; }
.color-table th { white-space: pre-line; }
.color-table td { background: currentcolor; }
.color-table .white { color: white; }
table.deltaE td {border: 4px solid white; padding: 6px; font-size: 1.4em;}
table.deltaE td.dE0 { background: rgb(68, 243, 91)}
table.deltaE td.dE1 { background: rgb(153, 243, 68)}
table.deltaE td.dE2 { background: rgb(217, 243, 68)}
table.deltaE td.dE3 { background: rgb(243, 240, 68)}
table.deltaE td.dE4 { background: rgb(243, 202, 68)}
table.deltaE td.dE5 { background: rgb(243, 103, 68); color: white}
</style>
<style>/* style-autolinks */
.css.css, .property.property, .descriptor.descriptor {
color: #005a9c;
font-size: inherit;
font-family: inherit;
}
.css::before, .property::before, .descriptor::before {
content: "‘";
}
.css::after, .property::after, .descriptor::after {
content: "’";
}
.property, .descriptor {
/* Don't wrap property and descriptor names */
white-space: nowrap;
}
.type { /* CSS value <type> */
font-style: italic;
}
pre .property::before, pre .property::after {
content: "";
}
[data-link-type="property"]::before,
[data-link-type="propdesc"]::before,
[data-link-type="descriptor"]::before,
[data-link-type="value"]::before,
[data-link-type="function"]::before,
[data-link-type="at-rule"]::before,
[data-link-type="selector"]::before,
[data-link-type="maybe"]::before {
content: "‘";
}
[data-link-type="property"]::after,
[data-link-type="propdesc"]::after,
[data-link-type="descriptor"]::after,
[data-link-type="value"]::after,
[data-link-type="function"]::after,
[data-link-type="at-rule"]::after,
[data-link-type="selector"]::after,
[data-link-type="maybe"]::after {
content: "’";
}
[data-link-type].production::before,
[data-link-type].production::after,
.prod [data-link-type]::before,
.prod [data-link-type]::after {
content: "";
}
[data-link-type=element],
[data-link-type=element-attr] {
font-family: Menlo, Consolas, "DejaVu Sans Mono", monospace;
font-size: .9em;
}
[data-link-type=element]::before { content: "<" }
[data-link-type=element]::after { content: ">" }
[data-link-type=biblio] {
white-space: pre;
}</style>
<style>/* style-counters */
body {
counter-reset: example figure issue;
}
.issue {
counter-increment: issue;
}
.issue:not(.no-marker)::before {
content: "Issue " counter(issue);
}
.example {
counter-increment: example;
}
.example:not(.no-marker)::before {
content: "Example " counter(example);
}
.invalid.example:not(.no-marker)::before,
.illegal.example:not(.no-marker)::before {
content: "Invalid Example " counter(example);
}
figcaption {
counter-increment: figure;
}
figcaption:not(.no-marker)::before {
content: "Figure " counter(figure) " ";
}</style>
<style>/* style-dfn-panel */
.dfn-panel {
position: absolute;
z-index: 35;
height: auto;
width: -webkit-fit-content;
width: fit-content;
max-width: 300px;
max-height: 500px;
overflow: auto;
padding: 0.5em 0.75em;
font: small Helvetica Neue, sans-serif, Droid Sans Fallback;
background: #DDDDDD;
color: black;
border: outset 0.2em;
}
.dfn-panel:not(.on) { display: none; }
.dfn-panel * { margin: 0; padding: 0; text-indent: 0; }
.dfn-panel > b { display: block; }
.dfn-panel a { color: black; }
.dfn-panel a:not(:hover) { text-decoration: none !important; border-bottom: none !important; }
.dfn-panel > b + b { margin-top: 0.25em; }
.dfn-panel ul { padding: 0; }
.dfn-panel li { list-style: inside; }
.dfn-panel.activated {
display: inline-block;
position: fixed;
left: .5em;
bottom: 2em;
margin: 0 auto;
max-width: calc(100vw - 1.5em - .4em - .5em);
max-height: 30vh;
}
.dfn-paneled { cursor: pointer; }
</style>
<style>/* style-md-lists */
/* This is a weird hack for me not yet following the commonmark spec
regarding paragraph and lists. */
[data-md] > :first-child {
margin-top: 0;
}
[data-md] > :last-child {
margin-bottom: 0;
}</style>
<style>/* style-mdn-anno */
@media (max-width: 767px) { .mdn-anno { opacity: .1 } }
.mdn-anno { font: 1em sans-serif; padding: 0.3em; position: absolute; z-index: 8; right: 0.3em; background: #EEE; color: black; box-shadow: 0 0 3px #999; overflow: hidden; border-collapse: initial; border-spacing: initial; min-width: 9em; max-width: min-content; white-space: nowrap; word-wrap: normal; hyphens: none}
.mdn-anno:not(.wrapped) { opacity: 1}
.mdn-anno:hover { z-index: 9 }
.mdn-anno.wrapped { min-width: 0 }
.mdn-anno.wrapped > :not(button) { display: none; }
.mdn-anno > .mdn-anno-btn { cursor: pointer; border: none; color: #000; background: transparent; margin: -8px; float: right; padding: 10px 8px 8px 8px; outline: none; }
.mdn-anno > .mdn-anno-btn > .less-than-two-engines-flag { color: red; padding-right: 2px; }
.mdn-anno > .mdn-anno-btn > .all-engines-flag { color: green; padding-right: 2px; }
.mdn-anno > .mdn-anno-btn > span { color: #fff; background-color: #000; font-weight: normal; font-family: zillaslab, Palatino, "Palatino Linotype", serif; padding: 2px 3px 0px 3px; line-height: 1.3em; vertical-align: top; }
.mdn-anno > .feature { margin-top: 20px; }
.mdn-anno > .feature:not(:first-of-type) { border-top: 1px solid #999; margin-top: 6px; padding-top: 2px; }
.mdn-anno > .feature > .less-than-two-engines-text { color: red }
.mdn-anno > .feature > .all-engines-text { color: green }
.mdn-anno > .feature > p { font-size: .75em; margin-top: 6px; margin-bottom: 0; }
.mdn-anno > .feature > p + p { margin-top: 3px; }
.mdn-anno > .feature > .support { display: block; font-size: 0.6em; margin: 0; padding: 0; margin-top: 2px }
.mdn-anno > .feature > .support + div { padding-top: 0.5em; }
.mdn-anno > .feature > .support > hr { display: block; border: none; border-top: 1px dotted #999; padding: 3px 0px 0px 0px; margin: 2px 3px 0px 3px; }
.mdn-anno > .feature > .support > hr::before { content: ""; }
.mdn-anno > .feature > .support > span { padding: 0.2em 0; display: block; display: table; }
.mdn-anno > .feature > .support > span.no { color: #CCCCCC; filter: grayscale(100%); }
.mdn-anno > .feature > .support > span.no::before { opacity: 0.5; }
.mdn-anno > .feature > .support > span:first-of-type { padding-top: 0.5em; }
.mdn-anno > .feature > .support > span > span { padding: 0 0.5em; display: table-cell; }
.mdn-anno > .feature > .support > span > span:first-child { width: 100%; }
.mdn-anno > .feature > .support > span > span:last-child { width: 100%; white-space: pre; padding: 0; }
.mdn-anno > .feature > .support > span::before { content: ' '; display: table-cell; min-width: 1.5em; height: 1.5em; background: no-repeat center center; background-size: contain; text-align: right; font-size: 0.75em; font-weight: bold; }
.mdn-anno > .feature > .support > .chrome_android::before { background-image: url(https://resources.whatwg.org/browser-logos/chrome.svg); }
.mdn-anno > .feature > .support > .firefox_android::before { background-image: url(https://resources.whatwg.org/browser-logos/firefox.png); }
.mdn-anno > .feature > .support > .chrome::before { background-image: url(https://resources.whatwg.org/browser-logos/chrome.svg); }
.mdn-anno > .feature > .support > .edge_blink::before { background-image: url(https://resources.whatwg.org/browser-logos/edge.svg); }
.mdn-anno > .feature > .support > .edge::before { background-image: url(https://resources.whatwg.org/browser-logos/edge_legacy.svg); }
.mdn-anno > .feature > .support > .firefox::before { background-image: url(https://resources.whatwg.org/browser-logos/firefox.png); }
.mdn-anno > .feature > .support > .ie::before { background-image: url(https://resources.whatwg.org/browser-logos/ie.png); }
.mdn-anno > .feature > .support > .safari_ios::before { background-image: url(https://resources.whatwg.org/browser-logos/safari-ios.svg); }
.mdn-anno > .feature > .support > .nodejs::before { background-image: url(https://nodejs.org/static/images/favicons/favicon.ico); }
.mdn-anno > .feature > .support > .opera_android::before { background-image: url(https://resources.whatwg.org/browser-logos/opera.svg); }
.mdn-anno > .feature > .support > .opera::before { background-image: url(https://resources.whatwg.org/browser-logos/opera.svg); }
.mdn-anno > .feature > .support > .safari::before { background-image: url(https://resources.whatwg.org/browser-logos/safari.png); }
.mdn-anno > .feature > .support > .samsunginternet_android::before { background-image: url(https://resources.whatwg.org/browser-logos/samsung.svg); }
.mdn-anno > .feature > .support > .webview_android::before { background-image: url(https://resources.whatwg.org/browser-logos/android-webview.png); }
.name-slug-mismatch { color: red }
.caniuse-status:hover { z-index: 9; }
/* dt, li, .issue, .note, and .example are "position: relative", so to put annotation at right margin, must move to right of containing block */
.h-entry:not(.status-LS) dt > .mdn-anno, .h-entry:not(.status-LS) li > .mdn-anno, .h-entry:not(.status-LS) .issue > .mdn-anno, .h-entry:not(.status-LS) .note > .mdn-anno, .h-entry:not(.status-LS) .example > .mdn-anno { right: -6.7em; }
.h-entry p + .mdn-anno { margin-top: 0; }
h2 + .mdn-anno.after { margin: -48px 0 0 0; }
h3 + .mdn-anno.after { margin: -46px 0 0 0; }
h4 + .mdn-anno.after { margin: -42px 0 0 0; }
h5 + .mdn-anno.after { margin: -40px 0 0 0; }
h6 + .mdn-anno.after { margin: -40px 0 0 0; }
</style>
<style>/* style-selflinks */
.heading, .issue, .note, .example, li, dt {
position: relative;
}
a.self-link {
position: absolute;
top: 0;
left: calc(-1 * (3.5rem - 26px));
width: calc(3.5rem - 26px);
height: 2em;
text-align: center;
border: none;
transition: opacity .2s;
opacity: .5;
}
a.self-link:hover {
opacity: 1;
}
.heading > a.self-link {
font-size: 83%;
}
li > a.self-link {
left: calc(-1 * (3.5rem - 26px) - 2em);
}
dfn > a.self-link {
top: auto;
left: auto;
opacity: 0;
width: 1.5em;
height: 1.5em;
background: gray;
color: white;
font-style: normal;
transition: opacity .2s, background-color .2s, color .2s;
}
dfn:hover > a.self-link {
opacity: 1;
}
dfn > a.self-link:hover {
color: black;
}
a.self-link::before { content: "¶"; }
.heading > a.self-link::before { content: "§"; }
dfn > a.self-link::before { content: "#"; }</style>
<style>/* style-syntax-highlighting */
.highlight:not(.idl) { background: hsl(24, 20%, 95%); }
code.highlight { padding: .1em; border-radius: .3em; }
pre.highlight, pre > code.highlight { display: block; padding: 1em; margin: .5em 0; overflow: auto; border-radius: 0; }
c-[a] { color: #990055 } /* Keyword.Declaration */
c-[b] { color: #990055 } /* Keyword.Type */
c-[c] { color: #708090 } /* Comment */
c-[d] { color: #708090 } /* Comment.Multiline */
c-[e] { color: #0077aa } /* Name.Attribute */
c-[f] { color: #669900 } /* Name.Tag */
c-[g] { color: #222222 } /* Name.Variable */
c-[k] { color: #990055 } /* Keyword */
c-[l] { color: #000000 } /* Literal */
c-[m] { color: #000000 } /* Literal.Number */
c-[n] { color: #0077aa } /* Name */
c-[o] { color: #999999 } /* Operator */
c-[p] { color: #999999 } /* Punctuation */
c-[s] { color: #a67f59 } /* Literal.String */
c-[t] { color: #a67f59 } /* Literal.String.Single */
c-[u] { color: #a67f59 } /* Literal.String.Double */
c-[cp] { color: #708090 } /* Comment.Preproc */
c-[c1] { color: #708090 } /* Comment.Single */
c-[cs] { color: #708090 } /* Comment.Special */
c-[kc] { color: #990055 } /* Keyword.Constant */
c-[kn] { color: #990055 } /* Keyword.Namespace */
c-[kp] { color: #990055 } /* Keyword.Pseudo */
c-[kr] { color: #990055 } /* Keyword.Reserved */
c-[ld] { color: #000000 } /* Literal.Date */
c-[nc] { color: #0077aa } /* Name.Class */
c-[no] { color: #0077aa } /* Name.Constant */
c-[nd] { color: #0077aa } /* Name.Decorator */
c-[ni] { color: #0077aa } /* Name.Entity */
c-[ne] { color: #0077aa } /* Name.Exception */
c-[nf] { color: #0077aa } /* Name.Function */
c-[nl] { color: #0077aa } /* Name.Label */
c-[nn] { color: #0077aa } /* Name.Namespace */
c-[py] { color: #0077aa } /* Name.Property */
c-[ow] { color: #999999 } /* Operator.Word */
c-[mb] { color: #000000 } /* Literal.Number.Bin */
c-[mf] { color: #000000 } /* Literal.Number.Float */
c-[mh] { color: #000000 } /* Literal.Number.Hex */
c-[mi] { color: #000000 } /* Literal.Number.Integer */
c-[mo] { color: #000000 } /* Literal.Number.Oct */
c-[sb] { color: #a67f59 } /* Literal.String.Backtick */
c-[sc] { color: #a67f59 } /* Literal.String.Char */
c-[sd] { color: #a67f59 } /* Literal.String.Doc */
c-[se] { color: #a67f59 } /* Literal.String.Escape */
c-[sh] { color: #a67f59 } /* Literal.String.Heredoc */
c-[si] { color: #a67f59 } /* Literal.String.Interpol */
c-[sx] { color: #a67f59 } /* Literal.String.Other */
c-[sr] { color: #a67f59 } /* Literal.String.Regex */
c-[ss] { color: #a67f59 } /* Literal.String.Symbol */
c-[vc] { color: #0077aa } /* Name.Variable.Class */
c-[vg] { color: #0077aa } /* Name.Variable.Global */
c-[vi] { color: #0077aa } /* Name.Variable.Instance */
c-[il] { color: #000000 } /* Literal.Number.Integer.Long */
</style>
<body class="h-entry">
<h1>PDFium CMYK to sRGB</h1>
<figure>
<object data="images/macbeth-pdfium.svg" style="width: 60vmin">
<p>A grid of colored squares. There are six columns,
labelled A to F,
and four rows,
labelled 1 to 4.
</p>
</object>
<figcaption>
<p>A color checker, used for ensuring color fidelity
in the print and photographic industries.
Averaged measured Lab values are available for each patch.
The rectangles show the Lab values, converted to sRGB.
The circles show the Lab values, passed through an ICC profile to convert them to FOGRA39 CMYK.
The CMYK value are then converted to sRGB
with the look-up table approach of PDFium.</p>
<p>The table below shows, for each patch, the DeltaE 2000 between the original Lab and the Lab value after round-tripping through CMYK. A DeltaE 2000 of 1 or more is just visible, while 5 or more is just a different color altogether.</p>
<table class="deltaE">
<tr>
<th></th>
<th>A</th>
<th>B</th>
<th>C</th>
<th>D</th>
<th>E</th>
<th>F</th>
</tr>
<tr>
<th>1</th>
<td class="dE4">4.61</td>
<td class="dE3">3.42</td>
<td class="dE3">3.76</td>
<td class="dE5">5.00</td>
<td class="dE4">4.12</td>
<td class="dE1">1.76</td>
</tr>
<tr>
<th>2</th>
<td class="dE0">0.41</td>
<td class="dE3">3.44</td>
<td class="dE1">1.30</td>
<td class="dE4">4.91</td>
<td class="dE4">3.41</td>
<td class="dE2">2.22</td>
</tr>
<tr>
<th>3</th>
<td class="dE3">3.45</td>
<td class="dE2">2.18</td>
<td class="dE2">2.01</td>
<td class="dE1">1.61</td>
<td class="dE2">2.45</td>
<td class="dE1">1.54</td>
</tr>
<tr>
<th>4</th>
<td class="dE0">0.82</td>
<td class="dE3">3.19</td>
<td class="dE4">4.18</td>
<td class="dE5">5.45</td>
<td class="dE5">5.24</td>
<td class="dE5">7.38</td>
</tr>
</table>
</figcaption>
</figure>