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Merged
merged 6 commits into from
Mar 4, 2024
Merged

blog : relative color syntax channel values #1307

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13036ad
blog : relative color syntax channel values
romainmenke Mar 1, 2024
493a138
better error recovery
romainmenke Mar 1, 2024
3540062
add percentage reference range values
romainmenke Mar 2, 2024
f075781
add note to distinquish ref ranges from max/min allowed values
romainmenke Mar 2, 2024
8aaa123
use comma in range notation
romainmenke Mar 2, 2024
2c6c134
Merge branch 'main' into relative-color-syntax-channel-values--resour…
romainmenke Mar 4, 2024
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137 changes: 137 additions & 0 deletions sites/postcss-preset-env/blog/relative-color-syntax-channel-values.md
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---
title: 'Relative Color Syntax : Channel Values'
description: Inspect the channel values for the origin color.
date: 2024-03-04
---

With relative color syntax it can become confusing what the exact values are at each step and how they can be used in math expressions.
This little tool aims to show the channel values at each step of the process.

<hr>

<label id="color-input-label-1" for="color-input-1" style="--color: oklch(0.31398 0.268 29.2339);">Channel values for:</label>
<textarea id="color-input-1" class="color-input" rows="2">oklch(from red calc(l / 2) 0.268 h)</textarea>

<div class="channel-group">
<div class="channel-group__label"></div>
<output class="color-output-channel-name" channel="1 name" for="color-input-1">l <sup>0,1</sup></output>
<output class="color-output-channel-name" channel="2 name" for="color-input-1">c <sup>0,0.4</sup></output>
<output class="color-output-channel-name" channel="3 name" for="color-input-1">h <sup>0,360</sup></output>
<output class="color-output-channel-name" channel="4 name" for="color-input-1">alpha</output>
</div>

<div class="channel-group">
<p class="channel-group__label"><i>Origin color</i></p>
<output class="color-output-channel" channel="1 input" for="color-input-1">0.628</output>
<output class="color-output-channel" channel="2 input" for="color-input-1">0.258</output>
<output class="color-output-channel" channel="3 input" for="color-input-1">29.234</output>
<output class="color-output-channel" channel="4 input" for="color-input-1">1.000</output>
</div>

<div class="channel-group">
<p class="channel-group__label"><i>Expressions</i></p>
<output class="color-output-channel" channel="1 calc" for="color-input-1">calc(l / 2)</output>
<output class="color-output-channel" channel="2 calc" for="color-input-1">0.268</output>
<output class="color-output-channel" channel="3 calc" for="color-input-1">h</output>
<output class="color-output-channel" channel="4 calc" for="color-input-1">1.000</output>
</div>

<div class="channel-group">
<p class="channel-group__label"><i>Output color</i></p>
<output class="color-output-channel" channel="1 output" for="color-input-1">0.314</output>
<output class="color-output-channel" channel="2 output" for="color-input-1">0.268</output>
<output class="color-output-channel" channel="3 output" for="color-input-1">29.234</output>
<output class="color-output-channel" channel="4 output" for="color-input-1">1.000</output>
</div>

<hr>

The indicated ranges of values correspond to 0% and 100% for each channel.
They are not the minimum and maximum allowed values, you can use values beyond these ranges.

{% block scripts %}<script async defer src="{{ '/static/js/blog_relative_color_syntax_channel_values_2024_03_02.js' | addHash }}"></script>{% endblock %}

<style>
.color-input, .color-output-channel {
background-color: #263238;
border-radius: 3px;
border: 1px solid grey;
color: white;
display: block;
font-size: 0.875em;
line-height: 2;
padding: 2px 8px;
position: relative;
text-align: left;
}

.color-input {
margin: 1rem 0 2rem auto;
width: calc(80% - 2px);
}

.channel-group {
align-items: start;
display: flex;
gap: 1rem;
justify-content: space-between;
margin: 0 0 1rem;
max-width: 100%;
}

.color-output-channel, .channel-group__label {
flex-basis: 200px;
flex-grow: 1;
font-family: monospace;
font-size: 0.875rem;
max-width: 20%;
text-align: right;
}

.channel-group__label {
text-align: left;
margin-top: 0.25rem;
}

.color-output-channel-name {
border-bottom: 1px solid currentColor;
flex-basis: 200px;
flex-grow: 1;
font-family: monospace;
font-size: 1rem;
max-width: 20%;
text-align: center;
}

.color-output-channel-name sup {
display: inline-block;
padding-left: 0.75rem;
}

.color-output-channel-name sup::before {
content: "[";
content: "[" / "";
}

.color-output-channel-name sup::after {
content: "]";
content: "]" / "";
}

#color-input-label-1 {
position: relative;
margin-left: calc(20% + 2px);
}

#color-input-label-1::after {
background-color: var(--color);
border-radius: 50%;
content: "";
display: inline-block;
height: calc(0.875em * 2);
position: absolute;
right: calc(-1 * ((0.875em * 2) + 1rem));
top: -5px;
width: calc(0.875em * 2);
}
</style>
1 change: 1 addition & 0 deletions sites/postcss-preset-env/rollup.config.mjs
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Original file line number Diff line number Diff line change
Expand Up @@ -14,6 +14,7 @@ export default [
'blog_color_parser_2023_03_27',
'blog_color_mix_2023_03_27',
'blog_relative_color_syntax_2023_05_22',
'blog_relative_color_syntax_channel_values_2024_03_02',
].map(name => ({
input: `src/static/js/${name}.js`,
output: [
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