Infrared Filter

Infrared Filter lets you use an infrared photography filter in CSS. This effect was created and coded by Una Kravets’ in her excellent post Infrared Photography.

/* before */

.creek {
	background: url(https://upload.wikimedia.org/wikipedia/commons/0/06/Cayoosh-creek.jpg);
	filter: infrared(-60);
	height: 426px;
	position: relative;
	width: 568px;
}

/* after */

.creek::after {
	background: url(https://upload.wikimedia.org/wikipedia/commons/0/06/Cayoosh-creek.jpg);
	position: relative;
	filter: invert(1) saturate(.75) hue-rotate(-60deg);
	content: "";
	display: block;
	height: 100%;
	mix-blend-mode: color;
	property: absolute;
	width: 100%;
}

.creek {
	background: url(https://upload.wikimedia.org/wikipedia/commons/0/06/Cayoosh-creek.jpg);
	height: 426px;
	position: relative;
	width: 568px;
}

Usage

Add Infrared Filter to your build tool:

npm install postcss-infrared-filter --save-dev

Node

require('postcss-infrared-filter').process(YOUR_CSS);

PostCSS

Add PostCSS to your build tool:

npm install postcss --save-dev

Load Infrared Filter as a PostCSS plugin:

postcss([
    require('postcss-infrared-filter')()
]);

Gulp

Add Gulp PostCSS to your build tool:

npm install gulp-postcss --save-dev

Enable Infrared Filter within your Gulpfile:

var postcss = require('gulp-postcss');

gulp.task('css', function () {
    return gulp.src('./css/src/*.css').pipe(
        postcss([
            require('postcss-infrared-filter')()
        ])
    ).pipe(
        gulp.dest('./css')
    );
});

Grunt

Add Grunt PostCSS to your build tool:

npm install grunt-postcss --save-dev

Enable Infrared Filter within your Gruntfile:

grunt.loadNpmTasks('grunt-postcss');

grunt.initConfig({
    postcss: {
        options: {
            processors: [
                require('postcss-infrared-filter')()
            ]
        },
        dist: {
            src: 'css/*.css'
        }
    }
});