gulp-jimp

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

// Adds effect on all samples images.
gulp.task('jimp', function() {
	gulp.src([
		PATHS.export_src_img + '/samples/**/*.{png,gif,jpg}',
		PATHS.export_build_img + '/samples/**/*.{png,gif,jpg}'
	], {
		base: '.'
	})
	.pipe(jimp({
		'': {
			posterize: 2,
			greyscale: true
		}
	})).pipe(gulp.dest('./'));
});