Add interlaced option (#23)

imagemin · Oct 4, 2019 · ef42c2d · ef42c2d
1 parent 3916605
commit ef42c2d
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diff --git a/index.js b/index.js
@@ -9,6 +9,7 @@ module.exports = options => async buffer => {
 		bitDepthReduction: true,
 		colorTypeReduction: true,
 		paletteReduction: true,
+		interlaced: false,
 		errorRecovery: true,
 		...options
 	};
@@ -39,6 +40,10 @@ module.exports = options => async buffer => {
 		arguments_.push('-nb');
 	}
 
+	if (options.interlaced) {
+		arguments_.push('-i', '1');
+	}
+
 	if (!options.colorTypeReduction) {
 		arguments_.push('-nc');
 	}

diff --git a/readme.md b/readme.md
@@ -78,6 +78,13 @@ Default: `true`
 
 Apply palette reduction.
 
+##### interlaced
+
+Type: `boolean`<br>
+Default: `false`
+
+Make images interlaced (progressive rendering). Interlaced images look better when they're loaded partially, but usually interlace makes compression less efficient.
+
 ##### errorRecovery
 
 Type: `boolean`<br>