diff --git a/build-data/BuildArtwork.groovy b/build-data/BuildArtwork.groovy
index 6dba5a26..3f0bbbda 100755
--- a/build-data/BuildArtwork.groovy
+++ b/build-data/BuildArtwork.groovy
@@ -3,6 +3,10 @@
 import static org.apache.commons.io.FileUtils.*
 
 
+scaleFactor = [1, 2]
+thumbnailSize = [48, 48]
+
+
 void ls(f) {
 	if (f.exists()) {
 		log.info "$f (${byteCountToDisplaySize(f.length())})"
@@ -17,20 +21,26 @@ File getOriginalPath(db, id) {
 }
 
 
-File getThumbnailPath(db, id) {
-	return _args.outputPath.resolve("images/${db}/thumb/poster/${id}.png")
+File getThumbnailPath(db, id, scale) {
+	def n = id as String
+	if (scale != 1) {
+		n += '@' + scale + 'x'
+	}
+	return _args.outputPath.resolve("images/${db}/thumb/poster/${n}.png")
 }
 
 
-void createThumbnail(original, thumb) {
+void createThumbnail(original, thumb, scale) {
 	thumb.dir.mkdirs()
-	execute 'convert', '-strip', original, '-thumbnail', '48x48', '-gravity', 'center', '-background', 'transparent', '-extent', '48x48', 'PNG8:' + thumb
+
+	def size = thumbnailSize*.multiply(scale).join('x')
+	execute 'convert', '-strip', original, '-thumbnail', size, '-gravity', 'center', '-background', 'transparent', '-extent', size, 'PNG8:' + thumb
 }
 
 
 void createIndexFile(db) {
 	def indexFile = _args.outputPath.resolve("images/${db}/thumb/poster/index.txt")
-	def index = indexFile.dir.listFiles{ it.image }.collect{ it.nameWithoutExtension as int }.toSorted()
+	def index = indexFile.dir.listFiles{ it.name =~ /\d+/ }.collect{ it.nameWithoutExtension as int }.toSorted()
 
 	index.join('\n').saveAs(indexFile)
 	execute 'xz', indexFile, '--force', '--keep'
@@ -46,55 +56,57 @@ void build(ids, section, db, query) {
 	def files = []
 
 	ids.each{ id ->
-		def original = getOriginalPath(section, id)
-		def thumb = getThumbnailPath(section, id)
+		scaleFactor.each { scale ->
+			def original = getOriginalPath(section, id)
+			def thumb = getThumbnailPath(section, id, scale)
 
-		if (thumb.exists()) {
-			log.finest "[SKIP] $id"
-			return
-		}
-
-		if (original.length() == 0 && original.exists() && System.currentTimeMillis() - original.lastModified() > 90 * 24 * 60 * 60 * 1000) {
-			log.finest "[SKIP] $id"
-			return
-		}
-
-		if (original.length() == 0 || !original.exists()) {
-			def artwork = retry(2, 60000) {
-				try {
-					return db.getArtwork(id, query, Locale.ENGLISH)
-				} catch (FileNotFoundException e) {
-					log.warning "[ARTWORK NOT FOUND] $e"
-					return null
-				}
+			if (thumb.exists()) {
+				log.finest "[SKIP] $id"
+				return
 			}
 
-			artwork?.findResult{ a ->
-				return retry(2, 60000) {
+			if (original.length() == 0 && original.exists() && System.currentTimeMillis() - original.lastModified() > 90 * 24 * 60 * 60 * 1000) {
+				log.finest "[SKIP] $id"
+				return
+			}
+
+			if (original.length() == 0 || !original.exists()) {
+				def artwork = retry(2, 60000) {
 					try {
-						log.fine "Fetch $a"
-						return a.url.saveAs(original)
+						return db.getArtwork(id, query, Locale.ENGLISH)
 					} catch (FileNotFoundException e) {
-						log.warning "[IMAGE NOT FOUND] $e"
+						log.warning "[ARTWORK NOT FOUND] $e"
 						return null
 					}
 				}
+
+				artwork?.findResult{ a ->
+					return retry(2, 60000) {
+						try {
+							log.fine "Fetch $a"
+							return a.url.saveAs(original)
+						} catch (FileNotFoundException e) {
+							log.warning "[IMAGE NOT FOUND] $e"
+							return null
+						}
+					}
+				}
+
+				// create empty placeholder if there is no artwork
+				if (original.length() == 0 || !original.exists()) {
+					original.createNewFile()
+					original.setLastModified(System.currentTimeMillis())
+				}
+
+				ls original
 			}
 
-			// create empty placeholder if there is no artwork
-			if (original.length() == 0 || !original.exists()) {
-				original.createNewFile()
-				original.setLastModified(System.currentTimeMillis())
+			if (original.length() > 0 && !thumb.exists()) {
+				createThumbnail(original, thumb, scale)
+				files << thumb
+
+				ls thumb
 			}
-
-			ls original
-		}
-
-		if (original.length() > 0 && !thumb.exists()) {
-			createThumbnail(original, thumb)
-			files << thumb
-
-			ls thumb
 		}
 	}