From f682a3d305bcdbfc26ef8562dc6965edd6f08ca4 Mon Sep 17 00:00:00 2001
From: mayurchoksi <mayurchoksi@gmail.com>
Date: Thu, 27 Dec 2018 16:45:00 -0500
Subject: [PATCH] Resolved "No decode delegate for this image format" when
 converting the full PDF (all pages) to png

Exception encountered when running
- Alpine in Docker container.
- Node 10
- Imagemagick
- pdf-image 2.0.0
---
 index.js | 22 ++++++++++++++++------
 1 file changed, 16 insertions(+), 6 deletions(-)

diff --git a/index.js b/index.js
index 4fa6231..927beab 100644
--- a/index.js
+++ b/index.js
@@ -85,12 +85,22 @@ PDFImage.prototype = {
     var pdfFilePath = this.pdfFilePath;
     var outputImagePath = this.getOutputImagePathForPage(pageNumber);
     var convertOptionsString = this.constructConvertOptions();
-    return util.format(
-      "%s %s\"%s[%d]\" \"%s\"",
-      this.useGM ? "gm convert" : "convert",
-      convertOptionsString ? convertOptionsString + " " : "",
-      pdfFilePath, pageNumber, outputImagePath
-    );
+    
+    if(util.types.isNumberObject(pageNumber)) {
+      return util.format(
+        "%s %s\"%s[%d]\" \"%s\"",
+        this.useGM ? "gm convert" : "convert",
+        convertOptionsString ? convertOptionsString + " " : "",
+        pdfFilePath, pageNumber, outputImagePath
+      );
+    } else {
+      return util.format(
+        "%s %s\"%s\" \"%s\"",
+        this.useGM ? "gm convert" : "convert",
+        convertOptionsString ? convertOptionsString + " " : "",
+        pdfFilePath, outputImagePath
+      );
+    }
   },
   constructCombineCommandForFile: function (imagePaths) {
     return util.format(