The doc.image() method must scale image by 72/96 to automatically convert pixels to points.

lib/mixins/images.js

@@ -36,24 +36,27 @@ export default {
       this.page.xobjects[image.label] = image.obj;
     }
 
-    let w = options.width || image.width;
-    let h = options.height || image.height;
+    const imageWidth = image.width * 0.75, // scale by 72/ 96 to convert from pixels to points.
+      imageHeight = image.height * 0.75;
+
+    let w = options.width || imageWidth,
+      h = options.height || imageHeight;
 
     if (options.width && !options.height) {
-      const wp = w / image.width;
-      w = image.width * wp;
-      h = image.height * wp;
+      const wp = w / imageWidth;
+      w = imageWidth * wp;
+      h = imageHeight * wp;
     } else if (options.height && !options.width) {
-      const hp = h / image.height;
-      w = image.width * hp;
-      h = image.height * hp;
+      const hp = h / imageHeight;
+      w = imageWidth * hp;
+      h = imageHeight * hp;
     } else if (options.scale) {
-      w = image.width * options.scale;
-      h = image.height * options.scale;
+      w = imageWidth * options.scale;
+      h = imageHeight * options.scale;
     } else if (options.fit) {
       [bw, bh] = options.fit;
       bp = bw / bh;
-      ip = image.width / image.height;
+      ip = imageWidth / imageHeight;
       if (ip > bp) {
         w = bw;
         h = bw / ip;
@@ -64,7 +67,7 @@ export default {
     } else if (options.cover) {
       [bw, bh] = options.cover;
       bp = bw / bh;
-      ip = image.width / image.height;
+      ip = imageWidth / imageHeight;
       if (ip > bp) {
         h = bh;
         w = bh * ip;

tests/unit/image.spec.js

@@ -0,0 +1,41 @@
+import PDFDocument from '../../lib/document';
+import { logData } from './helpers';
+
+describe('Image', () => {
+  let document;
+
+  beforeEach(() => {
+    document = new PDFDocument({ compress: false });
+  });
+
+  test('The image must be scaled to convert pixels to points', () => {
+    const docData = logData(document),
+      image = document.openImage('tests/images/bee.jpg'),
+      scale = 72 / 96;
+
+    const stream = Buffer.from(
+      `1 0 0 -1 0 792 cm
+q
+${image.width * scale} 0 0 -${image.height * scale} 72 372 cm
+/I1 Do
+Q
+`,
+      'binary'
+    );
+
+    document.image(image);
+    document.end();
+
+    expect(docData).toContainChunk([
+      '5 0 obj',
+      `<<
+/Length 55
+>>`,
+      'stream',
+      stream,
+      '\nendstream',
+      'endobj'
+    ]);
+  });
+
+});