Ensure images with P3 profiles retain full gamut #2862

test/fixtures/index.js

@@ -92,6 +92,7 @@ module.exports = {
   inputPngRGBWithAlpha: getPath('2569067123_aca715a2ee_o.png'), // http://www.flickr.com/photos/grizdave/2569067123/ (same as inputJpg)
   inputPngImageInAlpha: getPath('image-in-alpha.png'), // https://github.com/lovell/sharp/issues/1597
   inputPngSolidAlpha: getPath('with-alpha.png'), // https://github.com/lovell/sharp/issues/1599
+  inputPngP3: getPath('p3.png'), // https://github.com/lovell/sharp/issues/2862
 
   inputWebP: getPath('4.webp'), // http://www.gstatic.com/webp/gallery/4.webp
   inputWebPWithTransparency: getPath('5_webp_a.webp'), // http://www.gstatic.com/webp/gallery3/5_webp_a.webp

test/unit/colourspace.js

@@ -105,6 +105,25 @@ describe('Colour space conversion', function () {
       });
   });
 
+  it('Convert P3 to sRGB', async () => {
+    const [r, g, b] = await sharp(fixtures.inputPngP3)
+      .raw()
+      .toBuffer();
+    assert.strictEqual(r, 255);
+    assert.strictEqual(g, 0);
+    assert.strictEqual(b, 0);
+  });
+
+  it('Passthrough P3', async () => {
+    const [r, g, b] = await sharp(fixtures.inputPngP3)
+      .withMetadata({ icc: 'p3' })
+      .raw()
+      .toBuffer();
+    assert.strictEqual(r, 234);
+    assert.strictEqual(g, 51);
+    assert.strictEqual(b, 34);
+  });
+
   it('Invalid pipelineColourspace input', function () {
     assert.throws(function () {
       sharp(fixtures.inputJpg)