Ensure create has correct bit depth and colourspace #3139

test/unit/negate.js

@@ -186,6 +186,22 @@ describe('Negate', function () {
       });
   });
 
+  it('negate create', async () => {
+    const [r, g, b] = await sharp({
+      create: {
+        width: 1,
+        height: 1,
+        channels: 3,
+        background: { r: 10, g: 20, b: 30 }
+      }
+    })
+      .negate()
+      .raw()
+      .toBuffer();
+
+    assert.deepStrictEqual({ r, g, b }, { r: 245, g: 235, b: 225 });
+  });
+
   it('invalid alpha value', function () {
     assert.throws(function () {
       sharp(fixtures.inputWebPWithTransparency).negate({ alpha: 'non-bool' });

test/unit/noise.js

@@ -19,7 +19,7 @@ describe('Gaussian noise', function () {
           sigma: 30
         }
       }
-    });
+    }).toColourspace('b-w');
     noise.toFile(output, function (err, info) {
       if (err) throw err;
       assert.strictEqual('png', info.format);
@@ -131,6 +131,7 @@ describe('Gaussian noise', function () {
       }
     });
     noise
+      .toColourspace('b-w')
       .toBuffer(function (err, data, info) {
         if (err) throw err;
         assert.strictEqual(1, info.channels);