Ensure create has correct bit depth and colourspace #3139

docs/api-operation.md

@@ -289,6 +289,20 @@ Produce the "negative" of the image.
 
     *   `options.alpha` **[Boolean][6]** Whether or not to negate any alpha channel (optional, default `true`)
 
+### Examples
+
+```javascript
+const output = await sharp(input)
+  .negate()
+  .toBuffer();
+```
+
+```javascript
+const output = await sharp(input)
+  .negate({ alpha: false })
+  .toBuffer();
+```
+
 Returns **Sharp** 
 
 ## normalise

docs/changelog.md

@@ -4,6 +4,11 @@
 
 Requires libvips v8.12.2
 
+### v0.30.4 - TBD
+
+* Ensure `create` input image has correct bit depth and colour space.
+  [#3139](https://github.com/lovell/sharp/issues/3139)
+
 ### v0.30.3 - 14th March 2022
 
 * Allow `sharpen` options to be provided more consistently as an Object.