Merge pull request #142 from imagekit-developer/update-overlay-syntax

update overlay syntax

Author: imagekitio

README.md

@@ -278,6 +278,61 @@ transformation = [
 
 See the complete list of transformations supported in ImageKit [here](https://docs.imagekit.io/features/image-transformations). The SDK gives a name to each transformation parameter e.g. `height` for `h` and `width` for `w` parameter. It makes your code more readable. If the property does not match any of the following supported options, it is added as it is.
 
+### Adding overlays
+
+ImageKit.io enables you to apply overlays to [images](https://docs.imagekit.io/features/image-transformations/overlay-using-layers) and [videos](https://docs.imagekit.io/features/video-transformation/overlay) using the raw parameter with the concept of [layers](https://docs.imagekit.io/features/image-transformations/overlay-using-layers#layers). The raw parameter facilitates incorporating transformations directly in the URL. A layer is a distinct type of transformation that allows you to define an asset to serve as an overlay, along with its positioning and additional transformations.
+
+**Text as overlays**
+
+You can add any text string over a base video or image using a text layer (l-text).
+
+For example:
+
+```js
+<IKImage
+    path="/default-image.jpg"
+    transformation={[{ "width": 400, "height": 300 },{ "raw": "l-text,i-Imagekit,fs-50,l-end" }]}
+/>
+```
+**Sample Result URL**
+```
+https://ik.imagekit.io/your_imagekit_id/tr:h-300,w-400,l-text,i-Imagekit,fs-50,l-end/default-image.jpg
+```
+
+**Image as overlays**
+
+You can add an image over a base video or image using an image layer (l-image).
+
+For example:
+
+```js
+<IKImage
+    path="/default-image.jpg"
+    transformation={[{ "width": 400, "height": 300 },{ "raw": "l-image,i-default-image.jpg,w-100,b-10_CDDC39,l-end" }]}
+/>
+```
+**Sample Result URL**
+```
+https://ik.imagekit.io/your_imagekit_id/tr:h-300,w-400,l-image,i-default-image.jpg,w-100,b-10_CDDC39,l-end/default-image.jpg
+```
+
+**Solid color blocks as overlays**
+
+You can add solid color blocks over a base video or image using an image layer (l-image).
+
+For example:
+
+```js
+<IKVideo
+    path="/img/sample-video.mp4"
+    transformation={[{ "width": 400, "height": 300 },{ "raw": "l-image,i-ik_canvas,bg-FF0000,w-300,h-100,l-end" }]}
+/>
+```
+**Sample Result URL**
+```
+https://ik.imagekit.io/your_imagekit_id/tr:h-300,w-400,l-image,i-ik_canvas,bg-FF0000,w-300,h-100,l-end/img/sample-video.mp4
+```
+
 ### List of supported transformations
 <details>
 <summary>Expand</summary>
@@ -300,34 +355,6 @@ See the complete list of transformations supported in ImageKit [here](https://do
 | rotation | rt |
 | blur | bl |
 | named | n |
-| overlayX | ox |
-| overlayY | oy |
-| overlayFocus | ofo |
-| overlayHeight | oh |
-| overlayWidth | ow |
-| overlayImage | oi |
-| overlayImageTrim | oit |
-| overlayImageAspectRatio | oiar |
-| overlayImageBackground | oibg |
-| overlayImageBorder | oib |
-| overlayImageDPR | oidpr |
-| overlayImageQuality | oiq |
-| overlayImageCropping | oic |
-| overlayImageTrim | oit |
-| overlayText | ot |
-| overlayTextFontSize | ots |
-| overlayTextFontFamily | otf |
-| overlayTextColor | otc |
-| overlayTextTransparency | oa |
-| overlayAlpha | oa |
-| overlayTextTypography | ott |
-| overlayBackground | obg |
-| overlayTextEncoded | ote |
-| overlayTextWidth | otw |
-| overlayTextBackground | otbg |
-| overlayTextPadding | otp |
-| overlayTextInnerAlignment | otia |
-| overlayRadius | or |
 | progressive | pr |
 | lossless | lo |
 | trim | t |