To compress and add a watermark to an image in the background in a React Native application, you can follow these steps:

Image Compression: Use libraries like react-native-image-crop-picker or react-native-image-resizer to compress the image before displaying it.

Adding Watermark: To add a watermark, use a library like react-native-canvas or react-native-skia to overlay the watermark on top of the image.

Implementation:

First, load the image and compress it. Use a Canvas or Skia to draw the watermark on the image. Save or display the modified image in your app.