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Here is an example process for converting an image from a backend server into a byte array and displaying it as the background image in an HTML DIV style in Angular:

1. Use the HttpClient module to make a GET request to the backend server to retrieve the image file.
2. Convert the image data into a byte array using the FileReader API. This can be achieved using the following code:

const reader = new FileReader();
reader.onloadend = () => {
  const bytes = new Uint8Array(reader.result as ArrayBuffer);
  // Use the byte array to set the background image style
};
reader.readAsArrayBuffer(imageData);

1. After the byte array is obtained, use it to set the background image style on the HTML DIV element. This can be done using the following code:

const divElement = document.getElementById('my-div');
divElement.style.backgroundImage = `url("data:image/jpeg;base64,${btoa(String.fromCharCode.apply(null, bytes))}")`;

In this example, "my-div" is the ID of the HTML DIV element, and the byte array is converted into a base64-encoded string to be used in the "url" parameter of the background image style.