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Assuming that the image is stored in the database as a BLOB type, below are the steps to display it as a background in Laravel:

1. Retrieve the image data from the database.

2. Create a new image object using the retrieved data.

3. Determine the image dimensions (width and height) and calculate the aspect ratio.

4. Set the image as the background using CSS in the blade template.

The code below demonstrates how to accomplish these steps in a Laravel application:

//Retrieve the image data from the database
$imageData = DB::table('images')->where('id', $id)->pluck('data')->first();

//Create a new image object using the retrieved data
$image = imagecreatefromstring($imageData);

//Determine the image dimensions and calculate the aspect ratio
$width = imagesx($image);
$height = imagesy($image);
$aspectRatio = $width / $height;

//Set the image as the background using CSS in the blade template
<style>
  body {
    background-image: url(data:image/jpeg;base64,{{ base64_encode($imageData) }});
    background-size: cover;
    background-repeat: no-repeat;
    background-position: center;
  }
</style>

Note that the code above assumes that the image is in JPEG format. If the image is in a different format, you need to change the image MIME type (e.g., image/png, image/gif, etc.) and the base64 encoding function accordingly.