The `LINEAR_BGRX5551` field is a member of the `ImageFormat` enumeration in the Sandbox namespace. This field represents an image format where the color data is stored in a linear color space with a BGRX (Blue, Green, Red, and unused) channel order. The format uses 16 bits per pixel, with 5 bits for each of the blue, green, and red channels, and 1 bit unused (often used for padding or alignment purposes).

This image format is typically used when you need to store images with a specific color channel order and bit depth, particularly in graphics programming where linear color space is required for accurate color representation. It is important to ensure that your graphics pipeline or rendering system supports this format before using it.

// Example of using the LINEAR_BGRX5551 image format
ImageFormat format = ImageFormat.LINEAR_BGRX5551;

// Check if the format is supported
if (IsFormatSupported(format))
{
    // Use the format for image processing or rendering
    ProcessImageWithFormat(format);
}