Filenames like "dlux" followed by a number are often internal naming conventions used by specific:
Once I have a visual or descriptive context, I can identify the photographer, the brand, or the publication where the full feature appeared. dlux01053.jpg
To help you find the original source or the full set of images, could you or describe the subject matter (e.g., a specific model, clothing brand, or car)? Filenames like "dlux" followed by a number are
As unique identifiers for digital assets. I can identify the photographer
For cataloging product shots (often luxury or "deluxe" items).
To track raw files or proofs from a specific shoot.