What is the correct background color for work permit photos in Thailand?

There seems to be confusion regarding the required background color for work permit photos in Thailand. Some expats have provided conflicting information: while some report that their work permit photos were accepted with a white background, others have mentioned they used a blue background. Additionally, there have been discussions about different size requirements, with some suggesting that work permit photos should be smaller than regular visa photos, while others disagree. The consensus seems to recommend checking with the relevant authorities or photo service for the most accurate requirements.