As stated before, any product field can have one picture assigned to it. The same picture can be referenced by many fields, and many products, in several languages.
Pictures are uploaded to Mediablob by calling UploadImage2 or UploadAndClipImage. When an image is uploaded, its md5 hashCode is returned. Use this hashCode as future reference in products.
To reduce bandwidth usage, api users are encouraged to calculate the md5 hash code themselves and check if the image exists in Mediablob through the ImageExists or ImageExistsMd5 functions prior to uploading images.
Note: Images are always hashed before being processed by Mediablob services, so it can be correctly precalculated before uploading.
Note: It is not possible to delete images in Mediablob through the API.