Hello,
I dont believe any DLP tool is able to detect this...as far as it is real steganography.
Steganography is a large domain which cover many ways to hide information in binary document (and not only image). So may be DLP will be able to cover some (one way could be by detecting usage of standard steganography tool on endpoint) but not all of them.
And there is always many ways to bypass DLP as it is not the ultimate tool to avoid data leakage, but it helps covering a large part of this risk for any company.
Regards