Have you read M$'s docs for whichever version of Excel you're using?

• Does Excel even support RYB scales?

Did you Google perl OLE?

• Those terms alone produce dozens of directly relevant links

Have you reviewed other options such as (CPAN/ActiveState/etc) modules directly related to Excel?

• No elaboration necessary, IMO

And, finally, if you haven't (and your OP makes it appear that you may not have), please read On asking for help, How do I post a question effectively? and I know what I mean. Why don't you?.