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Only way I see it happening is by

• Opening a general txt or xml data file
• Then open that txt file in OpenCV, write your communication
• Close txt file in OpenCV
• Read in data in VB and process
• Again close the file in VB (due to access rights)
• Open the changed data in OpenCV

However, you can edit RGB ( remember OpenCV uses BGR ) and HSV values through OpenCV, why go around using VB?