Turn the white background of an image into transparent

Hello everyone,

I would like from VBA to transform the white background of an image into transparent. I know the "transparent color" function exists but it does not show up with the macro recorder.

Can you help me ?

In addition, I was offered this formula:

But when I run the macro I am told that the value typed is out of range (line 6: TransparencyColor).

Cordially

Remi