I have customized the PDF invoice report, all working OK. However, the printer printing the invoices only prints in black and white. The company logo is pre-printed on the paper, in color. So I want to hide or remove the logo, but I want preserve the logo when a PDF invoice is sent by e-mail.

Because invoices should not be modified and the reports are stored and retrieved when reprinting, this could get pretty difficult. Maybe it is a better option to disable this feature and create a separate report. Or would it be better to alter the report without any logo at all and than customize the already generated report with a background image for the logo in code in a module customizing the mail behavior?