Are you manually inserting the ANSI sequences into the stream? Or are you using a library that does this for you? Often times libraries that let you specify ou

Are you manually inserting the ANSI sequences into the stream? Or are you using a library that does this for you? Often times libraries that let you specify output color will helpfully query the capabilities of the output device, and avoid writing the control codes if it’s (for example) a plain text file.