Limiting the error_log

Is there any way to stop 404 errors being logged in the error_log file
on Apache?

Basically I'm generating a deliberate 404 error, and using a .htaccess
file and a request_url to redirect the request to a specific file
(don't ask why ... it's related to Mac computers and image files!). I
just don't want these 404 errors filling up my Apache error_log.

These are really the only errors that I don't want logged, is there any
way of doing this?

Thanks for your help.

Thanks for your reply ... however it doesn't seem to help. I have
looked at the documentation and with regards to the error_log, it says:
"It is not possible to customize the error log by adding or removing
information"
Conditional logging works with the access_log, not the error_log
(according to the documentation),
So, any other thoughts on preventing 404 errors being logged in the
error_log?

Thanks for that - you are right, this looks like the approach we should
take. I had looked at the documentation (which is where I got the quote
"It is not possible to customize the error log by adding or removing
information") - and because I believed that I didn't think that you
could in fact use a pipe to customize the error log.

I'll give it a try, and thanks again for your help.