ON/IN FILM

[5jj]

As a native speaker I would never use "in" in the above sentence.

I agree - never

"The book came out on film" is common in North America but, based on what other members have said, odd sounding or incorrect elsewhere.
As I said in post #6, I wouldn't use it, but I have heard and seen it.

5

[bhaisahab]

But, "The book came out in film" could be used in limited circumstances?

No, never.

[emsr2d2]

But, "The book came out in film" could be used in limited circumstances?

I have never heard this and would never use it. It sounds completely wrong.

I agree with all other suggestions.

The book was made into a film.
They made a film of the book.
It came out on film.
The film is coming out on DVD next month.

[5jj]

That's four nevers in a row.

I have little doubt that someone will now produce evidence of someone using it somewhere.

[emsr2d2]

That's four nevers in a row.

I have little doubt that someone will now produce evidence of someone using it somewhere.

That's why I avoided "It's never used".