---
name: "Imager::File::JPEG"
section: "3pm"
platform: "linux"
package: "libimager-perl"
version: "1.027+dfsg-1"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/Imager::File::JPEG"
---

# Imager::File::JPEG(3pm)

read and write JPEG files

## NAME

Imager::File::JPEG - read and write JPEG files

## SYNOPSIS

```
  use Imager;
  my $img = Imager->new;
  $img->read(file=>"foo.jpg")
    or die $img->errstr;
  $img->write(file => "foo.jpg")
    or die $img->errstr;
  my $version = Imager::File::JPEG->libjpeg_version();
  if (Imager::File::JPEG->is_turbojpeg) { ... }
  if (Imager::File::JPEG->is_mozjpeg) { ... }
  if (Imager::File::JPEG->has_arith_coding) { ... }
```

## DESCRIPTION

Imager's JPEG support is documented in Imager::Files.

Besides providing JPEG support, Imager::File::JPEG has the following methods:

- **libjpeg\_version()**

  ```
    Imager::File::JPEG->libjpeg_version();
  ```

  Returns version information about the variety of `"libjpeg"` Imager::File::JPEG was compiled with.  This is determined at build time.  This includes:

  - •

    The library type, one of `"libjpeg"`, `"libjpeg-turbo"` or `"mozjpeg"`.

  - •

    `"version"` followed by the library version number.

  - •

    `"api"` followed by the `"libjpeg"` API version.

  For `"libjpeg"` the API and library versions are always equal.

- **is\_turbojpeg()**

  ```
    Imager::File::JPEG->is_turbojpeg();
  ```

  Returns true if Imager::File::JPEG was built with `"libjpeg-turbo"`. Note that `"mozjpeg"` is built on top of `"libjpeg-turbo"` so this will return true for `"mozjpeg"`.

- **is\_mozjpeg()**

  ```
    Imager::File::JPEG->is_mozjpeg();
  ```

  Returns true if Imager::File::JPEG was built with `"mozjpeg"`.  Note that `"mozjpeg"` doesn't define its own version numbering, so `"mozjpeg"` is detected by defines that only `"mozjpeg"` currently defines.

- **has\_arith\_coding()**

  Returns true if the `"libjpeg"` variant `"Imager::File::JPEG"` was built with has both encoding and decoding support for arithmetic coding.

- **has\_encode\_arith\_coding()**

  Returns true if the `"libjpeg"` variant `"Imager::File::JPEG"` was built with has encoding support for arithmetic coding.

- **has\_decode\_arith\_coding()**

  Returns true if the `"libjpeg"` variant `"Imager::File::JPEG"` was built with has decoding support for arithmetic coding.

## AUTHOR

Tony Cook \<tonyc@cpan.org\>

## SEE ALSO

Imager, Imager::Files.