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Tech review of libjpeg install guide #3994

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22 changes: 14 additions & 8 deletions content/install-guides/libjpeg-turbo.md
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Expand Up @@ -19,9 +19,10 @@ layout: installtoolsall

## Overview

[libjpeg-turbo](https://www.libjpeg-turbo.org/) provides JPEG encoding and decoding libraries and
command-line tools. The tools include `cjpeg` for encoding, `djpeg` for decoding, and `jpegtran`
for transforming JPEG images.
[libjpeg-turbo](https://www.libjpeg-turbo.org/) is a JPEG image codec that uses single instruction,
multiple data (SIMD) instructions
to accelerate JPEG encoding and decoding. It provides libraries and command-line tools,
including `cjpeg` for encoding, `djpeg` for decoding, and `jpegtran` for transforming JPEG images.

You can install the tools on macOS on Apple silicon, 64-bit Arm Linux, or Windows on Arm.
Package-manager commands on macOS and Linux install the version available from your package source.
Expand All @@ -37,6 +38,8 @@ brew install jpeg-turbo

## Install on Arm Linux

Use the commands for your Linux distribution.

On Ubuntu and Debian, install the `libjpeg-turbo-progs` package:

```console
Expand All @@ -57,20 +60,23 @@ runtime library doesn't provide these tools.

{{% notice Note %}}
The following steps use libjpeg-turbo version 3.1.4.1. You can use another version that provides
a native ARM64 installer. Replace the installer with the file for your chosen version.
an ARM64 installer. Replace the installer with the file for your chosen version.
To find the latest version, see [libjpeg-turbo releases](https://github.com/libjpeg-turbo/libjpeg-turbo/releases).
{{% /notice %}}

1. Download `libjpeg-turbo-3.1.4.1-vc-arm64.exe` from the
[libjpeg-turbo 3.1.4.1 release](https://github.com/libjpeg-turbo/libjpeg-turbo/releases/tag/3.1.4.1).
2. Run the installer and note the installation directory.
3. Add the installation's `bin` directory, containing `jpegtran.exe`, to your user's `Path`
environment variable.
4. Open a new PowerShell window so it picks up the change.
3. Open the installation directory in File Explorer. Open its `bin` folder and confirm that
it contains `jpegtran.exe`. Copy the full path to this folder from the address bar.
4. Search the Start menu for **Edit environment variables for your account** and open it.
5. Under **User variables**, select **Path**, then **Edit > New**. Paste the path to the
`bin` folder. Select **OK** to save and close the dialogs.
6. Open a new PowerShell window to use the updated `Path`.

## Verify the installation

Print the installed version:
In your terminal, or PowerShell on Windows, print the installed version:

```console
jpegtran -version
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