> For the complete documentation index, see [llms.txt](https://docs.viesus.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.viesus.com/configuration/overview.md).

# Overview

All VIESUS on-premise interfaces (CLI, PDF Enhancer, Node.js module, C/C++ SDK) share the same **per-image enhancement** configuration file: `viesusini.json`. It defines how each image is enhanced — color, sharpening, AI upscaling, and the rest — and is documented in the [Parameter Reference](/configuration/parameter-reference.md).

{% hint style="success" %}
**You don't need to write one.** VIESUS enhances with sensible built-in defaults out of the box — if no `viesusini.json` is supplied, a default one is used for you. You only provide or edit a file when you want to change those defaults.
{% endhint %}

{% hint style="info" %}
**The PDF Enhancer uses two files.** `viesusini.json` controls the enhancement applied to each embedded image (as above). The PDF Enhancer *also* has its own top-level `settings.json` that governs the **PDF pipeline** — watched folders, triggers, file handling, and resizing of embedded images. The two are separate: `settings.json` points to a `viesusini.json` for the actual enhancement. See the [PDF Settings](/configuration/pdf-settings.md) reference.
{% endhint %}

***

## Where to start

For most workflows you don't need to edit the configuration file by hand:

* **Use a preset.** Pick the [preset](/configuration/presets-gallery.md) closest to your use case, download it, and run — no manual tuning needed for the common cases.
* **Tune interactively.** Load a preset (or the defaults) into the [VIESUS Viewer](/tools/viesus-viewer.md), open a representative image, and change parameters live with before/after preview. Export the resulting `viesusini.json`.
* **Edit the JSON directly.** When you know exactly which values you want, edit `viesusini.json` by hand — every parameter's type, default, and range is in the [Parameter Reference](/configuration/parameter-reference.md).


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