> 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/features/features/background-handling.md).

# Background Handling

AI segmentation separates the subject from the background. Can add an alpha channel, replace the background with a solid color or custom image, or apply balancing between foreground and background.

## Example

{% columns %}
{% column %}
**Before**

<figure><img src="https://919968377-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FG3eQlcnlDKtn9yl3mxsx%2Fuploads%2Fgit-blob-2aac38d3a6989f640b75c2aeecf11934ec13a3c3%2Fplaceholder.svg?alt=media" alt="Before — Background Handling"><figcaption></figcaption></figure>
{% endcolumn %}

{% column %}
**After**

<figure><img src="https://919968377-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FG3eQlcnlDKtn9yl3mxsx%2Fuploads%2Fgit-blob-2aac38d3a6989f640b75c2aeecf11934ec13a3c3%2Fplaceholder.svg?alt=media" alt="After — Background Handling"><figcaption></figcaption></figure>
{% endcolumn %}
{% endcolumns %}

## Parameters

<table><thead><tr><th width="138.4000244140625">Parameter</th><th width="100">Section</th><th width="95">Value</th><th width="95">Default</th><th>Description</th></tr></thead><tbody><tr><td><code>BGmode</code></td><td><code>Config</code></td><td>0 – 4</td><td>0</td><td>Mode selection (see below)</td></tr><tr><td><code>BGBalmode</code></td><td><code>Config</code></td><td>0 – 3</td><td>0</td><td>Balancing: <strong>0</strong> = off, <strong>1</strong> = to first, <strong>2</strong> = strict, <strong>3</strong> = to parameters</td></tr><tr><td><code>ReplacePath</code></td><td><code>Background</code></td><td>String</td><td>—</td><td>Path to a replacement background image (mode 3)</td></tr><tr><td><code>backgroundR</code></td><td><code>Background</code></td><td>0 – 255</td><td>255</td><td>Red component for solid-color replacement</td></tr><tr><td><code>backgroundG</code></td><td><code>Background</code></td><td>0 – 255</td><td>255</td><td>Green component for solid-color replacement</td></tr><tr><td><code>backgroundB</code></td><td><code>Background</code></td><td>0 – 255</td><td>255</td><td>Blue component for solid-color replacement</td></tr><tr><td><code>balanceH</code></td><td><code>Background</code></td><td>-1.0 – 1.0</td><td>0.0</td><td>Hue balance adjustment</td></tr><tr><td><code>balanceS</code></td><td><code>Background</code></td><td>-1.0 – 1.0</td><td>0.0</td><td>Saturation balance adjustment</td></tr><tr><td><code>balanceV</code></td><td><code>Background</code></td><td>-1.0 – 1.0</td><td>0.0</td><td>Value balance adjustment</td></tr></tbody></table>

## Modes

<table><thead><tr><th width="277.199951171875">Value</th><th>Description</th></tr></thead><tbody><tr><td><strong>0</strong> — Off</td><td>No background handling</td></tr><tr><td><strong>1</strong> — Alpha channel</td><td>Background made transparent</td></tr><tr><td><strong>2</strong> — Solid color replacement</td><td>Background replaced with <code>backgroundR/G/B</code></td></tr><tr><td><strong>3</strong> — Image replacement</td><td>Foreground composited onto <code>ReplacePath</code></td></tr><tr><td><strong>4</strong> — Alpha + solid color</td><td>Pre-composited RGBA</td></tr></tbody></table>

{% hint style="success" %}
**Recommended:** Leave off (mode 0) for standard enhancement. Enable only for cut-outs or background replacement — Mode 1 for transparency, Mode 2 for a solid studio backdrop.
{% endhint %}

{% hint style="warning" %}
**Output format:** Save as PNG or TIFF to preserve transparency. JPEG does not support alpha — modes 1 and 4 require a transparency-capable format.
{% endhint %}


---

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