## vrt.create_rgba_vrt()


Create a 4-band uint8 RGBA VRT colour-mapping a raster through lookup tables.


Usage

``` python
vrt.create_rgba_vrt(
    src_path,
    output_vrt,
    *,
    luts,
    src_bands=(1, 1, 1),
)
```


Each colour band reads one source band through its own piecewise-linear `LUT`. Alpha is 255 except at NODATA, which is skipped and so stays at the band's zero initialisation - transparent, letting a tiler drop empty tiles.


## Parameters


`src_path: str | Path | UPath`  
Source raster; may be a VRT.

`output_vrt: str | Path | UPath`  
Output VRT.

`luts: Sequence[Sequence[tuple[float, int]]]`  
One table per colour band: `(source value, output 0-255)` pairs, in ascending source order.

`src_bands: Sequence[int] = (1, 1, 1)`  
Source band each of R, G and B reads. `(1, 1, 1)` colour-maps one single-band raster; `(1, 2, 3)` maps the three bands of an RGB source.


## Raises


`ValueError`  
If `luts` or `src_bands` does not hold exactly three entries.