---
name: "gcpSetIntensity"
section: "3"
platform: "linux"
package: "libggigcp1-dev"
version: "1.0.2+dfsg1-2"
release: "Debian 6.0 (Squeeze)"
platforms: ["linux"]
url: "https://new.carta.tech/gcpSetIntensity"
---

# gcpSetIntensity(3)

Manipulate Lighting

## NAME

**gcpSetIntensity**, **gcpGetIntensity** - Manipulate Lighting

## SYNOPSIS

```
#include <ggi/gcp.h>
gcp_pixel gcpSetIntensity(ggi_visual_t vis,
              const gcp_pixel *pix1, const gcp_pixel *light_color);
gcp_pixel gcpGetIntensity(ggi_visual_t vis,
              const gcp_pixel *pix1, const gcp_pixel *pix2);
```

## DESCRIPTION

**gcpSetIntensity** sets the intensity for a `gcp_pixel(3)`.

**gcpGetIntensity** extracts the intensity of a `gcp_pixel(3)`.

## RETURN VALUE

**gcpSetIntensity** returns a **[gcp\_pixel(3)](/gcp_pixel/3.md)** with the new light itensity.

**gcpGetIntensity** returns a **[gcp\_pixel(3)](/gcp_pixel/3.md)**, that corresponds the *light\_color* argument of **gcpSetIntensity**. The *pix1* is the same 'basecolor' passed to **gcpSetIntensity** and *pix2* corresponds the return value of **gcpSetIntensity**.