# CAMERA_I2CEffect*

## Syntax

  `#include <twl/camera.h>`
  `CAMERAResult CAMERA_I2CEffect(CAMERASelect camera, CAMERAEffect effect);`
  `CAMERAResult CAMERA_I2CEffectAsync(CAMERASelect camera, CAMERAEffect effect, CAMERACallback callback, void *arg);`
  `CAMERAResult CAMERA_I2CEffectEx(CAMERASelect camera, CAMERAContext context, CAMERAEffect effect);`
  `CAMERAResult CAMERA_I2CEffectExAsync(CAMERASelect camera, CAMERAContext context, CAMERAEffect effect, CAMERACallback callback, void *arg);`

## Arguments

camera | Camera to configure (`CAMERA_SELECT_IN`, `CAMERA_SELECT_OUT`, or `CAMERA_SELECT_BOTH`).
context | Context to change.
effect | Effect to set.
callback | Function that is called when asynchronous processing has completed.
arg | Arguments when the callback function is invoked.

## Return Values

Returns `CAMERA_RESULT_SUCCESS` if configuration was successful.

## Description

Changes the camera effects.
The `CAMERA_I2CEffectEx` function is used to change the setting with the context specified. The non-Ex functions change the setting for both context A and B. See `CAMERAContext` for information on contexts.
Unlike `CAMERA_I2CEffect`, the `CAMERA_I2CEffectAsync` function returns control immediately and runs asynchronously. Use callback to confirm that processing has completed.
Note: When specifying an effect with this function, you can vary the result of the effect by changing another setting at the same time.

1. When `CAMERA_EFFECT_NEGAFILM` is specified, you can emphasize red tones by raising the color temperature of the white balance (`CAMERA_WHITE_BALANCE_SHADE`).
2. When `CAMERA_EFFECT_SEPIA` is set, a soft impression can be obtained by lowering the sharpness setting.

Note:
If camera settings are changed using any of the `CAMERA_I2C*` functions, the changes may be delayed for approximately one frame before they are applied. Consequently, note that if camera settings are changed while capturing, the application may not be able to get an updated image (an image with changes applied) at the time the application intended.

## See Also

`CAMERASelect`
`CAMERAContext`
`CAMERAEffect`
`CAMERACallback`
`CAMERAResult`

## Revision History

2009/03/25 Added a note on changes to camera settings during capture operations.
2008/10/30 Noted that `CAMERA_SELECT_BOTH` can also be specified.
2008/03/17 Added a description of combinations with other settings.
2007/10/12 Initial version.

CONFIDENTIAL