PHP: imagegammacorrect - Manual

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Last updated: Fri, 26 Jan 2007

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# imagegammacorrect

(PHP 3 >= 3.0.13, PHP 4, PHP 5)

imagegammacorrect -- Apply a gamma correction to a GD image

## Описание

bool imagegammacorrect ( resource image, float inputgamma, float outputgamma )

Applies gamma correction to the given gd `image` given an input and an output gamma.

## Список параметров

`image`

  An image resource, returned by one of the image creation functions, such as imagecreatetruecolor().

`inputgamma`

  The input gamma

`outputgamma`

  The output gamma

## Возвращаемые значения

Возвращает `TRUE` в случае успешного завершения или `FALSE` в случае возникновения ошибки.

add a note User Contributed Notes
imagegammacorrect
brian dot duncan at fife dot co dot uk
26-Jan-2002 05:46
`Just thought I'd add how I used the gamma correction function (seeing as no-one had done so previously). works great.
I used a form which has a parameter $GAMMA, so I usually type in something like 1.6
$image = ImageCreateFromJpeg ( "pictures/".$PICTURE2 ) ;
if ($GAMMA != "")
{
$GammaFloat = (double) $GAMMA ;
imagegammacorrect ($image, 1.0, $GammaFloat ) ;
// now save the file
imagejpeg ( $image, "pictures/"."$PICTURE2", 90 ) ;
}`
add a note
imagegd2 imagefttext

Last updated: Fri, 26 Jan 2007
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