PHP: imagecolorexactalpha - Manual

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Last updated: Fri, 26 Jan 2007

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# imagecolorexactalpha

(PHP 4 >= 4.0.6, PHP 5)

imagecolorexactalpha -- Get the index of the specified color + alpha

## Описание

int imagecolorexactalpha ( resource image, int red, int green, int blue, int alpha )

Returns the index of the specified color+alpha in the palette of the image.

## Список параметров

`image`

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

`red`

  Value of red component

`green`

  Value of green component

`blue`

  Value of blue component

`alpha`

  A value between `0` and `127`. `0` indicates completely opaque while `127` indicates completely transparent.

The colors parameters are integers between 0 and 255 or hexadecimals between 0x00 and 0xFF.

## Возвращаемые значения

Returns the index of the specified color+alpha in the palette of the image, or -1 if the color does not exist in the image's palette.

## Примечания

> Замечание: Эта функция нуждается в GD версии 2.0.1 или выше.

## Смотрите также

imagecolorclosestalpha()

add a note User Contributed Notes
imagecolorexactalpha
matt at matt-darby dot com
11-Jul-2005 06:09
`Note that a color allocated with imagecolorexactalpha won't show alpha (it will be opaque) when used with imageline(). Use imagerectangle() set to your normal start and end points instead.
Ensure that the image is created via imagecreatetruecolor() as well!`
phpdoc-comment at aditus dot nu
08-Nov-2002 10:01
`What might be misleading in the docs is that if the specified color + alpha channel does not exist it will be created. So if you like to use an alpha channel in your image enable alpha blending and then create you color using this method.`
add a note
imagecolormatch imagecolorexact

Last updated: Fri, 26 Jan 2007
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