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.
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.
- PHP Руководство
- Функции по категориям
- Индекс функций
- Справочник функций
- Обработка и генерация изображений
- Обработка изображений и GD
- gd_info
- getimagesize
- getimagesizefromstring
- image_type_to_extension
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- image2wbmp
- imageaffine
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- imageaffinematrixget
- imagealphablending
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- imagearc
- imagechar
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- imagecolorallocate
- imagecolorallocatealpha
- imagecolorat
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- imagecolorclosesthwb
- imagecolordeallocate
- imagecolorexact
- imagecolorexactalpha
- imagecolormatch
- imagecolorresolve
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- imagecolorset
- imagecolorsforindex
- imagecolorstotal
- imagecolortransparent
- imageconvolution
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- imagelayereffect
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- imagepng
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- imagepsencodefont
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- imagepsfreefont
- imagepsloadfont
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- imagepstext
- imagerectangle
- imagerotate
- imagesavealpha
- imagescale
- imagesetbrush
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- imagesettile
- imagestring
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- imagesx
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- imagetruecolortopalette
- imagettfbbox
- imagettftext
- imagetypes
- imagewbmp
- imagewebp
- imagexbm
- iptcembed
- iptcparse
- jpeg2wbmp
- png2wbmp
Коментарии
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.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!