GD Функции
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imagetruecolortopalette

(PHP 4 >= 4.0.6, PHP 5)

imagetruecolortopaletteConvert a true color image to a palette image

Описание

bool imagetruecolortopalette ( resource $image , bool $dither , int $ncolors )

imagetruecolortopalette() converts a truecolor image to a palette image. The code for this function was originally drawn from the Independent JPEG Group library code, which is excellent. The code has been modified to preserve as much alpha channel information as possible in the resulting palette, in addition to preserving colors as well as possible. This does not work as well as might be hoped. It is usually best to simply produce a truecolor output image instead, which guarantees the highest output quality.

Параметри

image

Ресурс на изображение, върнат от някоя от функциите за създаване на изображения като например imagecreatetruecolor().

dither

Indicates if the image should be dithered - if it is TRUE then dithering will be used which will result in a more speckled image but with better color approximation.

ncolors

Sets the maximum number of colors that should be retained in the palette.

Връщани стойности

Връща TRUE при успех или FALSE при неуспех.

Примери

Example #1 Converting a true color image to a palette-based image

<?php
// Create a new true color image
$im = new imagecreatetruecolor(100100);

// Convert to palette-based with no dithering and 255 colors
imagetruecolortopalette($imfalse255);

// Save the image
imagepng($im'./paletteimage.png');
imagedestroy($im);
?>

Бележки

Забележка: Тази функция изисква GD 2.0.1 или по-нова (препоръчва се 2.0.28 или по-нова).


GD Функции
PHP Manual