ImagickDraw
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ImagickDraw::setTextUnderColor

(PECL imagick 2.0.0)

ImagickDraw::setTextUnderColor — Specifies the color of a background rectangle

说明

bool ImagickDraw::setTextUnderColor ( ImagickPixel $under_color )
Warning

本函数还未编写文档，仅有参数列表。

Specifies the color of a background rectangle to place under text annotations.

参数

under_color

the under color

返回值

没有返回值。

ImagickDraw
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PHP手册 - N: Specifies the color of a background rectangle

用户评论:

www dot query at gmail dot com (08-Sep-2011 05:01)

When wishing to print some text on a photograph and make that text sufficiently contrasting to the background image, use a 4 byte code for colour and transparency.

It is the same 4 byte code using by the parameter '-undercolor' in ImageMagick's command lime instruction 'convert'.

The first 3 bytes are the RGB colour code and the fourth byte is the transparency byte.

<?php

    $draw = new ImagickDraw();
    $draw->setFillColor('#ffff00');
    $draw->setFont('Eurostile');
    $draw->setFontSize(21);
    $draw->setTextUnderColor('#ff000088');
    $picin->annotateImage($draw,40,$height-10,0,"Hallo");

?>

The example code produces yellow text on a semi-transparent red background.