Imagick::floodFillPaintImage

(PECL imagick 2 >= 2.3.0, PECL imagick 3)

Imagick::floodFillPaintImage — Changes the color value of any pixel that matches target

说明

public Imagick::floodFillPaintImage(
    mixed $fill,
    float $fuzz,
    mixed $target,
    int $x,
    int $y,
    bool $invert,
    int $channel = Imagick::CHANNEL_DEFAULT
): bool

Changes the color value of any pixel that matches target and is an immediate neighbor. This method is a replacement for deprecated Imagick::paintFloodFillImage(). 此方法在Imagick基于ImageMagick 6.3.8以上版本编译时可用。

参数

fill: ImagickPixel object or a string containing the fill color
fuzz: The amount of fuzz. For example, set fuzz to 10 and the color red at intensities of 100 and 102 respectively are now interpreted as the same color.
target: ImagickPixel object or a string containing the target color to paint
x: X start position of the floodfill
y: Y start position of the floodfill
invert: If true paints any pixel that does not match the target color.
channel: Provide any channel constant that is valid for your channel mode. To apply to more than one channel, combine channel constants using bitwise operators. 缺省为Imagick::CHANNEL_DEFAULT. 参考此通道常数列表

返回值

成功时返回 true。

示例

示例 #1 Imagick::floodfillPaintImage() example

<?php

/* Create new imagick object */
$im = new Imagick();

/* create red, green and blue images */
$im->newImage(100, 50, "red");
$im->newImage(100, 50, "green");
$im->newImage(100, 50, "blue");

/* Append the images into one */
$im->resetIterator();
$combined = $im->appendImages(true);

/* Save the intermediate image for comparison */
$combined->writeImage("floodfillpaint_intermediate.png");

/* The target pixel to paint */
$x = 1;
$y = 1;

/* Get the color we are painting */
$target = $combined->getImagePixelColor($x, $y);

/* Paints pixel in position 1,1 black and all neighboring 
   pixels that match the target color */
$combined->floodfillPaintImage("black", 1, $target, $x, $y, false);

/* Save the result */
$combined->writeImage("floodfillpaint_result.png");
?>

以上示例的输出类似于：

Output of example : Imagick::floodfillPaintImage()

＋add a note

User Contributed Notes 1 note

down

Anonymous ¶

5 years ago

For fuzz, percentage or float values do not seem to work. The value is based on the intensity of the image colors. 

The documentation states: "The amount of fuzz. For example, set fuzz to 10 and the color red at intensities of 100 and 102 respectively are now interpreted as the same color." 

For those of us who are not graphics geeks, your color intensity might be something like 65535. In which case, to get just 10% fuzz, you need to set it to 6550. 

You likely will not see any effect if you are using low numbers or floats, like 100, 20, or 0.8. 

For example: 
$im = new Imagick();
$transparentColor = new ImagickPixel('transparent');
$greenscreen = '#00FF08';    // Super bright green

$im->readImage("cartoon_dog.png");    // Cartoony dog with a black outline and a #00FF08 (super bright green) background. 

// Replace the green background with transparent.

// Leaves significant green lines around the outline of the dog, which is unacceptable.
$im->floodFillPaintImage($transparentColor, 30, $greenscreen, 0, 0, false, Imagick::CHANNEL_ALPHA);

// Works as intended - removes all of the green background. 
$im->floodFillPaintImage($transparentColor, 30000, $greenscreen, 0, 0, false, Imagick::CHANNEL_ALPHA);

Credit to the discussion here: 
https://php5.kiev.ua/php7/imagick.painttransparentimage.html

＋add a note