(PECL imagick 2 >= 2.3.0, PECL imagick 3)
Imagick::floodFillPaintImage — Changes the color value of any pixel that matches target
$fill,$fuzz,$target,$x,$y,$invert,$channel = Imagick::CHANNEL_DEFAULTChanges the color value of any pixel that matches target and is an immediate neighbor. This method is a replacement for deprecated Imagick::paintFloodFillImage() . This method is available if Imagick has been compiled against ImageMagick version 6.3.8 or newer.
fillImagickPixel object or a string containing the fill color
fuzzThe 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.
targetImagickPixel object or a string containing the target color to paint
xX start position of the floodfill
yY 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. Defaults to Imagick::CHANNEL_DEFAULT . Refer to this list of channel constants
Returns true on success.
Example #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");
?>The above example will output something similar to:
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