Imagick: compose with mask

try using compositeImage method and Imagick::COMPOSITE_COPYOPACITY


Try this code:

// x-displacement
$a3->setImageArtifact('compose:args', "312x0");
$a1->compositeImage($a3, Imagick::COMPOSITE_DISPLACE, 0, 0);

// y-displacement
$a4->setImageArtifact('compose:args', "0x26.6776");
$a1->compositeImage($a4, Imagick::COMPOSITE_DISPLACE, 0, 0);

I do not know if this will help, but I processed your images in ImageMagick 6.9.10.62 and 6.9.10.5 Q16 Mac OSX with the same result as shown below.

So if there is an issue, it is likely with Imagick.

What was your exact version of 6.9.10.x?

convert img.png \
\( dx.png dy.png dy.png -combine \) \
-define compose:args=312x26.6776 -compose displace -composite \
result.png


enter image description here

I notice that if the same image dx is combined for dy, then I get a result similar to your bad result. That might mean that either the addImage or the flattenImage or the combineImage is not working correctly in your new Imagick.

convert img.png \
\( dx.png dx.png dy.png -combine \) \
-define compose:args=312x26.6776 -compose displace -composite \
result2.png


enter image description here

Check your code to be sure you do not have a typo using $a3, $a3, and either $a3 or $a4 for your addImage.

For a test, try PHP 

exec("convert img.png \( dx.png dy.png dy.png -combine \) -define compose:args=312x26.6776 -compose displace -composite result.png")

After struggling with this I finally found a way how to do it properly with PHP-Imagick.

// merge x-displacement and y-displacement into one displacement-map
$displaceMask = new Imagick();
$displaceMask->addImage($a3);
$displaceMask->addImage($a4);
$displaceMask->addImage($a4);
$displaceMask->flattenImages();
$displaceMask = $displaceMask->combineImages(Imagick::CHANNEL_ALL);

$displaceMask->setImageArtifact('compose:args', '312x26.6776');
$a1->compositeImage($displaceMask, Imagick::COMPOSITE_DISPLACE, 0, 0);

Resources that I used:

  • https://github.com/mkoppanen/imagick/issues/49
  • https://www.imagemagick.org/discourse-server/viewtopic.php?f=3&t=26323
  • Merging RGB channels back into a single image with ImageMagick (php)
  • https://imagemagick.org/script/command-line-options.php#combine

Tags:

Php

Composite

Mask

Transformation

Imagick

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