What is Imagick equivalent of following Imagemagick command?

Question

What is the Imagick equivalent of following Imagemagick command?

convert i.jpg -set colorspace RGB ( -clone 0 -fill black -colorize 100% ) ( -clone 0 colorspace gray -negate ) -compose blend -define compose:args=70,30 -composite o.jpg

I did the following Imagick commands, but it doesnt seem to be the same

$img = new Imagick("i.jpg");
$img->setImageColorspace(Imagick::COLORSPACE_RGB);
$clone1 = $img->clone();
$clone1->colorizeImage('black', 1.0);
$clone2 = $img->clone();
$clone2->setImageColorspace(Imagick::COLORSPACE_GRAY);
$clone2->negateImage(0);
$img->setOption('compose:args', '70x30');
$img->compositeImage($clone1, Imagick::COMPOSITE_BLEND, 0, 0);
$img->compositeImage($clone2, Imagick::COMPOSITE_BLEND, 0, 0);
$img->writeImage("o.jpg");

Where have I made mistakes?

Answer 1

For the most part, what you have is correct. Two minor issues will need to be addressed to match the CLI result.

First

Move the setOption line before reading any images in the Imagick object.

$img = new Imagick();
$img->setOption('compose:args', '70x30');
$img->readImage("i.jpg");
// ...

Secound

Colorizing the black color to 100% usually results in a solid black image. For whatever reason, there's no effect with MagickColorizeImage method. There's some work-arounds using ImagickDraw & background-color assignment listed within the comments on PHP.net's documentation. I'd recommend revisiting your first $clone1 image.