intervention

Replace a color in intervention image

I want to convert a user-uploaded image to a page background, by merging it with the background color.

To do that effect, I wanted to set the image to grayscale, then replacing the colors to match my background color (which is orange), so I wanted to replace the colorss (black matching my background's color, then each gray level faded to another clearer value).

The grescale() method is OK, but I don't know how to make the replacement. I tried the colorize function, but it only seems to brighten the image too much, even if I darken the image before with contrast(). LimitColors() didn't work neither.

How could I get the effect I want ?

Solution

  • I managed to get the display I wanted, using this method :

    Using intervention's filters to make it easier to use elsewhere, here's my result :

    <?php

namespace App\ImageFilters;

use Intervention\Image\Filters\FilterInterface;
use Intervention\Image\Image;
use Intervention\Image\ImageManager;

class MyFilter implements FilterInterface
{
    /** @var ImageManager */
    private $imageManager;

    const BACKGROUND_COLOR = '#FCB65B';

    public function __construct()
    {
        $this->imageManager = new ImageManager();
    }

    public function applyFilter(Image $image)
    {
        $height = $image->getHeight();
        $width = $image->getWidth();

        return $this->imageManager
            ->canvas($width, $height)
            ->fill(self::BACKGROUND_COLOR)
            ->mask($image, false);
    }

}

    It's used like this in my image management script:

    $image = $image->filter(New MyFilter());

    Edit before posting: