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Change logic of encoding indexed PNG format

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Oliver Vogel 2024-08-11 11:19:47 +02:00
parent 50feb11dce
commit 568444c939
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GPG Key ID: 1B19D214C02D69BB
1 changed files with 20 additions and 25 deletions
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45
src/Drivers/Imagick/Encoders/PngEncoder.php
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@ -47,36 +47,31 @@ class PngEncoder extends GenericPngEncoder implements SpecializedInterface
*/
private function prepareOutput(ImageInterface $image): Imagick
{
if ($this->indexed === false) {
$output = clone $image->core()->native();
$output = clone $image;
// ensure to encode PNG image type 6 (true color alpha)
$output->setFormat('PNG32');
$output->setImageFormat('PNG32');
if ($this->indexed) {
// reduce colors
$output->reduceColors(256);
$output = $output->core()->native();
$output->setFormat('PNG');
$output->setImageFormat('PNG');
// $output->setImageBackgroundColor(new \ImagickPixel('#00ff00'));
// $output->setImageProperty();
// $output->setType(Imagick::IMGTYPE_PALETTEMATTE);
// $output->setOption('png:bit-depth', '8');
// $output->setOption('png:color-type', '4');
return $output;
}
// get blending color
$blendingColor = $this->driver()->colorProcessor($image->colorspace())->colorToNative(
$this->driver()->handleInput($this->driver()->config()->blendingColor)
);
// create new image with blending color as background
$output = new Imagick();
$output->newImage($image->width(), $image->height(), $blendingColor, 'PNG');
// set transparency of original image
$output->compositeImage($image->core()->native(), Imagick::COMPOSITE_DSTIN, 0, 0);
$output->transparentPaintImage('#000000', 0, 0, false);
// copy original and create indexed color palette version
$output->compositeImage($image->core()->native(), Imagick::COMPOSITE_DEFAULT, 0, 0);
$output->quantizeImage(255, $output->getImageColorSpace(), 0, false, false);
// ensure to encode PNG image type 3 (indexed)
$output->setFormat('PNG8');
$output->setImageFormat('PNG8');
// ensure to encode PNG image type 6 (true color alpha)
$output = clone $image->core()->native();
$output->setFormat('PNG32');
$output->setImageFormat('PNG32');
return $output;
}