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create 8-bit png instead of 16-bit

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This commit is contained in:
Uwe Steinmann 2023-03-11 18:59:02 +01:00
parent 2e818d5426
commit da992a7bdd
1 changed files with 8 additions and 3 deletions
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11
inc/inc.ClassConversionServicePdfToImage.php
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@ -65,9 +65,14 @@ class SeedDMS_ConversionServicePdfToImage extends SeedDMS_ConversionServiceBase
if(!empty($params['width'])) if(!empty($params['width']))
$imagick->scaleImage(min((int) $params['width'], $imagick->getImageWidth()), 0); $imagick->scaleImage(min((int) $params['width'], $imagick->getImageWidth()), 0);
/* Remove alpha channel and set to white */ /* Remove alpha channel and set to white */
$imagick->setImageBackgroundColor('white'); $imagick->setImageBackgroundColor('white');
$imagick->setImageAlphaChannel(Imagick::ALPHACHANNEL_REMOVE); /* Setting the color-type and bit-depth produces much smaller images
$imagick->mergeImageLayers(Imagick::LAYERMETHOD_FLATTEN); * because the default depth appears to be 16 bit
*/
$imagick->setOption('png:color-type', 6);
$imagick->setOption('png:bit-depth', 8);
$imagick->setImageAlphaChannel(Imagick::ALPHACHANNEL_REMOVE);
$imagick->mergeImageLayers(Imagick::LAYERMETHOD_FLATTEN);
$imagick->setImageFormat('png'); $imagick->setImageFormat('png');
$end = microtime(true); $end = microtime(true);
if($this->logger) { if($this->logger) {