Image format conversion in thumb()

flokosiol · November 11, 2016, 7:57am

You can override the default ImageMagick and/or GD driver as described here. Then you can add custom stuff as you like.

I’m doing this with my Focus plugin, too:

flokosiol/kirby-focus/blob/master/drivers/gd.php#L11


<?php


/**
* Overriding default GDLib Driver
*/
thumb::$drivers['gd'] = function($thumb) {
 try {
   $img = new abeautifulsite\SimpleImage($thumb->root());
   $img->quality = $thumb->options['quality'];


   if (isset($thumb->options['focus']) && isset($thumb->options['fit']) && isset($thumb->options['ratio']) && isset($thumb->options['focusX']) && isset($thumb->options['focusY'])) {
     
     // calculate crop coordinates and width/height for the original image
     $focusCropValues = focus::cropValues($thumb);


     // crop original image with thumb ratio and resize it to thumb dimensions
     $img->crop($focusCropValues['x1'], $focusCropValues['y1'], $focusCropValues['x2'], $focusCropValues['y2'])->thumbnail($thumb->options['width'], $thumb->options['height']);
   }
   else if ($thumb->options['crop']) {
     @$img->thumbnail($thumb->options['width'], $thumb->options['height']);
   }

github.com

flokosiol/kirby-focus/blob/master/drivers/im.php#L25


}


if ($thumb->source->extension() === 'gif') {
  $command[] = '-coalesce';
}


if ($thumb->options['grayscale']) {
  $command[] = '-colorspace gray';
}


if (isset($thumb->options['focus']) && isset($thumb->options['fit']) && isset($thumb->options['ratio']) && isset($thumb->options['focusX']) && isset($thumb->options['focusY'])) {


  // calculate crop coordinates and width/height for the original image
  $focusCropValues = focus::cropValues($thumb);


  // crop original image with thumb ratio and resize it to thumb dimensions
  $command[] = '-crop ' . $focusCropValues['width'] . 'x' . $focusCropValues['height'] . '+' . $focusCropValues['x1'] . '+' . $focusCropValues['y1'];
  $command[] = '-resize "' . $thumb->options['width'] . 'x' . $thumb->options['height'] . '^"';
}
else if ($thumb->options['crop']) {
  if (empty($thumb->options['height'])) {

You still need to figure out how to convert the images. I found these to links, but didn’t check if it works:

http://www.imagemagick.org/discourse-server/viewtopic.php?t=24048#p103330

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Image format conversion in thumb()

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