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prevent artefacts in white areas #195

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prevent artefacts in white areas #195

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5 changes: 4 additions & 1 deletion adaptive-images.php
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Original file line number Diff line number Diff line change
Expand Up @@ -171,7 +171,10 @@ function generateImage($source_file, $cache_file, $resolution) {
imagefilledrectangle($dst, 0, 0, $new_width, $new_height, $transparent);
}

// invert the image to prevent atrifacts on white areas
imagefilter($src, IMG_FILTER_NEGATE);
ImageCopyResampled($dst, $src, 0, 0, 0, 0, $new_width, $new_height, $width, $height); // do the resize in memory
imagefilter($dst, IMG_FILTER_NEGATE);
ImageDestroy($src);

// sharpen the image?
Expand Down Expand Up @@ -319,4 +322,4 @@ function generateImage($source_file, $cache_file, $resolution) {

/* It exists as a source file, and it doesn't exist cached - lets make one: */
$file = generateImage($source_file, $cache_file, $resolution);
sendImage($file, $browser_cache);
sendImage($file, $browser_cache);