https://hm2k.org/posts/how-to-convert-an-image-to-greyscale-using-php Research and development Wed, 30 Dec 2009 20:31:40 +0000 hourly 1 https://wordpress.org/?v=5.5.1 https://hm2k.org/posts/how-to-convert-an-image-to-greyscale-using-php/comment-page-1#comment-192682 Wed, 30 Dec 2009 20:31:40 +0000 http://www.hm2k.com/?p=583#comment-192682 What about transparent PNG? are they recommended?

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