This has been discussed here several times before; I recall enjoying the discussions: https://news.ycombinator.com/item?id=8831172 https://news.ycombinator.com

This has been discussed here several times before; I recall enjoying the discussions: https://news.ycombinator.com/item?id=8831172 https://news.ycombinator.com/item?id=8831172 (January, 2015) https://news.ycombinator.com/item?id=6410821 https://news.ycombinator.com/item?id=6410821 (September, 2013) https://news.ycombinator.com/item?id=575122 https://news.ycombinator.com/item?id=575122 (May, 2009) also relevant is the response of Adobe's John Nack: https://news.ycombinator.com/item?id=593286 https://news.ycombinator.com/item?id=593286 / https://blogs.adobe.com/jnack/2009/05/some_thoughts_about_the_psd_format.html https://blogs.adobe.com/jnack/2009/05/some_thoughts_about_th... (the URL has moved since the HN discussion happened) (May, 2009)