[jmartinpetersen]

The code (and comment) is five years old. Any updates on how the PSD format has changed (if at all) since then?

Also, the title used here isn't actually a quote from the link. I'd opt for the closing sentence "PSD is not my favourite file format" instead ...

[kmike84]

In modern PSD files a lot of information is stored in "descriptors"; they are all parsed in an uniform way. Some of the information (like font data) is in undocumented "Raw Data" descriptors though.

The official PSD specs are now online: http://www.adobe.com/devnet-apps/photoshop/fileformatashtml/.

Specs don't provide information about all PSD features, but they are a good start. As I recall, an initial version of https://github.com/kmike/psd-tools took a weekend; I was following specs, using PIL (Pillow) for pixels handling; also, I was checking other PSD readers when something was unclear - there is a lot of open-source PSD readers. Earlier readers are from 2005 or maybe earlier, they have been available long before the code with this "famous" comment was written.

[detaro]

As far as I know PSD hasn't had a "reset", but only incremental features, and compatibility has been good, so I'd expect that not much has changed. Only user perspective though, I haven't looked at the format itself.

Since compatibility is quite important in this case, I don't really expect big changes though. Adobe has a working code base and documentation for it, so there likely is no incentive to risk change.

[toephu2]

it is a quote from the link, look at the 2nd line of the comment

[detaro]

The title got changed, the original title wasn't.