[IMAGING-186] Add sCAL support to PNG reading and writing

• Type: Improvement
• Status: Closed
• Priority: Minor
• Resolution: Fixed
• Fix Version/s: 1.0-alpha1
• Component/s: Format: PNG
• Labels: feature newbie
• Flags: Patch
• Assignee: Benedikt Ritter
• Reporter: Ric Emery
• Created: 09/Jul/16 00:48
• Updated: 03/May/19 08:39
• Resolved: 31/Jul/16 11:38

Description

It would be nice if the optional PNG - Physical Scale - sCAL chunk could be read and written.

http://www.libpng.org/pub/png/book/chapter11.html#png.ch11.div.9

For my use case, the pHYs chunk is not a good alternative. the pHYs x and y values are ints which lose necessary precision.

I have a patch (with junits) ready for your review if you are interested.

Thanks