Report-an-Apple-Bug Friday! 58

2007-05-12 00:02:18 -08:00

Slightly late because I had to devise a way to determine whether a GIF file is interlaced. (I settled on GifBuilder, in case you’re curious.) This ties in with the next two bugs; I’ll blog both at once next week.

This bug is NSImageInterlaced documented as working on half of known interlaceable types. It was filed on 2007-05-12 at 00:27 PDT.


The NSImageInterlaced property is documented as only working on PNG files, despite GIF also supporting interlacing.

Steps to Reproduce:

  1. Read the documentation of NSImageInterlaced.

Expected Results:

It describes NSImageInterlaced as applying to both PNG and GIF.

Actual Results:

It describes NSImageInterlaced as only applying to PNG.


None known.


It is possible to do interlacing in TIFF. The downsides are greater file size and the possibility that some readers may not understand the file.

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