#221 Interlace Oddity

libpng_code
closed-fixed
None
5
2014-06-06
2014-04-05
Eric Huss
No

When reading an interlaced image with a bit depth less than 8, png_progressive_combine_row will use the "sparkle" technique for interlace passes 3 and 5. I would expect it to use the block method for every pass.

This change was introduced in the git revision 4e68aa7 where significant changes were made to png_combine_row.

I'm fairly confident that the attached patch will fix this issue, but I am not deeply familiar with the libpng source.

1 Attachments

Discussion

  • Glenn Randers-Pehrson

    Fixed in libpng-1.5.19beta03 and 1.6.11beta03 and (GIT only for now) libpng-1.7.0beta35. Thanks.

     
  • Glenn Randers-Pehrson

    • status: open --> open-accepted
     
  • Glenn Randers-Pehrson

    Fixed in libpng-1.6.11, thanks.

     
  • Glenn Randers-Pehrson

    • status: open-accepted --> closed-fixed
    • assigned_to: Glenn Randers-Pehrson
     

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No, thanks