LIBPNG: PNG reference library / Bugs / #221 Interlace Oddity

#221 Interlace Oddity

Milestone: libpng_code

Status: closed-fixed

Owner: Glenn Randers-Pehrson

Labels: None

Priority: 5

Updated: 2014-06-06

Created: 2014-04-05

Creator: Eric Huss

Private: 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

pngrutil.patch

Discussion

Glenn Randers-Pehrson - 2014-04-06

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

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Glenn Randers-Pehrson - 2014-04-06

status: open --> open-accepted
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Glenn Randers-Pehrson - 2014-06-06

Fixed in libpng-1.6.11, thanks.

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Glenn Randers-Pehrson - 2014-06-06

status: open-accepted --> closed-fixed

assigned_to: Glenn Randers-Pehrson
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#221 Interlace Oddity

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