ICC weirdness in PDF

[glennrp]

I'm not sure what is going on here. The warning comes from libpng16. Somehow
libpng is involved in reading or writing PDF files, and it's inserting an ICC profile
that libpng16 does not like.

Code: Select all

$ q16convert xc:green green.pdf
$ q16convert green.pdf null:-
q16convert: iCCP: profile 'default_rgb.icc': 0h: PCS illuminant is not D50 `/tmp/magick-19896dpRrXxuz36Gd1' @ warning/png.c/MagickPNGWarningHandler/1830.
$ q16convert -version
Version: ImageMagick 6.8.8-7 Q16 x86_64 2014-02-26 http://www.imagemagick.org

Also, the PDF is grayscale when the input is RGB:

Code: Select all

$ q16identify green.pdf
green.pdf PDF 1x1 1x1+0+0 16-bit Bilevel Gray 61B 0.000u 0:00.000

[magick]

We can reproduce the PNG problem, our PDF is runlength-encoded. Inspect the filter in green.pdf. Is it /RunLengthDecode?

We can reproduce the identify problem. Although the image does display as green, it returns Gray unless you add -verbose to the command-line. We'll investigate, but it may be a week or so. We have lots of work already in the pipe.

[glennrp]

We can reproduce the PNG problem, our PDF is runlength-encoded. Inspect the filter in green.pdf. Is it /RunLengthDecode?

Yes, "/Filter [ /RunLengthDecode ]" appears twice in green.pdf.