Legacy ImageMagick Discussions Archive

This works:

convert rose: -resize '34040x256!' out.png

But this produces an image that is solid blue:

convert rose: -resize '34041x256!' out.png

I'm doing this because I have a 1-bit 127296x256 PBM image that I need to convert to PNG. ImageMagick can't convert it, but "pnmtopng" can (which proves that the PNG format is capable of representing images of that size).

Version: ImageMagick 7.0.7-31 Q16 x86_64 2018-05-08 https://www.imagemagick.org
Features: Cipher DPC HDRI
Delegates (built-in): bzlib djvu fftw fontconfig freetype gslib gvc jbig jng jp2 jpeg lcms lzma openexr pangocairo png ps raw tiff webp xml zlib

Results from v6.9.5-3 and 6.9.9-40 and 7.0.7-28 on Windows 8.1 are fine:

Code: Select all

f:\web\im>%IM%convert rose: -resize "34041x256!" x.png
f:\web\im>%IMDEV%convert rose: -resize "34041x256!" x.png
f:\web\im>%IMG7%magick rose: -resize "34041x256!" x.png

We're getting expected results with ImageMagick 7.0.8-0 and libpng 1.6.34 with Linux. The out.png image is a skewed rose as expected and we could also create a 127296x256 1-bit PNG.

Ugh, sorry. False alarm. Not an ImageMagick bug.

It turns out that what's actually happening is that the "Preview" app on MacOS can't display it. Photoshop displays it fine.

Legacy ImageMagick Discussions Archive

Cannot write extremely wide PNG files

Cannot write extremely wide PNG files

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Re: Cannot write extremely wide PNG files

Re: Cannot write extremely wide PNG files