weird png file

[squ]

convert makes this image dark, is this a 'convert' problem or something wrong is with the image ?

for example, after

Code: Select all

convert file.png -resize 100% out.png

resulting image is:

[snibgo]

It doesn't go darker for me, IM 6.7.9 or 6.8.3, on Windows 7. If you have an older version, try an upgrade.

[fmw42]

What version of IM are you using? It may be that you were in the transition time when IM was changing to conform to sRGB and linear RGB and grayscale standards. See viewtopic.php?f=4&t=21269

It started about IM 6.7.6.7 and probably was not fully complete until 6.7.8.3.

[glennrp]

If you build IM with libpng-1.6.0, which identifies and checks sRGB ICC profiles, you get this warning with your input file:
identify: iCCP: known incorrect sRGB profile `remtext-arr_zps047ada59.png' @ warning/png.c/MagickPNGWarningHandler/1787.

[squ]

Code: Select all

$ convert -version

Version: ImageMagick 6.8.0-7 2013-03-01 Q16 http://www.imagemagick.org
Copyright: Copyright (C) 1999-2012 ImageMagick Studio LLC
Features: OpenCL

[fmw42]

Your conversion works fine for me using IM 6.8.3.7 Q16 Mac OSX Snow Leopard using libpng 1.4.11