Warnings were seen in console while running Swift. Used ImageMagick to do identity reconversion: $ convert file.png file.png Following warnings were seen during reconversion on Fedora 20 with libpng-devel-1.6.3-3.fc20.x86_64 and ImageMagick-6.8.6.4-4.fc20.x86_64: convert: cHRM: invalid chromaticities `./Swift/resources/icons/certificate.png' convert: iCCP: known incorrect sRGB profile `./Slimber/Resources/Offline.png' @ warning/png.c/MagickPNGWarningHandler/1830. convert: iCCP: known incorrect sRGB profile `./Swift/resources/icons/certificate.png' @ warning/png.c/MagickPNGWarningHandler/1830. convert: cHRM: invalid chromaticities `./Swift/resources/icons/certificate.png' @ warning/png.c/MagickPNGWarningHandler/1830. convert: iCCP: known incorrect sRGB profile `./Swift/resources/themes/Default/Incoming/buddy_icon.png' @ warning/png.c/MagickPNGWarningHandler/1830. convert: iCCP: known incorrect sRGB profile `./Swift/resources/themes/Default/Outgoing/buddy_icon.png' @ warning/png.c/MagickPNGWarningHandler/1830. convert: iCCP: profile 'Photoshop ICC profile': 'RGB ': RGB color space not permitted on grayscale PNG `./Swift/resources/logo/logo-chat-100.png' @ warning/png.c/MagickPNGWarningHandler/1830. convert: iCCP: profile 'Photoshop ICC profile': 'RGB ': RGB color space not permitted on grayscale PNG `./Swift/resources/logo/logo-chat-16.png' @ warning/png.c/MagickPNGWarningHandler/1830. And following on Ubuntu 13.10 with libpng12-dev 1.2.49-4ubuntu1 and imagemagick 8:6.7.7.10-5ubuntu3: convert.im6: Ignoring attempt to set cHRM RGB triangle with zero area `./Swift/resources/icons/certificate.png' @ warning/png.c/MagickPNGWarningHandler/1754. Change-Id: Ic8689f220c1863ec9b3dfa7686633e707d253317 License: This patch is BSD-licensed, see Documentation/Licenses/BSD-simplified.txt for details.