Last modified: 2012-10-26 13:25:32 UTC
The image thumbnail in [[hu:Világosi_Gábor]] has weird stripes on it (in IE, it doesn't appear at all). Purging does not help. The original image seems fine: http://upload.wikimedia.org/wikipedia/commons/3/38/Vil%C3%A1gosi_G%C3%A1bor.jpg Screenshots of the article in Firefox (looks 4.0) and IE8: http://hu.wikipedia.org/wiki/F%C3%A1jl:Screen_Vilagosi_Gabor_Kep_Megjelenes_Mozilla.gif http://hu.wikipedia.org/wiki/F%C3%A1jl:Screen_Vilagosi_Gabor_Kep_Megjelenes_IE8.gif
I can reproduce this locally on Ubuntu 11.04 -- the worst artifacting goes away if I remove the '-sharpen' (!?!) Striped output with options as per MW default: convert \ -quality 80 \ -define jpeg:size=200x289 \ Világosi_Gábor.jpg \ -thumbnail '200x289!' \ -depth 8 \ -sharpen 0x0.4 \ -auto-orient \ out-striped.jpg Non-striped output with the sharpen removed: convert \ -quality 80 \ -define jpeg:size=200x289 \ Világosi_Gábor.jpg \ -thumbnail '200x289!' \ -depth 8 \ -auto-orient \ out-ok.jpg $ convert --version Version: ImageMagick 6.6.2-6 2011-03-16 Q16 http://www.imagemagick.org Copyright: Copyright (C) 1999-2010 ImageMagick Studio LLC Features: OpenMP
I can work around this locally by opening and re-saving the full size image in Gimp. The original file has 4 color components and may be some sort of CMYK; that might be confusing things in ImageMagick which are optimized more for RGB and RGBA: $ djpeg -verbose -debug Világosi_Gábor.jpg Independent JPEG Group's DJPEG, version 8b 16-May-2010 Copyright (C) 2010, Thomas G. Lane, Guido Vollbeding Start of Image Miscellaneous marker 0xe1, length 6494 Miscellaneous marker 0xed, length 15496 Miscellaneous marker 0xe1, length 6463 Adobe APP14 marker: version 100, flags 0x4000 0x0000, transform 2 Define Quantization Table 0 precision 0 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 2 1 1 1 1 1 1 2 2 1 1 1 1 1 2 2 3 1 1 1 1 2 2 3 3 1 1 1 2 2 3 3 3 1 1 2 2 3 3 3 3 Define Quantization Table 1 precision 0 1 1 1 1 2 3 3 3 1 1 1 2 3 3 3 3 1 1 1 3 3 3 3 3 1 2 3 3 3 3 3 3 2 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 Start Of Frame 0xc0: width=531, height=768, components=4 Component 1: 1hx1v q=0 Component 2: 1hx1v q=1 Component 3: 1hx1v q=1 Component 4: 1hx1v q=0 Define Restart Interval 67 Define Huffman Table 0x00 0 0 6 2 3 1 0 0 0 0 0 0 0 0 0 0 Define Huffman Table 0x01 0 0 6 3 1 1 1 0 0 0 0 0 0 0 0 0 Define Huffman Table 0x10 0 2 1 3 4 1 3 3 2 3 3 3 2 6 9 117 Define Huffman Table 0x11 0 2 1 3 2 4 4 3 5 4 4 4 6 6 5 109 Start Of Scan: 4 components Component 1: dc=0 ac=0 Component 2: dc=1 ac=1 Component 3: dc=1 ac=1 Component 4: dc=0 ac=0 Ss=0, Se=63, Ah=0, Al=0 PPM output must be grayscale or RGB
Might be related to bug 24854. That is also about issues with CMYK
Fixed as well? I can't see the original problem as the screenshots were deleted and all seems fine now.
Jup, fixed as well.
