Hi all, Any ideas of this?
Fred, thanks for your suggestions regarding the changes to filters. I poured through the changelog and did not see anything that could account for this. I wrote a script to retry my thumbnailing with every possible "-filter Option" but I couldn't see a difference, or at least not the fix I was looking for. I also tried using "-thumbnail WxH -strip" to account for the changes in 2009-07-28 6.5.4-7 but that did not produce a noticeable change. Is everyone else continuing to see the same quality of thumbnailing that they had a year ago? (If so, would you email me your command lines for thumbnailing -- I know that topic has been hashed out a lot, but I really to look at anything.) Is there an archive of every Windows Q16 DLL release for the last year? It might be useful for me to try our thumbnail builds on everything between 6.4.9-2 and 6.5.7-0 to see exactly where things changed for us. I did my best to give the simplest, cleanest repro of the problem as documented below. If there is any additional information I can provide, please let me know. Thanks! -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of as01 Sent: Friday, October 16, 2009 11:13 AM To: [email protected] Subject: [magick-users] changes to thumbnail handling between IM 6.49 and IM 6.5.9? Hello all, Our company has used ImageMagick for many years to successfully generate thumbnails. Since Feb 4th of this year we have used ImageMagick-6.4.9-2-Q16-windows-dll.exe and that has worked fine. On Tuesday I upgraded to ImageMagick-6.5.6-10-Q16-windows-dll.exe and am now getting complaints (from multiple customers) that our thumbnails are fuzzy. Our actual thumbnail build process is complex & uses PerlMagick but I can demonstrate the issue using these simple commands: convert -size 420x420 -thumbnail 420x420 -quality 75 -colorspace RGB -sharpen 0.1x0.2 source.jpg th420_%im_version%.jpg convert -size 140x140 -thumbnail 140x140 -quality 75 -colorspace RGB -sharpen 0.1x0.2 th420_%im_version%.jpg th140_%im_version%.jpg The first creates a 420px thumbnail from the source, and the second creates a 140px thumbnail from the 420px one. Using ImageMagick 6.4.9-2-Q16 we get this: http://87.252.62.61/thumb/th140_64.jpg With ImageMagick 6.5.6-10-Q16 we get this: (fuzzier, specifically with the girl's freckles washed out) http://87.252.62.61/thumb/th140_65.jpg I have copied our build script and linked to the original source image and shown both thumbs side-by-side at http://87.252.62.61/thumb/side_by_side.html Is anyone able to help with this? I have searched the changes documentation between 6.4.9 and 6.5.6 and I do not see anything related to changes to thumbnailing or sharpening. I haven't seen anything on this list or in the forum related to it. Could it be something like I need to uppercase "-Sharpen" now or something??? I could revert to 6.4.9-2 but I hate to go back. Also I could find new sharpen arguments for 6.5.6, but the ones we had took weeks to decide upon and will affect millions of images from thousands of different photographers/cameras and so the best option would be to make what worked before work again. Thanks for any help! _______________________________________________ Magick-users mailing list [email protected] http://studio.imagemagick.org/mailman/listinfo/magick-users _______________________________________________ Magick-users mailing list [email protected] http://studio.imagemagick.org/mailman/listinfo/magick-users
