Thanks for the exiftool pointer - very nice utility. There is indeed about 2KB of extra Header info in the Apple JPEG - mostly ICC profile info. There is also some subsampling differences as the Apple default is using 4:2:0 and Adobe is using 4:4:4 which may play a factor in quality.
2KB? I see about 3K of color management info. If your images are sRGB or can be converted to sRGB you can likely get away with stripping that away. Especially since most browsers aren't color managed according to this page:
http://www.gballard.net/psd/go_live_page_profile/embeddedJPEGprofiles.html One way to get rid of the info: NSTask *jhead = [[NSTask alloc] init]; [jhead setStandardOutput: [NSFileHandle fileHandleWithNullDevice]]; [jhead setStandardError: [NSFileHandle fileHandleWithNullDevice]]; [jhead setLaunchPath: @"/path/to/jhead"]; [jhead setArguments:[NSArray arrayWithObjects: @"-se", @"-purejpg", pathToYourImage, nil]]; [jhead launch]; etc. Here's an example of image sizes before and after stripping of a 181x120 thumbnail: original: 13821 Jun 30 11:35 t-20090620-1110-5341.jpg stripped: 9647 Jun 30 11:35 t-20090620-1110-5341.jpg /\/\arc _______________________________________________ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
