Thank you, Anthony and Wolfgang. I solved the issue. Wolfgang Hugemann wrote: > There is a really nice visualisation of the single steps in JPEG Com > pression (deplorably only in German, but you'll get through it, I guess) > at http://www.spemaus.de/studium/visjpeg/applet.html
wow! amazing! i have not gone through all of it but it is of excellent educational value (and it gave me a chance to refresh my Deutsch). Anthony Thyssen wrote: > | specifically I would like the edges of an image to not be compressed > | at all. > | > I dodn't even know that was posible with the JPEG format! > I doubt IM convert (which calls the libjpeg library) will do that. the solution: * produce two versions of the same image with ImageMagick, one at quality 100 and the other at quality 60 * use jpegtran to crop the q60, shaving off 8 pixels on each side * use jpegtran to merge the q60 on top of the q100 * use jpegtran to merge to a stripe results and details at <http://www.photopla.net/wwp0703/stripes.php> Greetings from Quebec Yuv _______________________________________________ Magick-users mailing list [email protected] http://studio.imagemagick.org/mailman/listinfo/magick-users
