Mikolaj Machowski on wrote... | Anthony Thyssen scripsit: | > Mikolaj Machowski on wrote... | >| Hello, | >| | >| Anthony on his incomparable pages writes very much about increasing size | >| of image and how to get the best results but relatively little about | >| decreasing size. | >| | >| What is the best way(s) to achieve that? | >| | > Actually I write about both on the resize page. | | But concentrating more on time of operation, not quality (apart from | very specific examples like lines). | Time!! I don't concentrate on time. But on quality!!!!!
Of course I do talk about time more in the individual commands, but after that everything is on quality!!!! | > However for heavy resizing smaller, there is a seperate page. | > IM Examples, thumbnails | > http://imagemagick.org/Usage/thumbnails/ | | Not really relevant to my case :( | | My images aren't thumbnails per se (eg. I want to preserve whole | metadata), also because original format is tiff -size doesn't apply. | All additional eye-candy also is irrelevant - although maybe for use for | preparing CD/DVD covers. | Fair enough. | >| To get decent results when doing transition from 4000x4000 tiff to | >| 1000x1000 jpg I am doing something like that: | >| | >| convert pic.tiff -depth 8 -density 72 -resize 1000x1000 -filter lanczos | >| -unsharp 1x1+0.6 -sampling-factor 1x1 -quality 90 pic.jpg | >| | >| If I want better result I can make it in two or three steps and | >| manipulation unsharp mask. Any ideas how to do it better? | >| | > The -depth would do nothing in the above command. | | Not in my case. When working with Q16 it shaves off 10-15% of | execution time per image. | Strange. I don't see how. That setting only effects image output, and a few raw image input formats. Should bave very little effect on operators as images are still in memory using 16 bit values. Basically I am suprised by this statement. prehaps Chrisy can shead some light on this subject. | > while -density only sets the image density for the output image, | > so probably should be given at the end with -sampling-factor. | | Thanks. | | > The -filter setting however must be specified BEFORE the -resize | > command!!! It is also the default for image shrinking when no | > transparency is involved, so it is not even needed!!! | | I prefer explicit :) Thanks for placing tip. | No problem. The 'Basics' page explains how things are processed. Though it can be hard for begineers to know what are 'settings' and what are 'operators'. I try throught IM examples to define that status every time I mention some option. That is by using the word 'operator' or 'setting' instead of just 'option'. Anthony Thyssen ( System Programmer ) <[EMAIL PROTECTED]> ----------------------------------------------------------------------------- Always secure your files, you never know who is lurking about. -- Rick Cook, "The Wizardry Compiled" ----------------------------------------------------------------------------- Anthony's Home is his Castle http://www.cit.gu.edu.au/~anthony/ _______________________________________________ Magick-users mailing list [email protected] http://studio.imagemagick.org/mailman/listinfo/magick-users
