Search found 23 matches

by dimkalinux
2011-01-29T11:41:13-07:00
Forum: Users
Topic: Correct resize
Replies: 68
Views: 198712

Re: Correct resize

Distort with lanczos a little better than pure distort, but all both produse a not-sharpen images and than i need steel use Distort+USM. More with pure distort.
by dimkalinux
2011-01-29T11:11:47-07:00
Forum: Users
Topic: Correct resize
Replies: 68
Views: 198712

Re: Correct resize

Black borders instead a shadow in previos post is reason use '-alpha off' in cmd.
With -alpha on semi-transparent bordes looks perfect.

Now try deal with -distort animated gif

Yes, some thing - "-alpha on" all fixed.
by dimkalinux
2011-01-29T04:46:54-07:00
Forum: Users
Topic: Correct resize
Replies: 68
Views: 198712

Re: Correct resize

Seems to be distort bad working with shadows around images border on png. With this cmdline /usr/bin/convert '/var/upload/pic2/1/d0e857/pv_33e63afc.png' -depth 16 -colorspace sRGB -auto-orient -alpha on -virtual-pixel transparent +distort Affine "0,0 0,0 %w,0 70,0 0,%h 0,60" -alpha off -crop 70x60+0...
by dimkalinux
2011-01-28T13:55:34-07:00
Forum: Users
Topic: Correct resize
Replies: 68
Views: 198712

Re: Correct resize

I make a few tests - results here http://pic.lg.ua/test/resize_vs_distort/ 1) Distorts with Lanczos work bad on diagonal lines (much better in IM 6.6.7). 2) Resize+Mitchell visually close identical to Distort. 3) Unsharpen (USM) after resizing work good and make image much better. 4) Gamma aware res...
by dimkalinux
2011-01-28T10:03:43-07:00
Forum: Users
Topic: Correct resize
Replies: 68
Views: 198712

Re: Correct resize

I many times tested Lanczos filter - its good (not perfectly) sharpen, but on images like Fly (u can see it on my previous posts) it make strong halo or muar effect in fly eyes. On my opinion Mitchell + small USM (< 1) give better or equal result without or less halo/muar effect. And seems to be Lan...
by dimkalinux
2011-01-26T06:52:25-07:00
Forum: Users
Topic: Correct resize
Replies: 68
Views: 198712

Re: Correct resize

Q16 Resize vs Distorts resize time /usr/bin/convert ./28a42084.jpg -depth 16 -gamma 0.45454545 -filter Mitchell -auto-orient -resize 400x400 -gamma 2.2 -quality 95 -sampling-factor 1x1 -unsharp 0x0.77+0.77+0.008 -strip -background white jpeg:./t_gamma_r.jpg real 0m0.624s user 0m1.085s sys 0m0.031s ...
by dimkalinux
2011-01-26T01:08:13-07:00
Forum: Users
Topic: Correct resize
Replies: 68
Views: 198712

Re: Correct resize

time /usr/bin/convert ./28a42084.jpg -depth 16 -colorspace sRGB -filter Mitchell -auto-orient -resize 400x400 -colorspace RGB -quality 95 -sampling-factor 1x1 -unsharp 0x0.77+0.77+0.008 -strip -background white jpeg:./t_colorspace.jpg real 0m0.739s user 0m1.188s sys 0m0.074s http://pic.lg.ua/test/t...
by dimkalinux
2011-01-25T12:02:53-07:00
Forum: Users
Topic: Correct resize
Replies: 68
Views: 198712

Correct resize

Hi. Im use magick for pic resize on image hosting. i prefer hight quality and that why i use gamma aware resizing with this cmdline, for example convert -depth 16 -gamma 0.454545 -filter ... -resize 500x500 -gamma 2.2 -depth 8 All works find, but i know that method with gamma isnt 100% perfect. i re...