Search found 23 matches

by dimkalinux
2013-09-30T13:03:23-07:00
Forum: Bugs
Topic: Strange artifacts after convert
Replies: 1
Views: 2900

Re: Strange artifacts after convert

Problem is solved — im forget added -clamp options for hdri version of convert.
With -clamp everything is fine.
by dimkalinux
2013-09-30T12:43:12-07:00
Forum: Bugs
Topic: Strange artifacts after convert
Replies: 1
Views: 2900

Strange artifacts after convert

Hi all. Im use imagemagick for resize images. This is original images http://pic.lg.ua/x/11/e864bd/677d8d3e.jpg This is my command line for resize. convert -depth 16 cec8fwqv4b8qxee3y5.jpg -colorspace RGB -filter Mitchell -sampling-factor 1x1 -thumbnail 139x231\! -background "#ffffff" -alpha Backgro...
by dimkalinux
2011-02-05T00:27:14-07:00
Forum: Users
Topic: Correct resize
Replies: 68
Views: 193094

Re: Correct resize

dimkalinux: The differences are very noticeable in your two screenshots (look, for example, at the corners, and the number 2 at bottom left). I'm having trouble, however, telling what the contribution of the filter is compared to USM's. Could you post the code? Resize /usr/local/bin/convert.hdri '/...
by dimkalinux
2011-02-04T12:08:34-07:00
Forum: Users
Topic: Correct resize
Replies: 68
Views: 193094

Re: Correct resize

If I get the drift of 2), I'd try "distort results sharpen up more naturally." Does this description sound accurate to you? Default distort produce some blurred images as and resize or as any other resize algo. But, with distort i can more accurately tune USM parameters and it produce less-artifact...
by dimkalinux
2011-02-04T00:33:54-07:00
Forum: Users
Topic: Correct resize
Replies: 68
Views: 193094

Re: Correct resize

I'm use -background #ffffff in all resize and i think it make all transparent pixels are white. is not? I'm read than images resized in IM with transparent preserve may cause that on Internet Explorer (maybe old version?) will display this transparent pixels as black. Cant testing because haven't IE...
by dimkalinux
2011-02-01T12:51:54-07:00
Forum: Users
Topic: Hi server load
Replies: 24
Views: 39696

Re: Hi server load

Not only pure cpu load may cause high Load Average - it may be high IO-wait (slow or bad tuned harddrive) or bad tuned webserver... too many reasons and no way to check it without ssh access to server. If u use Cpanel - its have not optimal performance of apache webserver, cpanel oriented on securit...
by dimkalinux
2011-02-01T12:22:44-07:00
Forum: Users
Topic: Correct resize
Replies: 68
Views: 193094

Re: Correct resize

99% photohosting services even dont use gamma aware scaling - and user happy. But differences very huge - if u can compare images. Im not shure that separately apha-channel processing produce huge differences. Maybe it complicated for practical realization in software, or slow. Im make little photoh...
by dimkalinux
2011-02-01T06:30:30-07:00
Forum: Users
Topic: Correct resize
Replies: 68
Views: 193094

Re: Correct resize

u need well tune USM mask for different image size. I think it is not image size that you should be testing, but the scaling factor of the resize. Not shure - USM applied after resize for already scaled images. Why i need make differences for original size? For example: 1 case: scale 502x502 image ...
by dimkalinux
2011-02-01T06:18:19-07:00
Forum: Users
Topic: Correct resize
Replies: 68
Views: 193094

Re: Correct resize

Can you give a demonstration of the effect you are trying to avoid, and the command you use? uch a demonstration would probably be more important as an example than the more normal, how to do it. Example better view on white background. Original http://pic.lluga.net/x/1/248770/347e2821.png Left bor...
by dimkalinux
2011-02-01T00:48:10-07:00
Forum: Users
Topic: Correct resize
Replies: 68
Views: 193094

Re: Correct resize

HDRI pixels can go negative or exceed the pixel range, generally 0-65535. You probably need to add -clamp in your workflow to restrict the pixel values to 0-65535. I think that in case when i save in non-float-able format like png/jpg truncate pixels range aka clamp make automatically. Ok, i try re...
by dimkalinux
2011-01-31T13:08:28-07:00
Forum: Users
Topic: Correct resize
Replies: 68
Views: 193094

Re: Correct resize

Make test with HDRI version - it produce many tiny color errors in result.
Its normal for HDRI or report bug?

HDRI - http://pic.lluga.net/s/sifaS
Normal Q16 - http://pic.lluga.net/s/aXHFH
by dimkalinux
2011-01-31T10:57:37-07:00
Forum: Users
Topic: How to speed up resample action!!
Replies: 5
Views: 11654

Re: How to speed up resample action!!

In latest version of IM PNG seems to be slow - u can try early version.
by dimkalinux
2011-01-30T03:56:32-07:00
Forum: Users
Topic: Correct resize
Replies: 68
Views: 193094

Re: Correct resize

Another "funny" things with distort+USM. If your image have 1px contrast borders - after USM it can dissapear. For avoid this u need well tune USM mask for different image size. Like this // MIN SHARPING $sharpen_cmd_part = ' -unsharp 0x0.5+0.4+0.005 '; // if ($dst_size > ((250 * 250) + 1)) { $sharp...
by dimkalinux
2011-01-30T01:45:01-07:00
Forum: Users
Topic: Correct resize
Replies: 68
Views: 193094

Re: Correct resize

I test this.

-filter blur is worse for diagonal lines - when overall sharpnes is the same as USM 0.75 - on blur diagonal lines is very bad. Specialy when lines is contrast solid thin line.
by dimkalinux
2011-01-29T14:21:41-07:00
Forum: Users
Topic: Correct resize
Replies: 68
Views: 193094

Re: Correct resize

After testing on different types of images: photo, screen-shots with text and others - i`m found that this parameters work best for me /usr/bin/convert ./322ca0b1.png -depth 16 -colorspace sRGB -auto-orient -alpha on -virtual-pixel transparent +distort Affine '0,0 0,0 %w,0 740,0 0,%h 0,650' -crop 74...