Piwigo.org

LeoBian · 2015-08-11 13:20:09

Hi,

I'm using NAS (Synology DSM213j) as Piwigo server. Because of its poor CPU, I want to make the thumbnails locally by my MacBook and then uploads them to the server. The following is my steps:

1. Install Piwigo 2.7.4 on both Server and MacBook;
2. By using FTP methods, I create some Albums (on both sides);
3. On MacBook, generating thumbnails using Piwigo;
4. Uploads the thumbnails to server (i.e. $piwigo/_data/i/);

Here comes the question: While visiting the website on server, I found that the thumbnails have been regenerated rather than using the existing files!

There has two evidence that could prove what I said:

1. I generate the thumbnails and uploads them to the server before Aug. 5th 06:00, but I found the thumbnail's created time has become the time when I visit the photo (e.g. Aug 9th 15:32);
2. The most important, when I visit Albums, there's no thumbnails. But at the same time the server CPU utilization rate reaches 100% by several `CONVERT` processes, then the thumbnails appears.

Finally, can anyone tell me how to solve this problems?

Piwigo version: 2.7.4
PHP version: 5.2.17 (cli) (built: Feb 23 2012 10:42:34)
MySQL version: Ver 14.7 Distrib 4.1.22, for none-linux-gnueabi (arm) using readline 6.1
Piwigo URL: http://www.LeoBian.com/piwigo
Note: If you need, I could provide more details.

Thanks for your time.

Last edited by LeoBian (2015-08-12 02:51:22)

flop25 · 2015-08-11 20:55:51

Hello
i see some possibilities :
-the creation date of thumbnails is not more recent than the original pictures
-creation date can't be read
-one pixel smaller/bigger than yours

LeoBian · 2015-08-12 03:48:18

flop25 wrote:
Hello
i see some possibilities :
-the creation date of thumbnails is not more recent than the original pictures
-creation date can't be read
-one pixel smaller/bigger than yours

Dear flop25, thank you for your reply!

I followed your advice and check the associated files, here's a typical result:

Code:

Original photo file: (in $PIWIGO/galleries/albums-A)
-rwxrwxrwx    1 http     http      483.0K Jul 12 01:41 A01.jpg

Thumbnails uploaded by local MacBook: (in $PIWIGO/_data/i/galleries/albums-A)
-rw-r--r--    1 http     http       58.9K Aug  4 21:22 A01-xs.jpg
-rw-r--r--    1 http     http       94.8K Aug  4 21:22 A01-sm.jpg
-rw-r--r--    1 http     http      237.8K Aug  4 21:22 A01-la.jpg
-rw-r--r--    1 http     http      323.5K Aug  4 21:22 A01-xl.jpg

Thumbnails Regenerated by the server: (in $PIWIGO/_data/i/galleries/albums-A)
-rw-r--r--    1 http     http       74.0K Aug 12 08:49 A01-xs.jpg
-rw-r--r--    1 http     http      119.6K Aug 12 08:49 A01-sm.jpg
-rw-r--r--    1 http     http      309.4K Aug 12 08:49 A01-la.jpg
-rw-r--r--    1 http     http      420.6K Aug 12 08:49 A01-xl.jpg

The date and permission both appear to be correct, BUT the thumbnail's file size has changed!

I have no idea what happened. Does it mean that thumbnails is machine-dependent and can not be used interchangeably?

Thanks for you help.

flop25 · 2015-08-12 14:48:00

no piwigo just check the dimensions and the time ; the filesize depends on the jpeg quality etc
so what are the dimensions in pixels?

LeoBian · 2015-08-13 18:28:27

Thank you, and I'm sorry for my late reply.
Attached to this post is the related files (Thumbnails A01-xs.jpg by MacBook and Server).

- Dimensions in pixels of the thumbnails (A01-xs.jpg) are both 432x324.
- The original file (A01.jpg) dimensions is 1600x1200.

This two thumbnails look the same except for their file size.
Have you any suggestions about that?

Last edited by LeoBian (2015-08-13 18:38:04)

flop25 · 2015-08-13 19:51:07

the filesize doesn't matter at all
as i said Piwigo just check time and dimensions
so you say, the time is after the modification time of original picture and the dimensions are the same ; i'm wondering if the pictrues are generated again and again each time you visit them or if once the piwigo overwritten yours it stops

LeoBian · 2015-08-18 04:36:25

Thank you flop25, and with your help, I found the reason and solved this problem.

1) On server side, Piwigo -> plugins -> LocalFiles Editor, I add the following code (according Piwigo wiki):

Code:

// Library used for image resizing. Value could be 'auto', 'imagick',
// 'ext_imagick' or 'gd'. If value is 'auto', library will be choosen in this
// order. If choosen library is not available, another one will be picked up.
$conf['graphics_library'] = 'ext_imagick';
// If library used is external installation of ImageMagick ('ext_imagick'),
// you can define imagemagick directory.
$conf['ext_imagick_dir'] = '/opt/bin/';//change with own path!

2) Whereas at the very beginning, on MacBook side, I add nothing. (<- This is the reason!)
After adding the similar code, everything works fine now.

In brief, thumbnails should be generated by the same image processing program/method.

flop25, once again, I appreciate your help.

Piwigo.org

Announcement

#1 2015-08-11 13:20:09

[resolved] Thumbnails have been regenerated rather than using the existing files

#2 2015-08-11 20:55:51

Re: [resolved] Thumbnails have been regenerated rather than using the existing files

#3 2015-08-12 03:48:18

Re: [resolved] Thumbnails have been regenerated rather than using the existing files

flop25 wrote:

Code:

#4 2015-08-12 14:48:00

Re: [resolved] Thumbnails have been regenerated rather than using the existing files

#5 2015-08-13 18:28:27

Re: [resolved] Thumbnails have been regenerated rather than using the existing files

#6 2015-08-13 19:51:07

Re: [resolved] Thumbnails have been regenerated rather than using the existing files

#7 2015-08-18 04:36:25

Re: [resolved] Thumbnails have been regenerated rather than using the existing files

Code:

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