Seems to have isolated the issue to be file specific.
Only files that are ".tif" cannot be converted for the purpose of using the "Download by Size" function..

I doubt it's a general tiff vs jpeg problem, but rather that the plugin treats tiff special under some condition, see $permitted_non_picture in
https://github.com/plegall/Piwigo-downl … nc.php#L23
and following. Maybe the condition isn't as intended, though from a short glance it looks like a tiff is excluded from the early return.

Another possibility would be that for some reason $picture['current']['download_url'] is empty as if "the user has not access to the original" picture and
$conf['download_by_size_follow_enabled_high'] = true;
is set in the config.

Apparently the code that can be downloaded as [extension by plg] Download by Size is not the same as the GitHub one linked to on that extension page and does not include the latest commit (now one year old) that exactly made this change:
[Github] Piwigo-download_by_size commit 70b8aa46

You can try to apply the patch (of course you backup the plugin first :p) in your installation, i.e.

cd plugins/download_by_size
curl https://github.com/plegall/Piwigo-download_by_size/commit/70b8aa4655561da9a336ca77ef949452917d18d4.patch | patch -p1

$conf['download_by_size_follow_enabled_high'] is unrelated to the patch, it has been there before and when set to true forbids to download any size if the user is not allowed to download the original size.

When a .tif file is uploaded to the site / is allready there - how do i trigger download_by_size to convert it into multiple files for download?

I can do a batch manager where i can generate multiple sizes, but doesn't seems to work that way..

Hello,

My problem is currently, that after making all this changes - and checking the exclusion list, it still cannot generate any other formats from the .tif files.

This is still the problem i am having. :-)

Code from main.inc.php

function dlsize_picture()
{
  global $conf, $template, $picture;

  // some non picture files (with a representative) are relevant for multiple
  // size download, so let's make exceptions
  $permitted_non_picture = array('tiff');

and from the config.inc.php file

<?php
$conf['tiff_representative_ext'] = 'png';
$conf['graphics_library'] = 'ext_imagick';

$conf['raw_jpg_quality'] = '60';
$conf['tiff_jpg_quality'] = '60';
$conf['browser_language'] = false;
$conf['guest_access'] = false;
$conf['random_index_redirect'] = array(
    PHPWG_ROOT_PATH.'index.php?/categories/20' => 'return true;'
    );
$conf['enable_i_log'] = true;
?>

Maybe its the ext_imagick that is not working as it should?

Hello,

I have made the code the original again.

I can see that .png, .jpg etc are making different sizes to download and having them in the pwg_representative

But currently im trying to make it do the same for .tif files - but cannot see how i can make that work, and troubleshooting this is not exactly easy.. :)