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Here's a linux command line solution to remove all your phoca thumbnails so the system will generate them again:

cd /home/your_joomla_folder/images/phocagallery

find  -name "*phoca_thumb*" -print0|xargs -0 rm

And here's another Phoca gallery trick for global watermark files(i.e you will have global watermark files instead of having to copy watermark-large.png and watermark-medium.png into all gallery subfolders):

This modification will watermark all files in all categories and subcategories subfolders using global watermark files placed in [your joomla root]/images/phocagallery.

Watermark files should be named watermark-large.png and watermark-medium.png, and you should save them as RGB PNG images with transparency.

You have to edit phocagallery.php in administrator/components/phocagallery/helpers

add this line

$path=JPATH_ROOT.DS.'images'.DS.'phocagallery';

before

 // Which Watermark will be used 

,then a little bit below replace

$fileWatermark    = str_replace($fileName, 'watermark-medium.png', $file_in);

with

$fileWatermark    = $path.DS.'watermark-medium.png';

then

$fileWatermark    = str_replace($fileName, 'watermark-large.png', $file_in);

with

$fileWatermark    = $path.DS.'watermark-large.png';

the code should look like this now:

// TMJ MOD
// global watermark file instead of per-gallery folder
$path=JPATH_ROOT.DS.'images'.DS.'phocagallery';
// Which Watermark will be used
if ($thumbnailMedium) {
    // $fileWatermark    = str_replace($fileName, 'watermark-medium.png', $file_in);
    $fileWatermark    = $path.DS.'watermark-medium.png';
} else if ($thumbnailLarge) {
    // $fileWatermark    = str_replace($fileName, 'watermark-large.png', $file_in);
    $fileWatermark    = $path.DS.'watermark-large.png';





Additional fix for watermarks09-04-2009 00:04
an1j21

In addition to the above fix find 
 // Watermark 
 if ($fileWatermark != '') { 
 ImageCopy($image2,$waterImage1,$locationX,$locationY,0, 0,$wW,$hW); 
 } 
 // End Watermark 
 and replace it with  
 // Watermark 
 if ($fileWatermark != '') { 
 ImageCopymerge($image2,$waterImage1,$locationX,$locatio nY,0,0,$wW,$hW, 15); 
 } 
 // End Watermark 
 
where the extra 15 is the merge amount in % 
so 100 would be the same as ImageCopy() 
I found that 15% with white text & a thin black stroke around the letters works best.