[support] Image derivatives - help needed with cleanup

[Chris McGinlay]

Hi,

Im running Drupal 5.2 on www.rockstanza.info, with image-5.x-1.4, 
img_assist-5.x-1.4 (reckon this should be 5.x-1.4-dev etc)

However my problem is not with img_assist, rather just with image itself.

My images directory keeps getting larger with many duplicate copies appearing 
in the directory with no referring entry in the files table. Here is one 
example:

directory listing, suppressed user:group (=apache:apache) for brevity:

ls -algG dscn0044*

-rw-rwxr--  1 129892 Jan 28  2007 dscn0044._original.jpg
-rw-r--r--  1  71910 Aug  9 13:18 dscn0044._original.medium.jpg
-rw-rw-r--  1 129892 Jul 20 04:23 dscn0044._original.preview_0.jpg
-rw-r--r--  1  71910 Jul 20 04:23 dscn0044._original.preview_0.medium.jpg
-rw-rw-r--  1 129892 Jul 20 05:07 dscn0044._original.preview_1.jpg
-rw-r--r--  1  71910 Jul 20 05:07 dscn0044._original.preview_1.medium.jpg
-rw-rw-r--  1 129892 Jul 20 07:07 dscn0044._original.preview_2.jpg
-rw-r--r--  1  71910 Jul 20 07:07 dscn0044._original.preview_2.medium.jpg
-rw-rw-r--  1 129892 Jul 20 12:37 dscn0044._original.preview_3.jpg
-rw-r--r--  1  71910 Jul 20 12:37 dscn0044._original.preview_3.medium.jpg
-rw-rw-r--  1 129892 Jul 20 15:05 dscn0044._original.preview_4.jpg
-rw-r--r--  1  71910 Jul 20 15:05 dscn0044._original.preview_4.medium.jpg
-rw-rw-r--  1 129892 Jul 19 18:30 dscn0044._original.preview.jpg
-rw-r--r--  1  71910 Jul 19 18:30 dscn0044._original.preview.medium.jpg
-rw-r--r--  1  10165 Aug  9 13:18 dscn0044._original.thumbnail.jpg

The database itself has just three entries:
413  	136  	_original  	images/dscn0044._original.jpg  	image/jpeg  	129892
7539 	136 	thumbnail 	files/images/dscn0044._original.thumbnail.jpg 	
image/jpeg 	10165
7540 	136 	medium 	files/images/dscn0044._original.medium.jpg 	image/jpeg 	
71910

i.e. no 'preview' size.

My image module settings define:
Preview 640x640
Medium 300x300

Anyone any ideas how to clean up the mess of uneeded images???

Ta!

Chris