Can I set a default 'normal' image width

[superjacent]

Hope someone can help.   I'm new to this.

I uploaded to my server a number of images that were 640 x 480.   I also created thumbnails prefixing the filename with "thumb_".

After the "Batch Update" procedure my 640 x 480 sized images were scaled down and in order to view the 640 x 480 images I have to click again on the normal image.   So in effect, three copies (thumb_, normal_ and original)

What I find confusing is that when I uploaded 1600 x 1200 images they were scaled down to 640 x 480 (normal).   

I can not find a setting for the "normal_" images, is there one?   I want the "normal_" image to always be 640 x 480 (or thereabouts).

Hope this makes sense.

[Stramm]

http://coppermine-gallery.net/demo/cpg14x/docs/index.htm#admin_picture_thumbnail_intermediate_dimension

[superjacent]

Thanks Stramm.   Checking that out now.