CC sent over nine more sets of metadata, so I started working through them. I've done six so far. Just for the record, this is the procedure (using PhotoShop):

• Archive the original image in a backup folder.
• Open in PhotoShop, and convert to RGB mode. Save (and keep saving) to the main scans folder.
• Using the magic wand, select some background grey or speckle, then choose Select Similar, and delete. Play around with this step until you've got a relatively clean image, without losing detail.
• Clean up the edges of the image, along with any egregious surface marks in the picture.
• If there's a BN mark with a ruler, it can be moved in closer to the image sometimes, to keep the size down.
• Crop the image to remove excessive whitespace around the outside.
• Add CC's metadata to the header of the XML file, and then change all the size info to match the cropped image (there are three locations where dimensions appear).
• Resize the image using Bicubic Smoother to create one 800px wide. Save this image using Save For Web, with the wv_ prefix, into the scans folder.
• Undo the resize to get back to the original image, then set the Select Style to "Fixed Aspect Ratio", and select an interesting square. Copy to clipboard.
• Create a new image, and paste from the clipboard.
• Resize this image to 200 x 200, then Save For Web to the images folder with the thumb_ prefix.
• Copy the main image file from scans to xml/images
• Move the XML file from scans to xml/images
• Update the server directories so Helena can see the files.