Photoshop CS3 generates a Postscript file that contains codes that are not supported by RasterPlus.
There are a couple of ways that files can be printed from Photoshop CS3 through RasterPlus.
1. Use a RasterPlus Hot Folder
a. RasterPlus Hot Folder usage is define in the Network Printing chapter in the RasterPlus manual.
b. Save files from Photoshop CS3 as JPG files.
c. Add the Photoshop JPG file to the RasterPlus Hot Folder.
d. RasterPlus will automatically print any image file added to the defined Hot Folder. The image will be printed on the media size specified in RasterPlus.
2. There is a work around to this problem on the Adobe support page.