Photoshop Format You can send us your Photoshop files if you're not sure how to export them to TIFF format. Simply save your Photoshop file in Photoshop Format (.psd). You must: 1 . Make sure your files are in CMYK MODE, not RGB MODE 2 . Make sure your files are 300 dpi or higher 3 . Any "unusual" or "rare" fonts must be included when you upload your files. 4 . Compress your files using either winzip (on PCs), or stuff it (on MACs).