When placing scanned or created RASTER files, please be certain that resulting megabyte file size conforms as closely as possible to the following large format printing formula belows: Note: file sizes stated below always refer to file size when the file is in RGB mode. If the file is in CYMK mode add 25% to the MBs. IMPORTANT: Do not take an existing low or medium resolution file and increase the file size in Photoshop. This will yield a highly pixilated image.
These resolutions are appropriate for most jobs requiring a high degree of sharpness, i.e. photos with fine type, sharp curves and critical image detail. Images that are soft and generic require lower resolution.