Tips for working in Photoshop
TIP 1: Creating your new document in Photoshop
Give your document a unique name, set the sheet size, resolution of 300dpi and select CMYK colour mode.
TIP 2: Check the size of your artwork
All artwork added to your print sheet must be high resolution, we recommend 300-600dpi. Remember we can only print as high quality as your original artwork.
To check your image size in Photoshop, see below;
TIP 3: Create your layout and save
Once your artwork is the correct size you can duplicate the layer into your new document.
Flatten your artwork; in the Menu go 'Layer' and 'Flatten Image'
Then save your artwork as a high quality, 300-600dpi (level 10-12) jpeg file.