If you are adding images to your letters, below are a few helpful tips to optimise the final print quality: 

DO’S: 

• Do use a high-resolution JPEG or PNG in your documents; image quality should be 300dpi for printed documents 

• Do use the original high-resolution image 
• Do try to use images that are naturally large in size, and reduce their size appropriately in the document 
• In the PDF settings, ensure that ‘Optimize for’ option is set to ‘Standard (publishing online and printing)’ 
• If using PDF Optimisation software to reduce the size of your final PDFs, ensure that ‘Downscale Images’ options are not checked 
• If using PDF Optimisation software to reduce the size of your final PDFs, ensure that any quality settings are set to the highest available option 

DON’TS: 

• Don’t use the ‘Compress Images’ function in order to reduce the file size of your documents 
• Don’t use images in your documents that have been captured via screenshot 
• Don’t use images in your documents that have been downloaded from a web page 
• Don’t use images that are naturally small and need to be enlarged in the document