We have a system which can detect photos which may not print well. When a photo is too small, of poor quality or has too low a resolution, a warning icon will appear on the photos, advising you not to use them.
A picture's resolution is crucial if you aim at a good result. We suggest not to use picture downloaded from social networks like SnapChat, WhatsApp or Facebook, as often their have a low resolution but rather to only print high resolution pictures, those taken directly with you mobile phone 🤳 or digital camera. 📸
If you ignore this warning, your photos may be blurry when printed, even though they seem to be good quality on the screen (especially if you want to order large products like posters).