| Online Digital Print Specifications
What File Resolution do I use best to have high quality output?
The ideal input file resolution is a mix of maximum output resolution, file size and image detail. Depending on your Internet connection speed, you can allow yourself to use larger files. On the other hand, exceeding the maximum output resolution of our labs is not useful either, as it would not result in higher print quality.
A. File formats:
1. TIFF file format:
The minimum file colour should be 16 bit (high) or 24 bit (true color).
8 bit (256 colors) images are not supported.
2. JPEG file format:
To reduce file size (and increase upload speed), you can save your images with JPEG compression.
You have to keep in mind that a too high compression can result in a serious loss in image detail.
Using the Microsoft Photo Editor, JPEG images should not be saved at a quality level of 50 or less. A too high (50 ->0) compression will result in a serious loss of output quality.
Using Adobe PhotoShop,Experience learned that an image quality after compression ratio of 8 or above (in Adobe PhotoShop) will not lead to visible loss in quality or detail.
To convert from uncompressed files (such as TIFF, or PhotoShop PSD) to compressed files, save the original uncompressed file as JPEG.
As example, you'll find a table below with compression data of TIFF to JPEG, using various JPEG compression ratio's in Adobe PhotoShop. | 
