The minimum resolution - or technical quality - of your photo depends on the dimensions of your final IXXI. The larger your IXXI, the higher the resolution (pixel density) should be.
We'll explain how it works: Depending on the chosen card size, use the following guidelines: For 10 x 10 cm cards, a photo should be between 250 and 500 pixels. For 20 x 20 cm cards, a photo should be between 500 and 1,000 pixels.
If you are creating a collage with one photo per card, follow the above guidelines for each photo. If you want to enlarge one photo across multiple cards, you need to do a little calculation. For example, if your enlargement is 100 cm wide, your photo should be between 2,500 and 5,000 pixels. (5 cards of 20 x 20 cm > 5 x 500-1000 = 2,500 - 5,000).
RGB and CMYK are both possible. RGB colors are converted to CMYK in the printing process. Note: due to this process and your screen settings, colors on your screen may slightly differ from the final print.
Allowed file formats
jpg, jpeg, and png.
Resolution guidelines for professionals
We recommend a resolution of 150 dpi (1:1) for optimal results. The desired resolution per card is 1000 x 1000 px, and the minimum file size is 500 × 500 px per card.