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.
Depending on the chosen tile size, use the following guidelines:
For 10 x 10 cm cards, a photo should be between 300 and 500 pixels.
For 20 x 20 cm cards, a photo should be between 600 and 1,000 pixels.
If you're creating a collage with one photo per card, follow the guidelines above for each photo. If you want to enlarge one photo over multiple cards, you'll need to do some math. For example: if your enlargement is 100 cm wide, then your photo should be between 3,000 and 5,000 pixels. (5 cards of 20 x 20 cm. 5 x 600 - 1,000 = 3,000 - 5,000).
Visual quality
In addition to technical quality, it's also important to assess visual quality thoroughly. You can read more about this in this article.
Can I use a screenshot?
You can read more about it in this article.
Color
Both RGB and CMYK are possible. RGB colors are converted to CMYK in the printing process. Please note: due to this process and your screen settings, (bright) colors on your screen may differ slightly from the final print. Synaps, the material used to make an IXXI, is matte and does not have a glossy finish like photo paper.
Accepted file formats
jpg, jpeg, and png
Resolution guidelines for professionals
We recommend a resolution of 150 dpi (1:1) for optimal results. This equates to 1000 x 1000 px per card, with a minimum file size of 500 × 500 px per card.