Color-color diagrams for all sources with multiwavelength photometry in the core region of the Fornax galaxy cluster. Gray points show the full photometric sample, while colored points highlight spectroscopically confirmed objects: GCs (blue), stars (gold), and galaxies (purple; see Sect. 4.2). All diagrams display the same set of sources from the NGFS + DES DR2 cross-matched catalog, with photometric coverage in the u′g′r′i′z′Y bands (see Sect. 6).