Summary The work presented in this dissertation has been dedicated to the investigation of the center-to-limb (CLV) variation of the appearance and brightness of small-scale magnetic features in the solar photosphere, observed at a very high spatial resolution. The goals of this work were to provide both novel observational constraints for MHD models, and a deeper understanding of the relationhip between the features appearing as Bright Points (BPs) and faculae. • A photometric method based on Linear Discriminant Analysis was developed to classify BPs and faculae, after their detection via a segmentation algorithm. Apply- ing this method to images of active regions at various heliocentric angles allowed the determination of a CLV of the relative number of BPs and faculae. • The brightness and morphology of the classified BPs and faculae was statistically investigated. Despite the absence of information about the magnetic field, the re- sults indicate that the frequent
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