Breakdown of El brillo afecta a la saturación.
a
to
afectar
to affect
el brillo
the brightness
la saturación
the colour saturation
Questions & Answers about El brillo afecta a la saturación.
Why does the sentence use el and la?
Because Spanish nouns have grammatical gender. Brillo is masculine, so it takes el. Saturación is feminine, so it takes la.
Spanish also uses the definite article more often than English, especially with general, abstract, or technical ideas. So el brillo and la saturación are very natural here, even if English might sometimes just say brightness and saturation without articles.
Why is it afecta and not afectan?
Why is there an a before la saturación?
With afectar, Spanish very often uses the pattern afectar a algo/alguien to mark what is being affected.
So in:
El brillo afecta a la saturación
the thing being affected is la saturación.
That a does not mean to in a simple word-for-word way. It is just part of the normal structure used with this verb in sentences like this.