fotografisch
photographic
Relating to photography; belonging to photography or working with photographic means.
Für das Projekt sind grundlegende fotografische Kenntnisse erforderlich.
Basic photographic knowledge is required for the project.

photographic
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photographic
Relating to photography; belonging to photography or working with photographic means.
Für das Projekt sind grundlegende fotografische Kenntnisse erforderlich.
Basic photographic knowledge is required for the project.

The adjective 'fotografisch' (photographic) belongs to the word family of 'die Fotografie' (photography) and 'der Fotograf' (photographer). The ending '-isch' indicates that it is an adjective meaning 'in the manner of' or 'relating to'.
Sie hat ihr fotografisches Talent von ihrem Vater geerbt.
She inherited her photographic talent from her father.
In its main meaning, 'fotografisch' (photographic) is often combined with nouns from the fields of technology, art, or learning. Typical examples are 'fotografische Ausrüstung' (photographic equipment), 'fotografische Techniken' (photographic techniques), or 'etwas fotografisch festhalten' (to capture something photographically).
Der Künstler hält die Veränderungen der Landschaft fotografisch fest.
The artist captures the changes in the landscape photographically.
In its figurative meaning, 'fotografisch' (photographic) is used almost exclusively in the fixed expression 'ein fotografisches Gedächtnis' (a photographic memory). This describes the ability to remember visual information very precisely.
Meine Schwester hat ein fotografisches Gedächtnis und vergisst nie ein Gesicht.
My sister has a photographic memory and never forgets a face.
realistic
'realistisch' and 'fotografisch' can both describe something that looks very exactly like reality. 'realistisch' says more generally that a depiction seems natural and true to life, for example in a picture or a novel. 'fotografisch' emphasizes especially accurate detail, almost as if something had been captured with a camera. They can be confused when talking about art or images. 'realistisch' is broader, while 'fotografisch' only fits when photo-like accuracy is important.

Der Künstler malt Gesichter so fotografisch, dass man jede Falte erkennt.
The artist paints faces so photographically that you can see every wrinkle.
Der Film zeigt das Leben in der Großstadt sehr realistisch.
The film shows life in the big city very realistically.