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Keywords from Image Description:
Camera obscuraSobelKombination. de January Camera Obscura mit horizontalem und vertikalem Sobel gefalten und kombiniert Da auch negative Werte entstehen wird der Nullpunkt als mittleres Grau dargestellt Aus Public Domain Bild im Wikkipedia selber berechnet Benutzer Kunkis und andere Public Domain PDrelease Original upload log