SLP.- La Secretar\u00eda de Cultura (SECULT), invita a la inauguraci\u00f3n de la exposici\u00f3n \u201cDe retratos, paisajes y bodegones\u201d, del maestro, alumnas y alumnos del Taller de Fotograf\u00eda de la Casa de Cultura del Barrio de San Sebasti\u00e1n, el viernes 14 de febrero a las 19:00 horas, en la Casa de Cultura del Barrio San Sebasti\u00e1n, con la entrada libre.<\/p>\n
En esta exposici\u00f3n participan Agust\u00edn Garc\u00eda Mendoza, alumnas y alumnos del Taller de Fotograf\u00eda de la Casa de Cultura del Barrio San Sebasti\u00e1n, Mariola Guadalupe Faticati Meraz, Laura Rojas L\u00f3pez, Michelle Vaca Gonz\u00e1lez, Leoncia Ch\u00e1vez Lozano, Miguel \u00c1ngel Ibarra Fraga, Juan Jos\u00e9 Mar\u00edn Moyeda, Sergio Ra\u00fal Briones C\u00e1rdenas, presentando fotograf\u00edas logradas con diversas t\u00e9cnicas como la h\u00edbrida, la cianotipia, fotograma, an\u00e1loga, digital y restauradas.<\/p>\n
Se le llama t\u00e9cnica h\u00edbrida cuando una parte de la imagen esta en blanco y negro y la otra est\u00e1 en color.<\/p>\n
La cianotipia es un procedimiento fotogr\u00e1fico monocromo, que consigue una impresi\u00f3n o copia negativa del original en un color azul de Prusia, porque usa en su proceso sales de hierro que producen ese color cuando son expuestas a la luz. La imagen se fija lav\u00e1ndola para eliminar el exceso de sales. Fue una de las primeras t\u00e9cnicas de impresi\u00f3n fotogr\u00e1fica (negativo-positivo) que no utiliza plata en el proceso fotoqu\u00edmico.<\/p>\n
Lo invent\u00f3 en Inglaterra el matem\u00e1tico y astr\u00f3nomo John Hershell en el a\u00f1o 1842. A fines del siglo XIX la cianotipia fue muy popular, ya que permit\u00eda realizar impresiones econ\u00f3micas sobre soportes como papel, cer\u00e1mica, telas, piel o madera. En 1879 se present\u00f3 como una tecnolog\u00eda de punta para reproducir planos, dibujos de piezas mec\u00e1nicas, etc., uso que se le dio hasta la segunda mitad del siglo XX.<\/p>\n
Las primeras fotograf\u00edas fueron con frecuencia fotogramas. Es una imagen fotogr\u00e1fica obtenida sin el uso de una c\u00e1mara mediante la colocaci\u00f3n de objetos por encima de una superficie fotosensible como una pel\u00edcula o papel fotogr\u00e1fico y la exposici\u00f3n posterior a la luz directa. La direcci\u00f3n de la luz incide sobre los objetos, el color de la fuente luminosa y el movimiento de los objetos influyen en el resultado.<\/p>\n
Las fotos de restauraci\u00f3n presentan primero la foto tal y como estaba y enseguida la fotograf\u00eda ya restaurada a la que se le da un color semejante al sepia o caf\u00e9.<\/p>\n
La fotograf\u00eda an\u00e1loga o anal\u00f3gica, de rollo o de carrete, tambi\u00e9n se conoce como fotograf\u00eda tradicional, arg\u00e9ntica o qu\u00edmica, es la que en su proceso utiliza t\u00e9cnicas no digitales para producir im\u00e1genes. Se basa habitualmente en un proceso fisicoqu\u00edmico que involucra el uso de un material fotosensible activo para la obtenci\u00f3n y el procesado de las im\u00e1genes. La fotograf\u00eda tradicional incluye el correcto manejo de grados de sensibilidad de pel\u00edculas y papeles, el manejo de gran variedad de lentes, filtros y fuentes de luz, y la habilidad o cuidado de temperaturas, concentraciones y tiempos de uso con l\u200b\u200b\u200b\u200b\u200b\u200b\u00edquidos reveladores y fijadores.<\/p>\n
La fotograf\u00eda digital consiste en la obtenci\u00f3n de im\u00e1genes mediante una c\u00e1mara oscura. Las im\u00e1genes son capturadas por un sensor de imagen que dispone de m\u00faltiples unidades fotosensibles, las cuales aprovechan el efecto fotoel\u00e9ctrico para convertir la luz en una se\u00f1al el\u00e9ctrica, la cual es digitalizada y almacenada en una memoria.<\/p>\n
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SLP.- La Secretar\u00eda de Cultura (SECULT), invita a la inauguraci\u00f3n de la exposici\u00f3n \u201cDe retratos, paisajes y bodegones\u201d, del maestro, alumnas y alumnos del Taller de Fotograf\u00eda de la Casa de Cultura del Barrio de San Sebasti\u00e1n, el viernes 14 de febrero a las 19:00 horas, en la Casa de Cultura del Barrio San Sebasti\u00e1n, 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