¿Por qué muchas de las imágenes astronómicas están en blanco y negro?

¿Por qué muchas de las imágenes astronómicas están en blanco y negro?

Eso se debe a que la mayoría de las cámaras utilizadas para estos fines son ‘monocromáticas’, en blanco y negro para que nos entendamos. Esto es así ya que una cámara monocromática es entre 3 y 4 veces más sensible a la luz y puede obtener imágenes con alrededor de un 66% más de resolución.

Precisamente por eso es que la mayoría de las cámaras en las misiones espaciales son monocromáticas, obtienen más información.

Antes: Fotografía captada el 6 de noviembre del 2020, desde la ciudad de San Lorenzo, Paraguay. En blanco y negro. Esta magnífica nebulosa, también conocida como NGC 2070, se encuentra en la Nube Mayor de Magallanes, una galaxia cercana ubicada a 170.000 años luz del sistema solar.
Después: Fotografía captada el 6 de noviembre del 2020, desde la ciudad de San Lorenzo, Paraguay. A colores. NGC 2070. Para lograr esta fotografía integré 12 horas de datos, principalmente en hidrógeno alfa y el correspondiente RGB para el color.

Entonces ¿De dónde sale el color? Pues de fotografías que contengan los datos de dicho color. Esas imágenes son tomadas mediante filtros que dejen pasar solo un tipo de luz, el rojo, el verde y el azul (en inglés red, green y blue, el famoso RGB).

De esta forma obtenemos por separado la imagen del objeto por un lado y los datos de color, luego se las junta mediante algún software específico (existe una gran variedad) y se obtiene la tan ansiada imagen a color.

Pedro Francisco Acosta Melo

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