While the cuttlefish's bones make canaries very happy, and its flesh delights many a gourmet, the colouring matter that it secretes - sepia - is used by painters to do wash drawings. It is also a colouring bath that was very much appreciated in the old days for staining - that is to say, toning - photos. Computer graphics now allows you to tone a photo quickly without you having to put on your fishing clothes.

Take a look at the figure below. The photo on the left shows the pilot of a Fokker DR-1 (a plane from the First World War), photographed at an air display. Processing the colours with sepia toning (photo on the right) will give the idea of an authentic period photo.




Contents:

- Eliminating the Colours

- Lightening

- Sepia Colourization

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