Processing the image

4 Dec

The third part of the DPP course is about processing the image and to be more precisely is it about the value and use of RAW.

RAW is maybe comparable to the negative of a picture. It contains all the “raw” information that the sensor records and in most cases adds just the Gamma-curve to it in order to make it more “normal” looking to our eyes.

JPG on the other hand is the a picture processed inside the camera of the raw data. That can e.g. mean that the black and white conversion is done in the camera, loosing the colour information in the file. That, of course, means that you have less information to use when editing the pictures on you computer. Exposure control in different parts of the picture is done much better in RAW than in JPG because the information is still there to adjust with. The computer does not have to guess how the structures are in the darkest blacks or the whitest whites when adjusting them but has the information in the file. Every information that is not used in the Jpg-file is discarded.

Almost all producers of cameras have a special format matching their cameras. Examples might be the CR2 for Canon or the NEF for Nikon. Hasselblad on the other hand uses an open source format called .DNG which is invented by Adobe in order to unify the different RAW-formats into one.

Very useful is that you can do some adjustment after the shoot, e.g. the white balance. That means that you don’t have to be overly careful to get the white balance spot on during the shoot but can adjust it afterwards.
The next advantage is that the dynamic range is higher in a RAW image in comparison to a JPG image. That makes adjusting easier as mentioned before.

In the following exercises the possibilities of RAW are tested and compared to jpg in both colour and black and white.

Happy and sleepy dog. Captured with mobile phone, using a vintage filter

Happy and sleepy dog. Captured with mobile phone, using a vintage filter


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