Mamiya DM System Bedienungsanleitung PDF herunterladen (Seite 164)

Chapter 1 - Basic info

156

Chapter 11 - Using the software

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How to work with curves

Levels are used to control the overall tonal distribution of an image. Curves provide the ability to

remap the area within the shadow and highlight limits set by the Levels tool areas to produce a

desired image.

There are certain ‘classic’ curves that are used in image applications to achieve speciﬁc results in

images. Best known is the “S” curve which is used to increase contrast in an image.

The S curve achieves the increase in contrast by pulling down the shadow values, normally on the

quarter tones and increasing the values of the tones at the three-quarter tone mark as shown in

the image.

The brightness values at the quarter tones, before applying the curve, are around 65 (with image

tonal values from black 0 to white at 255). The curve darkens these tones to around 50, whilst

the three-quarter tones at 190 are raised to 200, lightening them in the ﬁnal image.

The inverse S curve has the opposite effect of lightening the shadows and darkening the highlight

tones, causing a reduction in contrast.

For advanced use, the Pick Curve point picker tool (p) can be used to pick a speciﬁc tonal area

within an image. This value is added to the curve to allow adjustment of the values for that part of

the image.

The image below clearly shows how the value picked on the image translates to the image curve.

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Mamiya DM System Bedienungsanleitung Seite 164