Mamiya DM System Manuel d'utilisateur télécharger pdf (Page 163)

Chapter 1 - Basic info

155

Chapter 11 - Using the software

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For advanced exposure adjustment, it is recommended that levels are adjusted ﬁrst, followed by

curves. The curves tool has been designed not to clip image information and will only operate on

tones within the deﬁned white and black points of the image.

The correct Level settings

In an ideal situation, levels should be adjusted to slightly clip the end points of the image histogram

at the shadow end and to the maximum highlight level on the right side of the histogram.

The images below show before and after adjusting the levels for an image.

As shown, black point and white point adjustments have been brought in very slightly. This has the

effect of lightening the lighter tones and darkening the shadow tones in the image, at the same

time increasing contrast slightly. The process has to be done very carefully in order to preserve

the feeling that the image evokes.

The highlight warning function can be conﬁgured to provide visual feedback when adjusting the

levels.

Once the highlight and shadow points of the image have been ﬁxed, the density or mid-tone values

of the image can be adjusted using the centre or gamma slider on the levels tool.

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The fastest way to use levels is by using the auto tool as a starting point. This will not clip

information – if the result is not desired you can ﬁne tune the result manually

Highlight warning shows where the

levels should be set – here app 245

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Mamiya DM System Manuel d'utilisateur Page 163