Monochrome Manipulation Recap
- The Sabattier effect is simply
maintaining shadows whilst inverting highlights to form a mixed
- Images with smooth reflecting surfaces
are usually suitable, but so are many other images.
- The effect is controlled by fine positioning
of the transition points
- The amount of the effect is controlled by
the positions of the control arrows on the output side of the histogram.
- Assess the tones in the image to identify
tonal ranges and likely transition points before manipulating the image
- Transition points generally lie in smooth
areas of the image that have a tonal gradient
- Itís possible to invert more than one
tonal range. Generally 2 or 3 inversions will produce striking and
- Multiple inversions interact with each
- Build up complex inversions in stages
after considering the image as a whole first.
- Adding and adjusting anchor points will
control the inversions and stretches.
- Interesting effects can be subtle Ė or
- Natural tonal changes can be enhanced,
reversed or manipulated for effect (sky example).
- Achieving these effects in PWP is simple
and easily controllable.
- Posterisation is likely and can enhance
or degrade the image. Use 16bits/channel to minimise the effects.
Generally, like film grain, itís acceptable and enhances images of this
- Many different results are possible from
a single image.
- Solarisation (for our purposes) is a
narrow, strong application of the Sabattier effect.
- All the techniques discussed here will be
used in the colour transformations discussed later.
- Experiment (and have fun)!