Combining contrast methods
In prior posts we described a simple method, "Radial-3D Masking," for microscope image enhancement with could produce both contrast enhancement and a perception of "3D" (relief effect).
However, while useful on its own, it is also possible to combine this method with at least one other popular contrast method, namely, "Circular Oblique Lighting", ("COL"). This new method has the potential to not only further improve contrast levels in the COL image, but also to add a 3D effect.
Unfortunately, the results of this combination, in some instances, can become a bit excessive. For this reason we will introduce a more moderate version of the Radial-3d Method, termed here the "Diffuse Half-Mask" ("DHM") method.
This is. basically, little more than half of the Radial-3d Method, using only a single diffusion strip, rather than two. It produces results that are a bit less dramatic than the Radial-3d Method, but which may be better-suited for combining with other optical contrast methods. Details of this method, as well as the original Radial-3d Method are shown below:
Examples of just how simple and effective these "combo" contrast methods can be are depicted in the photo set immediately below.
The image set on the left depicts increasing levels of "3D" effect, beginning with 'Brightfield' (no 3d enhancement), then 'DHM' (moderate 3D enhancement) and, finally, 'Radial-3D' (full 3D enhancement).
The image set on the right depicts the same series, but now in combination with COL.
Click anywhere on the above image for larger versions.
In general, these methods appear to be most effective when applied to subjects which exhibit fine structural detail. Still, they may also be useful with less demanding specimens, as shown in the next photo set:
Click anywhere on the above image for larger versions.
In any case, thoughtful experimentation is highly recommended!
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