MyScope
training for advanced research

Glossary terms about Contrast

Contrast

Referring to the appearance of an image: the extent to which various parts of an image differ in brightness.

▼2 more terms contain Contrast

Contrast

Referring to the appearance of an image: the extent to which various parts of an image differ in brightness.

Topographic contrast

Contrast from the specimen arising from its surface shape (or topography)

Compositional Contrast

Contrast from the specimen arising from local changes in surface chemistry

12 pages mention Contrast

Applications and practical uses - what the TEM can do

Tilt a sample and collect a series of images to construct a 3-dimensional image. Analyse the composition and some bonding differences (through contrast and by using spectroscopy techniques: microanalysis and electron energy loss). 

Background information - What is transmission electron microscopy?

 

Focus/stigmation

Note the increased contrast in the right image. 

Image appearance

At high magnification, crystals may exhibit diffraction contrast. 

Image types

This aperture enhances the contrast in the image. 

Images from electrons

 

Imaging mode setup

It is used to increase contrast and is introduced into the column for bright field and dark field imaging. 

Machine settings

 

Organic sample/physical science specimen preparation for TEM

 

Spherical aberration

 

The electron wavelength

 

What content is right for me?

bright field). how to use the apertures (both the condenser and objective) to enhance contrast [see