contrast

Examples of contrast in the following topics:

• Specialty Microscopes and Contrast

  • In optical microscopes, the better the contrast between the image and the surface it is being viewed on, the better the resolution will be to the viewer.
  • There are many illumination techniques to generate improved contrast.
  • With the bright field technique the object is illuminated from below to increase the contrast in the image seen by viewers.

• Enhancement of Microscopy

  • Bright field: This technique increases the contrast by illuminating the surface on which the objects sit from below.
  • Dark field: This technique is good for improving the contrast of transparent objects.
  • Phase contrast: This uses the refractive index of an object to show differences in optical density as a difference in contrast. provides a demonstration of this technique.

• NMR and MRIs

  • MRI shows a marked contrast between the different soft tissues of the body, making it especially useful in imaging the brain, the muscles, the heart, and cancerous tissue—as compared with other medical imaging techniques such as computed tomography (CT) or X-rays.
  • MRI contrast agents may be injected intravenously to enhance the appearance of blood vessels, tumors or inflammation.

• Average Velocity: A Graphical Interpretation

  • In contrast, average velocity is defined as the change in position (or displacement) over the total time of travel .

• Resolution of the Human Eye

  • The retina of human eye has a static contrast ratio of around 100:1 (about 6.5 f-stops).
  • Hence, a dynamic contrast ratio of about 1,000,000:1 (about 20 f-stops) is possible.

• Constant Pressure and Volume

• Pumps and the Heart

• Scalars vs. Vectors

  • In contrast, scalars require only the magnitude.

• Mass

  • In contrast, the mass of an object is an intrinsic property and remains the same regardless of gravitational fields.

• Components of a Vector