Chemical Images

Command: Image Analysis > Chemical Maps > Designer

Chemical images (or chemical maps, as they are also called) are calculated using arbitrary mathematical formulas which combine the data provided by spectral descriptors into image information. The creation of chemical images is a two step process: first you have to specify the desired relationship using the chemical image editor and store it as an Epina ImageLab script; in a second step the developed chemical image script is applied to the currently loaded data simply by loading and executing this script (see also Special Images).

The chemical image editor offers a simple user interface where you can experiment with various mathematical transformations and combinations of the spectral descriptors. It offers three independent test channels which can be used to compare the results of various mathematical transformations. In order to calculate a chemical map, simply enter the intended equation into the top field and click any of the "fx" buttons in the preview part below.

When a particular chemical image fits your needs you can save the corresponding equation and apply it in the 2D Imager window.

How To: Please follow these steps to create a chemical image:
  1. Load the spectral descriptors.
  2. Enter a formula describing your intentions into the top "Result=" field. The descriptor variables have to be named according to the names in the list of descriptors. Please note that you can easily transfer the name of a descriptor into the formula field by double-clicking the corresponding descriptor.
  3. Click the "fx" button of any of the three preview windows. This will display the image resulting from the application of the formula. You may use the other preview windows for comparing the results of different formulas.
  4. Click the save button of each of the formulas you want to make available as a chemical image and enter a filename of the chemical image. The resulting file can later be used in the 2D Imager to calculate the corresponding chemical image.