Histogram are outside of the selected range. Values for a given channel to represent those data values in which 2 percent of them in the The 2 Percent Tails Clipped choice will cause the selected begin and end range of data However, if the actual range of the data is only 50 to 150, then theĭata will only be represented by grays not black to white there will not be much contrast in Lowest display value (black) and 255 to be the last data value displayed for the highestĭisplay value (white).
Possible in the image, 0 for 8-bit unsigned data, to be the first data value displayed for The “Entire Range” choice for this option would cause lowest data value Histogram to be used for assigning the pixels in the gray scale intervals defined by the
Linear, equal area and Gaussian stretches are illustrated in figure above left to right.Ģ.4 The Min-maxes option allows one to select the beginning and end data values of the image Popup menu with the left button, you can change the number of standard deviations that theĭata will be fit to for the Gaussian selection. The 'Right Mouse button down (Windows version) before you select the enhancement If one holds the 'Option' key down (Mac version) or Gaussian selection causes the distribution of the number of pixels assigned to the gray scale Though nonlinear, the equal area stretch will provide maximum contrast. Stretch choice causes them to be set so that each interval represents about the same number Stretch, gray scale intervals are equally spaced over the data range, while the Equal Area There are three choices for Stretch: Linear, Equal Area and Gaussian. They control the process by which each possible data value in the image data is The figure below illustrates 0’s treatedĪs black on the left and 0’s as white on the right.Ģ.3 The Stretch and Min-maxes are usually the options used to enhance different parts of the To cause 0’s in all channels to be displayed as white. However, if 0’sĪctually represent background or ‘no data’, one may want to select the background option The figure above illustrates 256 display levels per channel (millions of colors) on the leftĪnd 2 display levels per channel (8 colors) on the right.Ģ.2 The Treat ‘0’ as data setting causes 0 values to be displayed as black. Values if one wishes to see what the affects are. Monitors now days for the maximum number of colors possible. One can control the enhancement of the image in the multispectral image window by setting fiveĭifferent options in the Enhancement portion of the Display Specifications dialog box includingīits of color, Stretch, Min-maxes, Treat ‘0’ as and Display levels per channel.Ģ.1 The “Bits of color” default is 24 and the “Display levels per channel” default is 256 for all Guidelines given in exercise 1 (Display and Inspection of Image Data with MultiSpec). Open the image if it is not already displayed in a multispectral image window following the
#MULTISPEC 996027 DOWNLOAD#
Requirements: MultiSpec application and image titled “ag020522_DPAC_cd.lan”., which you can download here.
In this exercise, you will display an aircraft image of a portion of the Davis Purdue Agriculture Center in Randolf County, Indiana and view the data in several ways using MultiSpec.
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