Comet Labs WN591 Manual de usuario descargar pdf (Pagina 36)

Help! There is a comet in my computer! 33

white regions, and those regions of the image that have the grey value lower than the grey

value selected with the slider as black regions.

Figure 19. Viewing image histograms and grey values in Photoshop. Image histogram is displayed

using the “Levels” tool (A). Using the “Threshold” tool to analyse the grey value range used in the

image is illustrated in B-D. Note that the “Preview” box (green circle in B) has to be selected in the

“Threshold” window to update image as we drag the slider under the histogram. The current

position of the slider (current threshold grey value) is displayed in the “Threshold Level” box. The

shown threshold grey values are: 201 in B, 151 in C, 36 in D and 26 in E. See text for explanation.

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Comet Labs WN591 Manual de usuario Pagina 36