![]() ![]() Open the Threshold… ↑ tool ( Shift T) and adjust the threshold levels so that the curve is highlighted in red.Alternatively, use one of the drawing tools ( Pencil↑ or Brush↑) to paint directly in background color. Use any of the Area Selection Tools↑ as an eraser (press Backspace to erase) in order to isolate the single graph curve to be measured. Set background color to white using the Color Picker Tool↑ or the Color Picker window↑.Analyze Line Graph will assume that the graph is displayed on a white background so images with darker backgrounds must be adjusted beforehand ( see e.g., Edit ▷ Invert ↑ and Process ▷Binary ▷ Make Binary↑). Make sure your graph is a grayscale image ( Image ▷ Type ▷↑8-bit). For practice, use the File ▷ Open Samples ▷↑Line Graph (21K) sample image. The following procedure describes how to use it: This command uses the Particle Analyzer↑ to extract sets of coordinate data from digitized line graphs. ![]()
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