Using the display graphs

All graphs have a button at the top-left corner that lets you add graph markers which populate a table below the graph with related image data. You can drag markers along the graph (or in some cases, in the image), dynamically updating the table's information.

Each type of graph produces a different table of information. The Line Profile graph shows the intensity at each pixel along a line. The Histogram graph shows pixel data in a defined region of the selected step's displayed image. The Edge Values graph shows the edge strength of the edges in the search region of the Measurement step or the EdgeLocator step.

For all graphs, you can zoom both the horizontal and vertical axes by scrolling your mouse wheel while hovering over the graph; alternatively, you can zoom a single axis, keeping the other constant, by scrolling your mouse wheel while hovering over the axis on which to zoom. To change the axis, you must first click on the displayed graph.

The Line Profile graph shows the intensity at each pixel along a line. The X-axis represents the distance along the line in calibrated units and the Y-axis represents the pixel intensity. (For an uncalibrated image, the X-axis represents pixel units). To use the graph, select the step whose image you want to analyze, click on the Trace a line profile () toolbar button, and then click on the image to draw a line. You can move the line by clicking on it and dragging it to another location. You can resize or re-orient the line by clicking on either end of the line and dragging that end to another location. A single step can have multiple line profiles.

You are able to place graph markers anywhere along the graph to measure the distance between points on the line. The graph marker is shown both as a line on the graph, and as a small triangle on the line drawn on the image. You can drag the graph marker, either along the graph or the line drawn in the image. Below the graph is a table with data about the graph markers and the extremes of the entire line. The X- and Y-columns on the table represent the X- and Y-coordinates in the image. There is also information about the line itself, such as line angle and length, at the bottom of the window. By default, this information is in calibrated world units; to use pixel units, right-click on the image and uncheck the Calibrated Coordinates context menu item.

The Histogram graph is based on pixel data in the selected step's displayed image. To see the graph, click on the View histogram () toolbar button. The graph's X-axis represents intensity values and the Y-axis represents the number of pixels in the image that have that intensity.

By default, the Histogram graph is for the entire image. To have the Histogram graph display information about a region in the image, first choose the shape of the region by clicking on the Source button at the top of the Histogram graph, and then draw the region on the image. You can move the region once it is drawn. Moving the region dynamically updates the histogram graph.

The Histogram graph has a table that displays pixel information corresponding to where you place the graph marker in the graph. For example, you can establish the exact number of pixels (pixel count) in the region that have the intensity at which you placed the graph marker. The Histogram graph also has a table with statistical information about the entire region, such as the mean pixel value.