![]() A setMinAndMax() macro call is generated if the command recorder is running. Each additional click on Auto increases the number of saturated pixels and thus the amount of optimization.Ĭlick on Set to enter the window level (center) and width values in a dialog box. The optimization is done by allowing a small percentage of pixels in the the image to become saturated (displayed as black or white). Create a selection, and the entire image will be optimized based on an analysis of the selection. This command interactively alters the window (range of minimum and maximum) and level (position of that range in the greyscale intensity space) of the active imageĬlick on Auto, and ImageJ will automatically optimizes window and level based on an analysis of the image's histogram. For composite images it propagates the current image's display range to the other channels. This is the only B&C option that alters the pixel data of non-RGB images. This option currently only works with 8-bit images and stacks and with RGB stacks. If there is a selection, only pixels within the selection are modified. Check Propagate to all open images to apply these values to the rest of the images currently open.Ĭlick on Apply to apply the current display range mapping function to the pixel data. A resetMinAndMax() macro call is generated if the command recorder is running.Ĭlick on Set to enter the minimum and maximum display range values in a dialog box. The display range is set to the full pixel value range of the image. Each additional click on Auto increases the number of saturated pixels and thus the amount of optimization.Ĭlick on Reset to restore the original brightness and contrast settings. ![]() The narrower the display range, the higher the contrast.Ĭlick on Auto, and ImageJ will automatically optimizes brightness and contrast based on an analysis of the image's histogram. Contrast increases or decreases contrast by varying the width of the display range. Brightness increases or decreases image brightness by moving the display range. Minimum and Maximum control the lower and upper limits of the display range. Pixels with a value less than the minimum are displayed as black and those with a value greater than the maximum are displayed as white. ImageJ displays images by linearly mapping pixel values in the display range to display values in the range 0-255. These two values define the display range, or “window”. The two numbers under the plot are the minimum and maximum displayed pixel values. The line graph at the top of the window, which us superimposed on the image's histogram, shows how pixel values are mapped to 8-bit (0-255) display values. Press shift-c to open the B&C window the quick and easy way. Brightness and contrast of RGB images are changed by modifying the pixel values. With 16-bit and 32-bit images, the display is updated by changing the mapping from pixel values to 8-bit display values, so pixel pixel values are also unchanged. With 8-bit images, brightness and contrast are changed by updating the image's look-up table (LUT), so pixel values are unchanged until the “Apply” button is pressed. ![]() Use this tool to interactively alter the brightness and contrast of the active image. ![]()
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