4/16/2024 0 Comments Changing scale bar PIV imagejUse Analyze>Measure (with "Limit to Threshold" in Analyze>Set Measurements checked) The thresholded features are displayed in red and background is displayed in grayscale. Use this tool to automatically or interactively set lower and upper threshold values, segmenting the image into features of interest andīackground. Press 'r' ( File>Revert) to revert to the initial display range. To display the DICOM tags, press 'i' ( Image>Show Info). Press 'h' ( Analyze>Histogram) and you will see that the minimum pixel value in the image is -719 and Click Reset and the display range is set to -719 to 1402. Window Center of 50 and Window Width of 500, so the display range is set to -200 to 300 As an example, the File>Open Samples>CT image has a Click Reset and it sets the display range to the With DICOM images, ImageJ sets the initial display range based on the Window Center (0028,1050)Īnd Window Width (0028,1051) tags. 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 stacksĪnd with RGB stacks. If there is a selection, only pixels within the selection are modified. The display range is set to the full pixel value range of the image.Ī 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.Ī setMinAndMax() macro call is generated if the command recorder is running.Īpply the current display range mapping function to the pixel data. Each additionalĬlick on Auto increases the number of saturated pixels and thus the amount of optimization.īrightness and contrast settings. Percentage of pixels in the the image to become saturated (displayed as black or white). The optimization is done by allowing a small The entire image will be optimized based on an analysis of the selection. The narrower the display range, the higher the contrast.Īutomatically optimize 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. Minimum and Maximum control the lower and upper limits ofīrightness increases or decreases image brightness by moving theĭisplay range. Pixels with a value less than the minimum are displayed asīlack and those with a value greater than the maximum are displayed as white. 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. Shows how pixel values are mapped to 8-bit (0-255) display values. The line graph at the top of the window, which us superimposed on the image's histogram, Press shift-c to open the B&C window the quick and easy way. So pixel pixel values are also unchanged.īrightness and contrast of RGB images are changed by modifying the pixel values. Updated by changing the mapping from pixel values to 8-bit display values, With 16-bit and 32-bit images, the display is With 8-bit images, brightness and contrast are changed by updating the image's look-up table (LUT), Use this tool to interactively alter the brightness and contrast of the active image. The * indicates that both single images and stacks can be converted.Īdjust brightness/contrast, threshold levels and image size. The active image must be RGB color.Īn attempt to perform an unsupported conversion causes a dialog box to be displayed that lists the possible conversions. The active image must be RGB color.Ĭonverts to a 3-slice (hue, saturation andīrightness) stack. Image must be grayscale, 8-bit Color, or an RGB (red, green, blue) or HSB (hue, saturation and brightness) stack. A dialog box allows the number of colors (2-256) to be specified. Heckbert's median-cut color quantization algorithm. The active image must be 8-bit grayscale or 16-bit grayscale. TheĪctive image must be 8-bit grayscale or 32-bit grayscale. Gray=0.299red+0.587green+0.114blue if "Weighted RGB to Grayscale Conversion" is checkedĬonverts to unsigned 16-bit grayscale. Grayscale using the formula gray=(red+green+blue)/3 or This scaling is not done if "Scale When Converting" is not checked in Edit>Options>Conversions. Image>Show Info displays these two values as the "Display range". Where min and max are the two values displayed in the Image>Adjust>Brightness>Contrast ImageJ converts 16-bit and 32-bit images and stacks to 8-bits by linearly scaling from min-max to 0-255, The active image must be 16-bit grayscale, 32-bit grayscale, 8-bit color or RGB color. Use this submenu to determine the type of the active image or to convert it to another type. Home | contents | previous | next Image Menu
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