Image Drole: Imagej Macro Get Pixel Value

Imagej Macro Get Pixel Value

You can use then this value to divide all the pixels in you image using divide function under the process math menu. Change pixel values within a macro how can i change a given value for another within a macro.

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If you calculate the mean for each image and use that value to divide each corresponding image your roi should have the same mean value for all roi in your pictures.

Imagej macro get pixel value. Display pixel values this macro displays the values of the pixels in the current image or selection in the results window. Hi i am trying to calculate ndvi normalise difference vegetation index values for every pixel in a series of images in a specified folder. So bear this in mind if you try this macro.

The macro runs but i cannot get it to save the values of each pixel in the results table. See the color picker tool macro for an example that shows how to do this. The width of the image or selection must be 124 pixels or less.

In practice it seems that a simpler version of a gethistogram function would do the job ie simply return an array of pixel values instead of counts. If it is grey scale image you should obtain the gray mean of the grey pixels. One potential issue is that it assumes you have no 0 pixel values within your rois.

Note that pixels in rgb images contain red green and blue components that need to be extracted using shifting and masking. Use getvalue xy to get calibrated pixel values from 8 and 16 bit images and intensity values from rgb images. I am using the macro below.

When the macro is finished only the last pixel value is shown in the results table. For example i want to replace all pixels with value 0 by values 100.

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