Pixel values represent the intensity or color information of an image at a specific point. In a digital image, each pixel (short for "picture element") is a tiny square of color that contributes to the overall image. Pixel values are usually represented by numbers that indicate the intensity of the color or the amount of light at that point. For grayscale images, pixel values typically range from 0 (black) to 255 (white), while color images are represented by three sets of pixel values for red, green, and blue (RGB) channels.
To practically use "pixel value mm²," you must process the image. Here is the standard workflow used in ImageJ (Fiji), MATLAB, or Python (OpenCV). pixel value mm2
Goal: Calculate the area of a metal inclusion in a cross-section (mm²). Pixel values represent the intensity or color information
total_object_pixels = np.sum(mask == 255) total_object_pixels = np