Pixel size is set by the resolution of the raster image based on the number of pixels per inch. The image is made from a fixed number of pixels, but the size of a pixel is not defined. Raster images, (JPEG, BITMAP, PNG, TIFF) are created by a grid of coloured squares, called pixels. Difference between Vector Graphics and Raster Images
Not all image types are suitable for generating g-code for CNC machines. Therefore, if we want to make something on a CNC machine we first need a scaled, mathematical model of it. The programs that control a CNC machine are generated mathematically from a digital model of the object or design that is to be created. Movement of a CNC machine is controlled by programs (G-Code) which move the machine to specific positions or along specific paths.
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