But what does this look like for actual images, like identifying diabetic retinopathy from an ocular photograph? Images are made out of pixels rather than letters. In a digital context, a pixel is the smallest, controllable unit of an image represented on a display. Each pixel is a representation of a tiny portion of the original image. Think about pixels like creating a drawing with dots where every dot has a color value and an intensity. The more dots used, the clearer the image becomes. The filters a CNN uses in that first layer are small squares of pixels that correspond