Display RAM means that in the process of using Photoshop software, when applying filters to simulate light effects, the software needs to use the computer's memory (RAM) to store and process a large number of image data and filter effects to achieve the purpose of rendering light effects. RAM (Random Access Memory) is the temporary memory of a computer, which is used to temporarily store running programs and data, including temporary data and calculation results required for image processing. Therefore, display RAM refers to the amount of computer memory space occupied while processing lighting effects. Through reasonable management and optimization of RAM, the efficiency of image processing and the quality of rendering lighting effect can be improved.