Example implementations relate to emulating 3D texture patterns in a printer system. One example implementation determines a 3D texture pattern data having a number of pattern pixels at different heights and associated with respective surfaces of a corresponding 3D texture pattern. Luminance change data is determined for each pattern pixel depending on an angle between a normal vector of the respective surface and a simulated light vector. Image data is obtained having a number of image pixels and the luminance of each image pixel is adjusted depending on the luminance change data of a corresponding pattern pixel in order to generate an image with an emulated 3D texture pattern.