embossed poster 3d model

Generate a 2.5D embossed poster STL from the uploaded image. The model must remain a thin flat rectangular sheet, like a rigid paper poster. Base thickness: 3mm. Everything that is NOT white in the image must be raised above the surface: - Human figures - All typography - Colored squares - Logos and icons White areas must stay completely flat. Relief height: subtle, between 1mm and 1.8mm. All raised shapes must strictly follow the original 2D outlines. No volumetric sculpture, no rounded statue modeling, no side depth, no extrusion into full 3D forms. Front-facing only. No borders or frames. Smooth edges and clear separation between raised areas for hand painting. Single watertight STL mesh ready for FDM printing. Keep original aspect ratio and layout.