Super Hi-Res Graphics on Apple IIGS: Pushing the Limits of Image Quality - KansasFest 2022
Explore the intricacies of Super Hi-Res graphics on the Apple //gs in this KansasFest 2022 conference talk. Delve into the 320x200 resolution display mode with 256 colors from a 4096-color palette, understanding the constraints and challenges in image conversion. Learn how Kris Kennaway extended the ][-Pix tool to support 320x200 SHR, pushing the limits of Apple //gs image quality. Discover the memory layout, Scanline Control Byte, color palettes, and pixel color mapping for both 320 and 640 modes. Follow the image conversion process, including scanline-to-palette mapping, brute force computation, and heuristics. Gain insights into iterative approaches, palette selection, pixel cloud analysis, and k-means clustering for optimal image quality. Examine examples showcasing quality progression, discuss limitations, and explore future possibilities for Super Hi-Res graphics on the Apple //gs.