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→Emulation issues
On real hardware, many PS1 games displayed dithering to varying degrees due to a low color depth. Most hardware-rendered plugins use 32-bit color depth, which removes dithering, while software-rendered plugins and emulators tend to retain it. While higher color depth can be considered an enhancement, since it results in less noise and smooth gradients, some think of dithering as seen on real hardware as added shading and texture, especially on untextured polygons. A few software-rendered emulators, such as PCSX-reARMed and the libretro fork of Mednafen, are capable of increasing internal resolution while still retaining dithering, which keeps the shading/texturing aspect while making it more subtle by making the dithering artifacts smaller.
==CD format==
PSX games use the CD-ROM XA (eXtended Architecture) format which is based on CDi and allows developers to use both CD-ROM and CD-DA (audio) tracks on the same disc.
Certain image formats and CD dumping methods don't support this format correctly and end up with the CD-DA tracks missing or corrupted, hence no audio. The ISO format in particular only stores the content of a CD-ROM filesystem and cannot store CD-DA tracks at all so it's generally a very bad idea to use ISO for PSX games (even though it should work for games which are single track).
==Resources==
