| sample depth | Overview of Image Properties |
| Satori | Other Image Editors - Part 2 |
| saturation-preserving rendering | Color Management Systems and sRGB |
| SAVE | Image Display, Manipulation, and Control |
| sBIT | Significant Bits (sBIT) |
| sBIT (significant bits) chunk | Significant Bits (sBIT) |
| | Writing PNG Images |
| sCAL | Physical Scale (sCAL) |
| sCAL (physical scale) chunk | Physical Scale (sCAL) |
| Schalnat, Guy Eric | Implementation |
| screendoor transparency | Cosmo Player |
| SEA image viewer | DOS |
| second edition | About the Second Edition |
| SEEK | Image Display, Manipulation, and Control |
| server-side support | WWW Servers |
| setjmp() | readpng2_init() |
| | writepng_init() |
| Shake | Other Image Editors - Part 2 |
| Shekter, Jonathan | Anatomy of an Internet Working Group |
| SHOW | Image Display, Manipulation, and Control |
| signature | PNG Signature |
| significant bits | Significant Bits (sBIT) |
| significant-bits chunk | Significant Bits (sBIT) |
| | Writing PNG Images |
| sleep() | readpng2_decode_data() |
| slide shows | Common Applications of MNG |
| sliding window concept | The Deflate Compression Algorithm |
| SmartSaver | Other Conversion Programs |
| smoothing and centered pixel replication | Interlacing and Progressive Display |
| source code | Getting the Source Code |
| | Getting the Source Code |
| | Source Code |
| specification | Latin-1 Text Annotations (tEXt, zTXt) |
| spectral selection | Interlacing and Progressive Display |
| sPLT | Suggested Palette (sPLT) |
| sPLT (suggested palette) chunk | RGB |
| | Suggested Palette (sPLT) |
| Spr2Png | Other Conversion Programs |
| sRGB | Color Management Systems and sRGB |
| sRGB chunk | Color Management Systems and sRGB |
| | Writing PNG Images |
| sRGB color space | Gamma and Color Correction |
| | Photoshop 5 |
| | Color Management Systems and sRGB |
| standardization of PNG format | Mainstream Support and Present Status |
| | ICC Profiles |
| | International Text Annotations (iTXt) |
| stippled alpha | Cosmo Player |
| Storer | The Deflate Compression Algorithm |
| strips (TIFF interlacing) | Interlacing and Progressive Display |
| structs, accessing | readpng2_info_callback() |
| structure of MNG | MNG Structure |
| | Image-Defining Chunks |
| | Image Display, Manipulation, and Control |
| successive approximation | Interlacing and Progressive Display |
| suggested palette | Suggested Palette (sPLT) |
| suggested palette (sPLT) chunk | RGB |
| | Suggested Palette (sPLT) |
| SViewII image viewer | Amiga |
| system gamma | The gAMA Chunk |
| Szymanski | The Deflate Compression Algorithm |
