| 
| Index1 | Tag Name | Writable | Values / Notes | 
|---|
 
| 4 | PixelFormat | no | [val >> 13 & 0x7] 
  | 0 = Grayscale 1 = 4:2:0 (chroma at 0.5, 0.5)
 2 = 4:2:2 (chroma at 0.5, 0)
 3 = 4:4:4
 4 = 4:2:0 (chroma at 0, 0.5)
 5 = 4:2:2 (chroma at 0, 0)
 | 
 |  
| 4.1 | Alpha | no | [val & 0x1004] 0x0 = No Alpha Plane
 0x4 = Alpha Exists (W color component)
 0x1000 = Alpha Exists (color not premultiplied)
 0x1004 = Alpha Exists (color premultiplied)
 |  
| 4.2 | BitDepth | no | [val >> 8 & 0xf] |  
| 4.3 | ColorSpace | no | [val >> 4 & 0xf] 
  | 0 = YCbCr (BT 601) 1 = RGB
 2 = YCgCo
 3 = YCbCr (BT 709)
 4 = YCbCr (BT 2020)
 5 = BT 2020 Constant Luminance
 | 
 |  
| 4.4 | Flags | no | [val & 0xb] Bit 0 = Animation
 Bit 1 = Limited Range
 Bit 3 = Extension Present
 |  
| 6 | ImageWidth | no |  |  
| 7 | ImageHeight | no |  |  
| 8 | ImageLength | no |  |  |