## BPG Tags

The information listed below is extracted from BPG (Better Portable Graphics) images. See http://bellard.org/bpg/ for the specification.

> 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 |

## BPG Extensions Tags

> Tag ID | Tag Name | Writable | Values / Notes
> --- | --- | --- | ---
> 0x0001 | EXIF | - | --> EXIF Tags
> 0x0002 | ICC_Profile | - | --> ICC_Profile Tags
> 0x0003 | XMP | - | --> XMP Tags
> 0x0004 | ThumbnailBPG | no |
> 0x0005 | AnimationControl? | no |

(This document generated automatically by Image::ExifTool::BuildTagLookup)
Last revised Oct 24, 2018

<-- ExifTool Tag Names