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Include additive nature explanation #10

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Include additive nature explanation #10

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10 changes: 5 additions & 5 deletions spec/parts/part1.adoc
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Expand Up @@ -15,12 +15,12 @@
The fifth byte is an ASCII character that can be interpreted as follows:

|===
| Animation | Interlacing | Grayscale | RGB | RGBA
| Animation | Interlacing | Grayscale | RGB | RGBA | Notes

| Still image | Non-interlaced | `'1'` | `'3'` | `'4'`
| Still image | Interlaced | `'A'` | `'C'` | `'D'`
| Animated | Non-interlaced | `'Q'` | `'S'` | `'T'`
| Animated | Interlaced | `'a'` | `'c'` | `'d'`
| Still image | Non-interlaced | `'1'` | `'3'` | `'4'` |
| Still image | Interlaced | `'A'` | `'C'` | `'D'` | For Interlaced, add 0x10 to above values
| Animated | Non-interlaced | `'Q'` | `'S'` | `'T'` | For Animated, add 0x20
| Animated | Interlaced | `'a'` | `'c'` | `'d'` | For both, add 0x30
|===

Variable-size integer encoding (varint):
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