## B.3. ASTC Compressed Image Formats

ASTC formats are described in the “ASTC Compressed Texture Image Formats” chapter of the Khronos Data Format Specification.

Table B.3. Mapping of Vulkan ASTC formats to descriptions

VkFormat | Compressed texel block dimensions | sRGB-encoded
--- | --- | ---
`VK_FORMAT_ASTC_4x4_UNORM_BLOCK` | 4 × 4 | No
`VK_FORMAT_ASTC_4x4_SRGB_BLOCK` | 4 × 4 | Yes
`VK_FORMAT_ASTC_5x4_UNORM_BLOCK` | 5 × 4 | No
`VK_FORMAT_ASTC_5x4_SRGB_BLOCK` | 5 × 4 | Yes
`VK_FORMAT_ASTC_5x5_UNORM_BLOCK` | 5 × 5 | No
`VK_FORMAT_ASTC_5x5_SRGB_BLOCK` | 5 × 5 | Yes
`VK_FORMAT_ASTC_6x5_UNORM_BLOCK` | 6 × 5 | No
`VK_FORMAT_ASTC_6x5_SRGB_BLOCK` | 6 × 5 | Yes
`VK_FORMAT_ASTC_6x6_UNORM_BLOCK` | 6 × 6 | No
`VK_FORMAT_ASTC_6x6_SRGB_BLOCK` | 6 × 6 | Yes
`VK_FORMAT_ASTC_8x5_UNORM_BLOCK` | 8 × 5 | No
`VK_FORMAT_ASTC_8x5_SRGB_BLOCK` | 8 × 5 | Yes
`VK_FORMAT_ASTC_8x6_UNORM_BLOCK` | 8 × 6 | No
`VK_FORMAT_ASTC_8x6_SRGB_BLOCK` | 8 × 6 | Yes
`VK_FORMAT_ASTC_8x8_UNORM_BLOCK` | 8 × 8 | No
`VK_FORMAT_ASTC_8x8_SRGB_BLOCK` | 8 × 8 | Yes
`VK_FORMAT_ASTC_10x5_UNORM_BLOCK` | 10 × 5 | No
`VK_FORMAT_ASTC_10x5_SRGB_BLOCK` | 10 × 5 | Yes
`VK_FORMAT_ASTC_10x6_UNORM_BLOCK` | 10 × 6 | No
`VK_FORMAT_ASTC_10x6_SRGB_BLOCK` | 10 × 6 | Yes
`VK_FORMAT_ASTC_10x8_UNORM_BLOCK` | 10 × 8 | No
`VK_FORMAT_ASTC_10x8_SRGB_BLOCK` | 10 × 8 | Yes
`VK_FORMAT_ASTC_10x10_UNORM_BLOCK` | 10 × 10 | No
`VK_FORMAT_ASTC_10x10_SRGB_BLOCK` | 10 × 10 | Yes
`VK_FORMAT_ASTC_12x10_UNORM_BLOCK` | 12 × 10 | No
`VK_FORMAT_ASTC_12x10_SRGB_BLOCK` | 12 × 10 | Yes
`VK_FORMAT_ASTC_12x12_UNORM_BLOCK` | 12 × 12 | No
`VK_FORMAT_ASTC_12x12_SRGB_BLOCK` | 12 × 12 | Yes