## B.2. ETC Compressed Image Formats

The following formats are described in the “ETC2 Compressed Texture Image Formats” chapter of the Khronos Data Format Specification.

Table B.2. Mapping of Vulkan ETC formats to descriptions

VkFormat | Khronos Data Format Specification description
--- | ---
`VK_FORMAT_ETC2_R8G8B8_UNORM_BLOCK` | RGB ETC2
`VK_FORMAT_ETC2_R8G8B8_SRGB_BLOCK` | RGB ETC2 with sRGB encoding
`VK_FORMAT_ETC2_R8G8B8A1_UNORM_BLOCK` | RGB ETC2 with punch-through alpha
`VK_FORMAT_ETC2_R8G8B8A1_SRGB_BLOCK` | RGB ETC2 with punch-through alpha and sRGB
`VK_FORMAT_ETC2_R8G8B8A8_UNORM_BLOCK` | RGBA ETC2
`VK_FORMAT_ETC2_R8G8B8A8_SRGB_BLOCK` | RGBA ETC2 with sRGB encoding
`VK_FORMAT_EAC_R11_UNORM_BLOCK` | Unsigned R11 EAC
`VK_FORMAT_EAC_R11_SNORM_BLOCK` | Signed R11 EAC
`VK_FORMAT_EAC_R11G11_UNORM_BLOCK` | Unsigned RG11 EAC
`VK_FORMAT_EAC_R11G11_SNORM_BLOCK` | Signed RG11 EAC