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Android 2D Texture Overrides

This page details the Texture OverridesPlatform-specific settings that allow you to set the resolution, file size with associated memory size requirements, pixel dimensions, and quality of your Textures for each target platform. More info
See in Glossary specific to Android. A description of the general Texture Overrides can be found here.

The information contained on this page assumes the reader has working knowledge of DXT and ETC Texture compressionA method of storing data that reduces the amount of storage space it requires. See Texture Compression, Animation Compression, Audio Compression, Build Compression.
See in Glossary, OpenGL ES, and Android development.

Further information about Texture compression3D Graphics hardware requires Textures to be compressed in specialised formats which are optimized for fast Texture sampling. More info
See in Glossary and OpenGL ES can be found on the following Wikipedia pages:

Android 2D Texture Override settings in the Textures Inspector window. Click the Android logo to access Android-specific overrides.
Android 2D Texture Override settings in the Texture’s Inspector window. Click the Android logo to access Android-specific overrides.
Texture formatA file format for handling textures during realtime rendering by 3D graphics hardware, such as a graphics card or mobile device. More info
See in Glossary		 Internal representation
RGB Compressed DXT1 Compressed RGB texture. Supported by NVIDIA Tegra. 4 bits per pixelThe smallest unit in a computer image. Pixel size depends on your screen resolution. Pixel lighting is calculated at every screen pixel. More info
See in Glossary (32 KB for a 256x256 texture).
RGB Crunched DXT1 Compressed RGB Texture. Supported by NVIDIA Tegra. Crunch is a lossy compression format on top of DXT Texture compression. Textures are decompressed to DXT1 by the CPU and then uploaded to the GPU at runtime. Crunch produces smaller Textures than by regular DXT1 compression, but with lower quality. Crunch Textures can take a long time to compress, but decompression at runtime is very fast. 4 bits per pixel (output size varies depending on the Texture - from 1 KB for a 256x256 Texture).
RGBA Compressed DXT5 Compressed RGBA texture. Supported by NVIDIA Tegra. 8 bits per pixel (64 KB for a 256x256 texture).
RGBA Crunched DXT5 Compressed RGBA Texture. Supported by NVIDIA Tegra. Crunch is a lossy compression format on top of DXT Texture compression. Textures are decompressed to DXT5 on the CPU and then uploaded to the GPU at runtime. Crunch compression can be used to produce significantly smaller Textures than by regular DXT5 compression, but with lower quality. Crunch Textures can take a long time to compress, but decompression at runtime is very fast. 8 bits per pixel (output size varies depending on the Texture - from 1 KB for a 256x256 Texture).
RGB Compressed ETC 4 bits Compressed RGB Texture. This is the default Texture format for Android projects in Unity. ETC_RGB4 is a part of OpenGL ES 2.0 and is supported by all OpenGL ES 2.0 GPUs. It does not support alpha. 4 bits per pixel (32 KB for a 256x256 Texture).
RGB Crunched ETC Compressed RGB Texture. Crunch is a lossy compression format on top of ETC Texture compression. Textures are decompressed to ETC_RGB4 by the CPU and then uploaded to the GPU at runtime. Crunch produces smaller Textures than by regular ETC_RGB4 compression, but with lower quality. Crunch Textures can take a long time to compress, but decompression at runtime is very fast. ETC_RGB4 is a part of OpenGL ES 2.0 and is supported by all OpenGL ES 2.0 GPUs. It does not support alpha. 4 bits per pixel (output size varies depending on the Texture - from 1 KB for a 256x256 Texture).
RGB Compressed ETC2 4 bits Compressed RGB Texture. ETC2 is a part of OpenGL ES 3.0 and is supported by all OpenGL ES 3.0 GPUs. 4 bits per pixel (32 KB for a 256x256 Texture).
RGB + 1-bit Alpha Compressed ETC2 4 bits Compressed RGB Texture with 1-bit punchthrough alpha. ETC2 is a part of OpenGL ES 3.0 and is supported by all OpenGL ES 3.0 GPUs. 4 bits per pixel (32 KB for a 256x256 Texture).
RGBA Compressed ETC2 8 bits Compressed RGBA Texture. Supported by all OpenGL ES 3.0 GPUs. (64 KB for a 256x256 Texture)
RGBA Crunched ETC2 Compressed RGBA Texture. Crunch is a lossy compression format on top of ETC Texture compression. Textures are decompressed to ETC2_RGBA8 on the CPU and then uploaded to the GPU at runtime. Crunch compression can be used to produce significantly smaller Textures than by regular ETC2_RGBA8 compression, but with lower quality. Crunch Textures can take a long time to compress, but decompression at runtime is very fast. Supported by all OpenGL ES 3.0 GPUs. 8 bits per pixel (output size varies depending on the Texture - from 1 KB for a 256x256 Texture).
RGB Compressed PVRTC__ 2 bits__ Compressed RGB Texture. Supported by Imagination PowerVR GPUs. 2 bits per pixel (16 KB for a 256x256 Texture)
RGBA Compressed PVRTC 2 bits Compressed RGBA Texture. Supported by Imagination PowerVR GPUs. 2 bits per pixel (16 KB for a 256x256 Texture)
RGB Compressed PVRTC 4 bits Compressed RGB Texture. Supported by Imagination PowerVR GPUs. 4 bits per pixel (32 KB for a 256x256 Texture)
RGBA Compressed PVRTC 4 bits Compressed RGBA Texture. Supported by Imagination PowerVR GPUs. 4 bits per pixel (32 KB for a 256x256 Texture)
RGB Compressed ATC__ 4 bits__ Compressed RGB Texture. Supported by Qualcomm Snapdragon. 4 bits per pixel (32 KB for a 256x256 Texture).
RGBA Compressed ATC 8 bits Compressed RGBA Texture. Supported by Qualcomm Snapdragon. 8 bits per pixel (64 KB for a 256x256 Texture).
RGB Compressed ASTC 4x4 block

RGB Compressed ASTC 5x5 block

RGB Compressed ASTC 6x6 block

RGB Compressed ASTC 8x8 block

RGB Compressed ASTC 10x10 block

RGB Compressed ASTC 12x12 block 		Compressed RGB Texture. Supported by all OpenGL ES 3.2 and OpenGL ES 3.1+AEP GPUs, as well as by some OpenGL ES 3.0 GPUs. This compression type uses fixed 128-bit block size, and depending on the pixel block size (4x4 to 12x12), it may utilize 8 to 0.89 bits per pixel. The size of the compressed Texture varies from 64 KB for a 256x256 Texture (4x4 block, highest quality) to 7.6 KB for a 256x256 Texture (12x12 block, highest compression rate).
RGBA Compressed ASTC 4x4 block

RGBA Compressed ASTC 5x5 block

RGBA Compressed ASTC 6x6 block

RGBA Compressed ASTC 8x8 block

RGBA Compressed ASTC 10x10 block

RGBA Compressed ASTC 12x12 block 		Compressed RGBA Texture. Supported by all OpenGL ES 3.2 and OpenGL ES 3.1+AEP GPUs, as well as by some OpenGL ES 3.0 GPUs. This compression type uses fixed 128-bit block size, and depending on the pixel block size (4x4 to 12x12), it may utilize 8 to 0.89 bits per pixel. The size of the compressed Texture varies from 64 KB for a 256x256 Texture (4x4 block, highest quality) to 7.6 KB for a 256x256 Texture (12x12 block, highest compression rate).
RGB 16 bit 65 thousand colors with no alpha. Uses more memory than the compressed formats, but could be more suitable for UI(User Interface) Allows a user to interact with your application. More info
See in Glossary or crisp Textures without gradients. 128 KB for a 256x256 Texture.
RGB 24 bit Truecolor but without alpha. 192 KB for a 256x256 Texture.
Alpha 8 bit High quality alpha channel but without any color. 64 KB for a 256x256 Texture.
RGBA 16 bit Low-quality truecolor. The default compression for the Textures with alpha channel. 128 KB for a 256x256 Texture.
RGBA 32 bit Truecolor with alpha - this is the highest quality compression for the Textures with alpha. 256 KB for a 256x256 Texture.
Compression quality Choose Fast for quickest performance, Best for the best image quality and Normal for a balance between the two.

If your app is installed on a device that doesn’t support the Texture compression format it uses, Unity decompresses the Textures to RGBA 32 and store them in the device’s memory, along with the compressed Textures, while the app is running. This leads to increased loading times and higher memory usage, because Unity must decompress the Textures and store two versions of the Textures used (compressed and uncompressed). This can also have a large impact on renderingThe process of drawing graphics to the screen (or to a render texture). By default, the main camera in Unity renders its view to the screen. More info
See in Glossary performance, especially on older, slower devices.

Use ETC2 compression unless your app targets specific hardware like the Nvidia Tegra. ETC2 supports Textures with and without an alpha channel, and all OpenGL ES 3 devices support it. To avoid software decompression, follow these steps:

  1. Open the Android Player settings (menu: Edit > Project SettingsA broad collection of settings which allow you to configure how Physics, Audio, Networking, Graphics, Input and many other areas of your Project behave. More info
    See in Glossary     > Player SettingsSettings that let you set various player-specific options for the final game built by Unity. More info
    See in Glossary    ).
  2. In the Other Settings section, remove OpenGL ES 2 from the Graphics APIs list. This sets the minimum graphics API to OpenGL ES 3.
  3. In the Other Settings section, set the Minimum API Level to Android 4.4 ‘KitKat’ (API level 19).

To target OpenGL ES 2 and OpenGL ES 3 devices, you can create and publish two different APKsThe Android Package format output by Unity. An APK is automatically deployed to your device when you select File > Build & Run. More info
See in Glossary. Follow these steps:

  1. Build an APK that targets OpenGL ES 3, using the Player settings in the screenshot above.
  2. Build a separate APK that targets OpenGL ES 2. To do this, remove OpenGL ES 3 and Vulkan from the Graphics APIs section of the Player settings.
  3. Publish both of these APKs to the Google Play Store. When a user downloads your app, the Google Play Store automatically installs the most relevant APK for their device.

For more information about publishing multiple APK files, see Android Developer documentation on:

When building an APK that targets OpenGL ES 2, you can use ETC1 texture compression.

The Texture compression format for OpenGL ES2-targeted APKs can be ETC1. Unity can use ETC1 for Textures with Alpha, provided they are placed on a sprite atlasA texture that is composed of several smaller textures. Also referred to as a texture atlas, image sprite, sprite sheet or packed texture. More info
See in Glossary (by specifying the packing tag) and the build is for Android. You can opt in for this by setting the Compress using ETC1 checkbox for the Texture. Unity then splits the resulting atlas into two Textures, each without alpha, and then combines them in the final parts of the render pipeline.

If you must store an alpha channel in a Texture, all hardware vendors support the RGBA 16 bit compression format.

  • 2017–09–18 Page amended

  • Updated feature in Unity 2017.1

  • Crunch compression format updated in Unity 2017.3

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