The Texture Editor allows you to preview Texture assets and or modify their properties. From the Texture Editor you can do a wide range of items like apply color adjustments, modify compression and adjust the Textures LOD settings from here.
For more information about the Texture Editor UI, see Texture Editor UI.
Opening the Texture Editor
The Texture Editor is usually summoned from the Content Browser by double-clicking on a Texture asset.
Details Panel
The Details panel displays the Texture asset's properties, and allows you to modify them.
At the top of the Details panel, you can see information about how the Texture is currently being displayed, statistics about the Texture such as size and compression method, and platform-specific settings for the Texture.
Compression
| Item | Description |
|---|---|
| Compress Without Alpha | If enabled, the Textures Alpha channel will be discarded during compression. |
| Defer Compression | If enabled, defer compression of the Texture until save. |
| Compression Settings | The compression settings to use when building the Texture. |
| Maximum Texture Size | The maximum resolution for generated textures. A value of 0 means the maximum size for the format on each platform, except HDR long/lat cubemaps, which default to a resolution of 512. |
| Compression Quality | The compression quality for generated textures. |
Level Of Detail
The Level Of Detail section displays mip and LOD settings.
Mip-map generation happens during importing of the Texture and creates a mip-map chain for the Texture. The mip-map chain consists of multiple levels of the sample image, each half the resolution of the level before. That data allows the graphic card to render faster when using the lower mips (less memory bandwidth) and also reduces the Texture aliasing (shimmering) that becomes visible when having detailed Texture in certain distances. The setting has no performance impact at runtime as it only affects the mip-map generation (during importing or when changing the setting).
In the Mip Gen Settings drop-down box, the SimpleAverage setting uses a 2x2 kernel size, and all Sharpen settings use a 8x8 kernel and some negative weights to sharpen. Sharpen0 is not sharpening, but it still uses the quality down-sampling filter all Sharpen settings use (4x4 Gaussian kernel). Compared to SimpleAverage, it appears blurrier but higher quality.
When you are using color content, the sharpening is not processing the color channels independently. Then luminance is done as defined and the chrominance (color) information is down-sampled without sharpening (currently 2x2 but 4x4 Gaussian would be possible as well). This avoids a color shift in some extreme cases. Sharpening also helps to improve the DXT compressor as the compression of subtle color shades is limited.
| Item | Description |
|---|---|
| Mip Gen Settings | This option allows you to customize how the content of the mip-map chain looks. Note that the usage of mip-maps can reduce Texture details. In order to counteract the blurring the mip-mapping introduces, it is possible to sharpen the image during down-sampling to restore some of the information loss. Using a limited amount of sharpening (values up to 4 or 5) can help to increase the image quality without performance loss or memory cost. Using strong sharpening (values bigger than 6) can result in dark or bright borders around the image content, but this might be acceptable in certain situations (depending of art style and Texture content). |
| LOD Bias | The number of miplevels to drop before uploading the Texture. This value can be negative to compensate for the LODGroup's LOD bias for a particular Texture. The LODBias, the LODGroup's LOD bias and the NumCinematicMipLevels are all added together to form a final LOD bias value for the Texture. Mip-levels that cannot be reached in-game because of its LOD bias are removed from the cooked data on disk by Unreal Frontend to save disk space. |
| Texture Group | The Texture group this Texture belongs to for LOD bias. |
| Global Force Resident Mip Levels | Global and serialized version of ForceMiplevelsToBeResident. |
| Preserve Border | When true, the Texture's border will be preserved during mipmap generation. |
| Num Cinematic Mip Levels | Specifies how many of the highest-resolution mip levels should be reserved for cinematic usage - when the Texture is forcibly streamed in with cinematic quality. While the game is running normally, this property behaves just like a regular LOD bias: A value of 1 reduces the Texture's in-game resolution by one mip-level. However, when the corresponding Texture group is set to cinematic quality, the cinematic high-resolution mip levels are streamed in. |
It is a good idea to have have some mip sharpening (for example, Sharpen4) defined for all color Textures. Normal maps or other Textures not storing colors might also get more detail on the first sight, but it actually might get worse (e.g. distorted surface normals, aliasing speculars).
Texture
The Texture section displays information about the Texture asset's source file, and some additional settings.
| Item | Description |
|---|---|
| Power of Two Mode | Drop-down for how to pad the texture to a power of 2 size (if necessary). |
| Padding Color | The color used to pad the texture out if it is resized due to Power of Two Mode. |
| sRGB | Sets whether the Texture should be gamma (un)corrected or not. Regular diffuse Textures and basically anything you use for display as color values should have this set to true. It is usually disabled for cases where the Texture color values have a specific meaning and you rely on those values to be that way as they were set, e.g. via code. Normal maps should have this set to false as their color values are to be interpreted as a direction and thus should not be gamma corrected. |
| X-axis Tiling Method | Sets the addressing mode of the Texture's X axis. |
| Y-Axis Tiling Method | Sets the addressing mode of the Texture's Y axis. |
| Dither Mip Map Alpha | When true, the alpha channel of mipmaps and the base image are dithered for smooth LOD transitions. |
| Flip Green Channel | When true, the Texture's green channel will be inverted. This is useful for some normal maps. |
| Alpha Coverage Thresholds | Alpha values per channel to compare to when preserving alpha coverage. |
| Filter | The Texture filtering mode to use when sampling this Texture. |
| Use Legacy Gama | The Texture filtering mode to use when sampling this Texture. |
| Never Stream | If True, the Texture will never be streamed out of memory. |
| Asset User Data | Array of user data stored with the asset. |
File Path
The File Path option shows the location, date and time that this Texture was imported into your UE4 project.
| Item | Description |
|---|---|
| Source File | The path that this Texture was imported from. |
Adjustments
The options in the Adjustments section allow you to adjust the Texture's color without modifying the actual source art. These changes are applied at compression-time.
| Item | Description |
|---|---|
| Brightness | Scales the brightness of the Texture by multiplying the HSV Value component by the number specified. Values greater than 1.0 increase the brightness of the image, while values less than 1.0 will decrease the image brightness. You can enter whatever number you want, but the final V value will be clamped between 0.0 and 1.0 (per pixel.) The default for this setting is 1.0. |
| Brightness Curve | Modifies the brightness of the Texture using a curve. Each pixel has its HSV Value component raised to the power specified. This scales the image brightness non-linearly using a curve defined by the power function. Values less than 1.0 increase the brightness of the image, while values greater than 1.0 decrease the image brightness. You can enter whatever number you want, but the final V value will be clamped between 0.0 and 1.0 (per pixel.) The default for this setting is 1.0. |
| Vibrance | Adjusts the Texture's saturation using a number between 0.0 and 1.0. This applies a custom algorithm that attempts to increase the saturation of colors that are naturally less saturated. This is useful when you want to bring the less-saturated parts of a Texture up to match the other already-saturated pixels. The default for this setting is 0.0. |
| Saturation | Scales the Texture's color saturation by multiplying the HSV Saturation component by the number specified. Values greater than 1.0 increase the saturation, while values less than 1.0 decrease the image saturation. A value of zero will result in a fully greyscale image. You can enter whatever number you want, but the final S value will be clamped between 0.0 and 1.0 (per pixel.) The default for this setting is 1.0. |
| RGBCurve | Modifies the brightness of the Texture using a curve. Each pixel has its linear-space RGB values raised to the power specified. This scales the image brightness non-linearly using curve defined by the power function. Values less than 1.0 increase the brightness of the image, while values greater than 1.0 will decrease the image brightness. You can enter whatever number you want, but the final value will be clamped between 0.0 and 1.0 (per pixel.) The default for this setting is 1.0. |
| Hue | Modifies the image hue by shifting the HSV Hue component along the color circle by the specified number of degrees (0.0 - 360.0). Very small numbers will slightly tint the color of your image, while large numbers may change the color radically. If you use a number outside of the 0.0 - 360.0 range, then the hue will "wrap" to a number within that range. The default for this setting is 0.0. |
| Min Alpha | Sets the minimum value for the range the Texture gets "unpacked" to. The default is 0. Note that normal maps require the min/max range to be -1 to 1, and this is set automatically if you choose the proper compression setting. |
| Max Alpha | Sets the maximum value for the range the Texture gets "unpacked" to. The default is 1. You can set the Max Alpha to a higher value if you want overbrightening via the Texture. |
| Chroma Key Texture | If true, the chroma key image, replacing any pixels that match Chroma Key Color with transparent black. |
| Chroma Key Threshold | The threshold that components have to match for the texel to be considered equal to the Chroma Key Color when chroma keying (<=, set to 0 to require a perfect exact match). |
| Chroma Key Color | The color that will be replaced with transparent black if chroma keying is enabled. |
Compositing
The Compositing section controls how this texture will be used to modify the Roughness map.
| Item | Description |
|---|---|
| Composite Texture | The Texture asset used to modify the roughness based on the normal map variation (mostly from mip maps). Make sure the normal map has at least as many mips as this Texture asset. |
| Composite Texture Mode | Defines how the Composite Texture is applied. |
| Composite Power | Sets the strength of the effect of the Composite Texture. Higher values result in a stronger effect. The default is one. |