Options

Settings

In the Settings panel you can define which source file to use.

Image
The Image Data-Block Menu. For the options see Image Settings.

Alpha

Alpha

Options related to transparency.

Use
Use the alpha channel information stored in the image. Where the alpha value in the image is less than 1.0, the object will be partially transparent and things behind it will be visible. Works with files like PNG and TGA that can save transparency information. The Use Alpha in the Settings panel must be enabled.
Calculate

Calculate an alpha based on the RGB values of the Image. Black (0, 0, 0) is transparent, white (1, 1, 1) opaque. Enable this option if the image texture is a mask. Note that mask images can use shades of gray that translate to semi-transparency, like ghosts, flames, and smoke/fog.

The image with various alpha and gray-scale values.
../../../../../../_images/render_blender-render_textures_types_image_options_alpha-use.png

Image with Use alpha. The alpha values of the pixels are evaluated.

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Image with Calculate alpha only, Use Alpha in the Image panel is disabled.

Invert
Reverses the alpha value. Use this option if the mask image has white where you want it transparent and vice versa.

Mapping

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Image Mapping panel.

In the Mapping panel, you can control how the image is mapped or projected onto the 3D model.

Flip X/Y Axis
Rotates the image 90 degrees counterclockwise when rendered.
Extension
Extend
Outside the image the colors of the edges are extended.
Clip
Clip to image size and set exterior pixels as transparent. Outside the image, an alpha value of 0.0 is returned. This allows you to ‘paste’ a small logo on a large object.
Clip Cube
Clips to cubic-shaped area around the images and sets exterior pixels as transparent. The same as Clip, but now the ‘Z’ coordinate is calculated as well. An alpha value of 0.0 is returned outside a cube-shaped area around the image.
Repeat

The image is repeated horizontally and vertically.

Repeat
X/Y repetition multiplier.
Mirror
Mirror on X/Y axes. These buttons allow you to map the texture as a mirror, or automatic flip of the image, in the corresponding X and/or Y direction.
Checker

Checkerboards quickly made. You can use the option size on the Mapping panel as well to create the desired number of checkers.

Even/Odd
Set even/odd tiles.
Distance
Governs the distance between the checkers in parts of the texture size.
Crop Minimum / Crop Maximum
The offset and the size of the texture in relation to the texture space. Pixels outside this space are ignored. Use these to crop, or choose a portion of a larger image to use as the texture.

Sampling

In the Sampling panel you can control how the information is retrieved from the image.

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Image Sampling panel.

Interpolation

This option interpolates the pixels of an image. This becomes visible when you enlarge the picture. By default, this option is on. Turn this option off to keep the individual pixels visible and if they are correctly anti-aliased. This last feature is useful for regular patterns, such as lines and tiles; they remain ‘sharp’ even when enlarged considerably. Turn this image off if you are using digital photos to preserve crispness.

../../../../../../_images/render_blender-render_textures_types_image_options_interpolation-off.png

Enlarged Image texture without Interpolation.

../../../../../../_images/render_blender-render_textures_types_image_options_interpolation-on.png

Enlarged Image texture with Interpolation.

MIP Map

Mip-maps are precalculated, smaller, filtered textures for a certain size. A series of pictures is generated, each half the size of the former one. This optimizes the filtering process. By default, this option is enabled and speeds up rendering. When this option is OFF, you generally get a sharper image, but this can significantly increase calculation time if the filter dimension (see below) becomes large. Without mip-maps you may get varying pictures from slightly different camera angles, when the textures become very small. This would be noticeable in an animation.

MIP Map Gaussian filter
Used in conjunction with mip-mapping, it enables the mip-map to be made smaller based on color similarities. In game engines, you want your textures, especially your mip-map textures, to be as small as possible to increase rendering speed and frame rate.
Filter

The filter size used in rendering, and also by the options Mip Map and Interpolation. If you notice gray lines or outlines around the textured object, particularly where the image is transparent, turn this value down from 1.0 to 0.1 or so.

Texture Filter Type

Texture filter to use for image sampling. Just like a pixel represents a pic ture el ement, a texel represents a tex ture el ement. When a texture (2D texture space) is mapped onto a 3D model (3D model space), different algorithms can be used to compute a value for each pixel based on samples from several texels.

Box
A fast and simple nearest-neighbor interpolation known as Monte Carlo integration.
EWA (Elliptical Weighted Average)

One of the most efficient direct convolution algorithms developed by Paul Heckbert and Ned Greene in the 1980s. For each texel, EWA samples, weights, and accumulates texels within an elliptical footprint and then divides the result by the sum of the weights.

Eccentricity
Maximum Eccentricity. Higher values give less blur at distant/oblique angles, but is slower.
FELINE (Fast Elliptical Lines)

Uses several isotropic probes at several points along a line in texture space to produce an anisotropic filter to reduce aliasing artifacts without considerably increasing rendering time.

Probes
Number of probes to use. An integer between 1 and 256. Further reading: McCormack, J; Farkas, KI; Perry, R; Jouppi, NP (1999) Simple and Table Feline: Fast Elliptical Lines for Anisotropic Texture Mapping, WRL
Area

Area filter to use for image sampling.

Eccentricity
Maximum Eccentricity. Higher values give less blur at distant/oblique angles, but is slower.
Filter Size
The filter size used by MIP Map and Interpolation.
Minimum Filter Size
Use Filter Size as a minimal filter value in pixels.