Gradients, i.e. false color maps, reside in directory gradients, they are identified by GwyGradient and contain only data. They can be edited in the application using the gradient editor.

The gradient data consists of rows corresponding to individual points in the gradient:

position red green blue alpha

The position determines where the color defined by red, green, blue and alpha components is placed in the interval [0, 1] where 0 corresponds to the gradient start, 1 corresponds to the end. The color is interpolated linearly between the specified points.

The positions must form an increasing sequence from 0 to 1 (i.e. the minimum number of color points is two). The range of the color components is also [0, 1]. Note the alpha value, corresponding to opacity, is unused and must be given as 1 (fully opaque).

For instance, the standard gradient Red going from black (0 0 0) to red (1 0 0) to white (1 1 1) is defined as follows:

Gwyddion resource GwyGradient
0.0 0 0 0 1
0.5 1 0 0 1
1.0 1 1 1 1

OpenGL materials reside in directory glmaterials, they are identified by GwyGLMaterial and contain only data. They can be edited in the application using the OpenGL material editor.

The material data consists of four RGBA lines, similar to gradients that correspond in to the four OpenGL material components in the following order:

See section OpenGL Material Editor for explanation of the components. They are followed by a line containing the shininess, again as a number from the interval [0, 1].

Note the emission component, while read and written by Gwyddion, is presently unused by the 3D view. It is recommended to set it to 0 0 0 1, i.e. black.

For instance, the standard material Red-Rubber with very dark red ambient color, grayish diffuse reflection, red specular reflection and low shininess is defined as follows:

Gwyddion resource GwyGLMaterial
0.05 0.0  0.0  1.0
0.5  0.4  0.4  1.0
0.7  0.04 0.04 1.0
0.0  0.0  0.0  1.0
.078125

Grain values reside in directory grainvalues, they are identified by GwyGrainValue and contain only named parameters. They can be used to define additional grain quantities, derived from the built-in quantities, that appear under User group in grain analysis functions. At the time of writing this, there is no editor in the application, new quantities must be created manually.

The named parameters are summarized in the following table:

At present, user-defined grain quantities cannot depend on other user-defined grain quantities to avoid circular dependencies. The built-in grain quantities are listed below:

For instance, a new grain value Height, measuring the grain height as the difference between the maximum and minimum value, can be defined as follows:

Gwyddion resource GwyGrainValue
symbol dz
symbol_markup Δz
power_xy 0
power_z 1
expression z_max - z_min

Raw file presents reside in directory rawfile, they are identified by GwyRawFilePreset and contain only named parameters. They are normally created and edited by the preset editor in the raw file import module.

The named parameters in the resource files correspond closely to the parameters in the user interface explained in detail in section Raw Data File Import. Hence, they will be described only briefly here.

Note the choice of a built-in binary format, i.e. nonzero builtin, implies the binary format to some extent. This means the options size, revbyte and sign are ignored as they are used only for detailed specification of user formats. The available formats are listed in the following table: