Bitmap

This page provides details about the Bitmap texture in Chaos Vantage.

Overview

The Bitmap texture has a versatile use. It allows a bitmap image to be loaded as a texture. It can also load other file types, such as high dynamic range files and movie files, but with some limitations.

The Bitmap texture parameters are grouped into several tabs: Bitmap, Common and Mapping Properties, UVW Coordinates, and UVW Randomizer.

Bitmap

File – Specifies the file from which the bitmap is loaded. The field can contain <UDIM> or <UVTILE> tags from Mari or Mudbox tiles, respectively, or $nU and $nV from explicit tiles.

Transfer function – Specifies the transfer function for the loaded image file.

Linear –
sRGB – The loaded image is considered in sRGB transfer function.
Gamma corrected – The transfer function is controlled through the Gamma parameter.
Auto – Automatically determines the color transfer function. If a bitmap file name contains the string "_srgb", the transfer function is sRGB. If a bitmap file name contains the strings "_lin_srgb" or "raw", no correction is applied. For bitmap files with 8 bits per color component and 3 or 4 color components (like png, jpg and other), the transfer function is sRGB. In all other cases, no correction is applied.

RGB color space – Specifies the linear RGB color space of the texture. The default property is "raw". Texture will be converted from this color space to the renderer color space. Built-in supported linear color spaces are "raw" for no conversion, "lin_srgb" for sRGB, and "acescg" for ACEScg. If the OCIO environment variable is set or if the SettingsUnitsInfo "ocio_config_file" parameter is set, the value can be any color space available in the OCIO config. This conversion is applied after the transfer function. The parameter transfer_function must be set, or else texture filtering will not work correctly.

Gamma – Specifies the gamma curve correction applied when the Transfer Function is set to Gamma corrected.

Allow negative colors – When disabled, negative colors are clamped.

Frame offset – Starts frame offset for image sequences.

For information about the parameters in the Common and Mapping Properties, UVW Coordinates, and UVW Randomize tabs, see the Textures page.