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The V-Ray Bitmap can be used to load high dynamic range images (HDRI) and map them onto the environment. V-Ray supports most of the standard HDRI-environment mapping methods. This texture can also be used to load other file formats. 

UI Path: Texture > V-Ray > VRayBitmap

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Bitmap – Specifies the name of the file, from which the bitmap is loaded. Currently supported formats are HDR, EXR, PNG, BMP, TGA, SGI, JPG, PIC, TIF, PSD, VRIMG. Image file lists in the form of IFL files are also supported.

UV Tiling Mode – Specifies the type of UV tiling used by the texture. You can also do this manually, see the Tags for Multi-Tiles section. In brackets are examples of texturing tools that support the mode.

Off – Disables UV tiling.
0-based (ZBrush) – The UV coordinates start at 0.
1-based (Mudbox) – The UV coordinates start at 1.
UDIM (Mari) – Uses UDIM tiling for the texture.

Filter – Specifies the V-Ray internal texture filtering method. Possible values are:

No Filter
Mip-map – Pyramidal MIP map filtering is used to compute the texture color. Can be blurry for textures seen at grazing angles. 
Area
Elliptical – High-quality anisotropic MIP map texture filtering that reduces blurring and aliasing artifacts. Can be slower, compared to the Isotropic filtering. 
Sharp Mip-map – Sharper and more accurate version of the Mip-map filtering. Produces results that are closer to the results with disabled filtering but with less AA samples are required.

Interpolation – Determines how the image is interpolated from the pixel values. Possible values are:

Bilinear – Image values are interpolated from four pixels in the bitmap. This is the fastest interpolation method, but the result is not continuous (non-smooth) and may produce artifacts when the map is used for displacement or bump mapping.
Bicubic – Image values are interpolated from sixteen pixels in the bitmap. This is the slowest method, but the results are smooth without too much blur.
Biquadratic – Image values are interpolated from nine pixels in the bitmap. This method is faster than the Bicubic interpolation, but may smooth the image too much. 

Filter Blur – Additional multiplier, which controls filter blurring, especially useful with the mapping source feature. The higher the value, the more blurred the texture renders and the less render time it takes, and vice versa. A value of 0.01 means no filtering, but leads to increased render times. If a Bitmap is connected to the VRayBitmap as a mapping source, the Filter option serves as a multiplier for the Blur parameter of the Bitmap. For example, if the Bitmap Blur parameter is set to 10, and the VRayBitmap Filter multiplier is set to 0.1, the texture's blur amount is effectively, 1. 

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

Linear – No correction is applied.
Gamma corrected – The transfer function is controlled through the Gamma parameter.
sRGB – The loaded image is considered in sRGB transfer function;
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.

Gamma – A gamma–correction value for the image. For example, if the bitmap was saved to disk with a 2.2 gamma correction, you need to enter 0.4545 to remove that correction for the rendering.

RGB Primaries – Allows you to manually override the RGB primaries of the VRayBitmap.

Raw – No transformation is applied to R|G|B colors. This option is suitable for normal maps, linear textures and floating value parameters.
sRGB – The loaded image is considered in sRGB color space.
ACEScg – The loaded image is considered in ACEScg color space.

Allow Negative Colors – If disabled, negative colors are clamped. Enable to allow negative colors.

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Tile – Specifies how the texture is repeated:

No tiling – No repetition is done;
Tile in UV – Repeats the texture in both U and V axis;
Tile in U – Repeats the texture only on the U axis;
Tile in V – Repeats the texture only on the V axis;
Tile in UV - No Filter

Placement Type – Specifies how the mapping controls below work:

Full – Uses the whole bitmap.
Crop – Uses a section of the bitmap.
Place – Adjusts, according to the position of the image.

Tile U/V – Adjust the tiling along the U and V axis.

U/V – Adjusts the texture location - specifies the location of the top left corner of the image.

Width/Height – Adjusts the width and height of the texture or crop area.

Jitter – Introduces random offset.