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The Bitmap node can be used to load high dynamic range images (HDRI) or other file formats. Once you attach your desired file, its name is displayed above the node.

UI Path: ||V-Ray Node Editor|| > Shader > Add > Textures > V-Ray Bitmap

Image Added

Open Image – Specifies the file name, 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. Once a file is added, you are allowed to save the data or to unlink the data (Image Added).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

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

Nearest – The nearest texel from the map is taken without any interpolation. 
No filtering – No filter is applied.
Mip-map filtering – Applies a Mip-map filter.
Summed are table filtering – Pyramidal Mip-map filtering is used to compute the texture color. Can be blurry for textures seen at grazing angles. 
Elliptical filtering – High-quality anisotropic MIP-map texture filtering that reduces blurring and aliasing artifacts.
Sharp mip-map filtering – Sharper but slower method in comparison to the Mip-map.

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

Nearest – The nearest texel from the map is taken without any interpolation. 
No Filter – No filter is applied.
Mip-map – Applies a Mip-map filter.
Area – Applies an anti-aliasing area filter.
Elliptical – High-quality anisotropic MIP-map texture filtering that reduces blurring and aliasing artifacts.
Sharp mip-map – Sharper, but slower method in comparison to the Mip-map3dsMax auto – Interpolation type is chosen automatically, depending on the bitmap format to match the behavior of the standard texture. For HDR and EXR images, the interpolation is Bilinear, and for all other formats - Bicubic.

Filter Blur – Additional multiplier which that 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.Use Input Gamma – .

Transfer Function – Specifies the color space for the loaded image file. You can manually modify the value.

Linear – No correction is applied.
Gamma corrected  – The color space is controlled through the Gamma parameter.
sRGB  – The loaded image is considered in sRGB color space.
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 others), 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.

Color Space – Allows manual overriding of the RGB primaries of the bitmap.

Raw – No transformation is applied to R|G|B colors. This option is suitable for normal maps.
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.

Use Data Window – 

Image RemovedImage Added

Color Mult – Specifies a multiplier for the imported image file.

Color Offset –  Adjusts the correction of color offset RGB.

Invert Color – Inverts the colors of the Bitmap.