Search Keywords: OpenEXR, converter, high-dynamic range, HDR, HDRI

General

This is tool that can be used to convert a variety of image files to tiled multiresolution .exr files in OpenEXR format. The resulting tiled OpenEXR textures can be used in V-Ray for 3ds Max through the VRayHDRI texture, or directly in V-Ray for Maya and V-Ray Standalone.

 

Supported input image formats are:

- V-Ray image file (*.vrimg)

- Portable Network Graphics (*.png)

- Windows bitmap (*.bmp)

- Targa image file (*.tga)

- Radiance HDR image (*.hdr)

- Silicon Graphics (*.sgi, *.rgb, *.rgba)

- JPEG image file (*.jpg, *.jpeg, *.jpe)

- OpenEXR image file (*.exr)

- Softimage PICT file (*.pic)

- Tagged image file format (*.tif, *.tiff)

- Photoshop (*.psd)

Usage

There are several methods for running the img2tiledexr converter:

 

 

In all cases, the original image files are not deleted.

Postfix "_tiled" will be added to the file name in case you use wildcards.

 

Note that many applications expect the colors in OpenEXR files to be in linear color space rather than sRGB/gamma 2.2 color space.. For this reason, img2tiledexr automatically converts the colors in the input image from sRGB to linear space for all image file formats except .hdr and .exr images. You can use the -linear option to control this converson.

Options

One or more of the following options may be specified:

 

Option Description
-32bit Stores the floating-point data in the .exr file as 32-bit floating point numbers. If this option is not specified, the data is stored as 16-bit floating point numbers.
-compression <method> Sets the compression type for the resulting .exr file. If not specified, ZIP compression is used. Currently supported values for <method> are: none, rle, zips, zip, piz, pxr24
-tileSize <size> Set in <size> the dimension of a square tile. If not specified, the default tile size is 64x64.
-linear <mode> Specifies if the input image should be converted from sRGB to linear color space when saved into the tiled OpenEXR file. Possible values are: off (no conversion), on (convert colors from sRGB to linear space), auto (convert all images except .hdr and .exr files).
-subdirs  When using wildcard, this option makes img2tiledexr to search the subdirectories of the specified one.
-help  Print the help massage