Radiance 3.9 (Stable branch)


 
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Old 07-08-2008
Radiance 3.9 (Stable branch)

Radiance is a set of tools which provide an advanced lightingsimulation software package. It allows very detailed definition ofmaterials' and light sources' properties through the use of advancedtechniques like brdf and ies files, as well as a powerful mathematicalscripting language, resulting in accurate renderings of scenes whichare usually imported from CAD and 3D modelers. It uses the hybridapproach of Monte Carlo and deterministic ray tracing to achieve areasonably accurate result in a reasonable time.License: Free To Use But RestrictedChanges:
Memory requirements for octree were reduced by a factor of 8. Byte-swapping input and output was added to rcalc along with extra error checking for source surfaces, a -spec option in falsecolor to restore the original spectral color scale, the ability to incorporate BSDF data in calculations, and support for persistent rendering and for cumulative calculations. Ray weights were corrected for material mixtures. Bugs in the shadow cache were fixed. Pixel alignment was fixed in pcomb for size reduction and enlargement.Image

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RA_TIFF(1)						      General Commands Manual							RA_TIFF(1)

NAME
ra_tiff - convert RADIANCE picture to/from a TIFF color or greyscale image SYNOPSIS
ra_tiff [ -z|-L|-l|-f|-w ][ -b ][ -e +/-stops ][ -g gamma ] { in.hdr|- } out.tif ra_tiff -r [ -x ][ -g gamma ][ -e +/-stops ] in.tif [ out.hdr|- ] DESCRIPTION
Ra_tiff converts between RADIANCE and TIFF image formats. The -g option specifies the exponent used in gamma correction; the default value is 2.2, which is the recommended value for TIFF images. The -b option can be used to specify an 8-bit greyscale TIFF output file. The type of input file is determined automatically. The -z option will result in LZW compression of the TIFF output file. The -L option specifies SGILOG compression, which is recommended to capture the full dynamic range of the Radiance picture. However, since many TIFF readers do not yet support this format, use this option under advisement. The -l option specifies SGILOG24 compressed output, which has less dynamic range than SGILOG, but may be smaller in some cases. (It is usually larger.) The -f option specifies 32-bit IEEE floating-point/primary output, which is the highest resolution format but results in very large files, since each RGB pixel takes 96 bits (12 bytes) and does not compress well. The -w option specifies 16-bit/primary output, which is understood by some photo editing software, such as Adobe Photoshop. Decompression is automatically deter- mined for TIFF input. The -e option specifies an exposure compensation in f-stops (powers of two). Only integer stops are allowed, for efficiency. The -r option invokes a reverse conversion, from a TIFF image to a RADIANCE picture. The RADIANCE picture file can be taken from the stan- dard input or sent to the standard output by using a hyphen ('-') in place of the file name, but the TIFF image must be to or from a file. The -x option can be used to specify an XYZE Radiance output file, rather than the default RGBE. EXAMPLES
To convert a Radiance picture to SGILOG-compressed TIFF format: ra_tiff -L scene1.hdr scene1.tif To later convert this image back into Radiance and display using human visibility tone-mapping: ra_tiff -r scene1.tif scene1.hdr ximage -e human scene1.hdr AUTHOR
Greg Ward Larson Sam Leffler ACKNOWLEDGEMENT
Work on this program was initiated and sponsored by the LESO group at EPFL in Switzerland. Additions for the SGILOG data encoding were sponsored by Silicon Graphics, Inc. BUGS
Many TIFF file subtypes are not supported. A gamma value other than 2.2 is not properly recorded or understood if recorded in the TIFF file. SEE ALSO
pfilt(1), ra_bmp(1), ra_bn(1), ra_ppm(1), ra_pr(1), ra_pr24(1), ra_t8(1), ra_t16(1), ximage(1) RADIANCE
8/29/97 RA_TIFF(1)