radiance-experttools(1) [debian man page]
RADIANCE-EXPERTTOOLS(1) General Commands Manual RADIANCE-EXPERTTOOLS(1) NAME
radiance-experttools -- Specialty programs of the Radiance package, used by experts DESCRIPTION
This manual page documents briefly the debugcal, genambpos, genrhgrid, glaze, mgf2inv, mgfilt, nff2rad, objpict, optics2rad, pcwarp, pdelta, pgblur, plot4, ra_hexbit, ra_pfm, rlux, vinfo and xyzimage commands. These specialty programs of the Radiance package are commonly only used by experts, therefore the Radiance distribution does not contain full manpages for them. debugcal debugcal is a script to debug cal files for Radiance Takes octree and rcalc options as arguments. One of the rcalc options should be -f calfile. Note that the real arguments A1, A2, etc must also be given. Input is a ray origin and direction, such as that produced by ximage. genambpos genambpos is a script which puts coloured markers (spheres) at points where hemispherical sampling was initiated. The locations and levels are taken from the binary ambient file. genrhgrid genrhgrid is a program to generate Radiance section grid representations glaze Complex glazing model (goes with glaze1.cal and glaze2.cal) mgf2inv mgf2inv is a translator from MGF to Inventor (or VRML) format mgfilt mgfilt is a filter for MGF nff2rad nff2rad converts Neutral File Format input to Radiance scene descriptions. objpict objpict makes a nice multi-view picture of an object. Command line arguments contain materials and object files. optics2rad optics2rad converts Optics 5 output to correct Radiance input. pbilat Bilateral Filter. pcwarp Intended as more general substitute for macbetcal, but never quite worked. pdelta pdelta computes 1976 CIE Lab deltaE* between two Radiance pictures. pgblur pgblur applies Gaussian blur without resizing the image. More efficient than straight pfilt for large blurs. plot4 plot4 is a program to put four metafile pages onto one. ra_hexbit ra_hexbit is a program to generate bitmap files for use with hexbit4x1.fnt. ra_pfm ra_pfm is a program to convert to/from Poskanzer Float Map image format using pvalue. rlux rlux computes illuminance from ray origin and direction. vinfo vinfo is a wrapper around vim to edit information header in Radiance files. xyzimage xyzimage is a program to display one or more CIE XYZE pictures using ximage. AUTHOR
This manual page was written by Bernd Zeimetz <bernd@bzed.de> for the Debian system (but may be used by others). Permission is granted to copy, distribute and/or modify this document under the terms of the Radiance Software License, Version 1.0. RADIANCE-EXPERTTOOLS(1)
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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)