RA_T16(1) General Commands Manual RA_T16(1)NAME
ra_t16 - convert RADIANCE picture to/from Targa 16 or 24-bit image file
ra_t16 [ -2 ][ -3 ][ -g gamma ][ -e +/-stops ] [ input [ output ] ]
ra_t16 -r [ -g gamma ][ -e +/-stops ] [ input [ output ] ]
Ra_t16 converts between RADIANCE and Targa 16-bit or 24-bit RGB image files (type 2 in Targa's documentation). In the default mode, a
RADIANCE picture is converted to an RGB file of the same horizontal and vertical dimensions with 16-bits per pixel. The -3 option tells
the program to produce a 24-bit image file instead. The -g option specifies the exponent used in gamma correction; the default value is
2.2. An exponent of 1.0 turns gamma correction off. 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 16-bit or 24-bit Targa file to a RADIANCE
picture. The determination of depth is made automatically on reverse translation, so the -2 and -3 options are not necessary. If the out-
put file is missing, the standard output is used.
Run-length encoded files can be read but not written with this program.
SEE ALSO pfilt(1), ra_bmp(1), ra_bn(1), ra_ppm(1), ra_pr(1), ra_pr24(1), ra_t8(1), ra_tiff(1), ximage(1)RADIANCE 11/15/93 RA_T16(1)
Check Out this Related Man Page
RA_BMP(1) General Commands Manual RA_BMP(1)NAME
ra_bmp - convert RADIANCE picture to/from Windows BMP image
ra_bmp [ -b ][ -g gamma ][ -e spec ][ -p xr yr xg yg xb yb xw yw ] [ [ input|- [ output ] ]
ra_bmp -r [ -g gamma ][ -e +/-stops ] [ [ input|- [ output ] ]
Ra_bmp converts between RADIANCE and a Windows BMP image. During forward conversion, the -b option produces 8-bit grayscale output rather
than 24-bit RGB. The -g option specifies the exponent used in monitor gamma correction; the default value is 2.2. The -e option specifies
a tone-mapping method or exposure compensation. If the argument is one of the special words "auto", "human", or "linear", the image will
be tone-mapped with histogram adjustment, human vision simulation, or an averaged linear exposure, respectively. (These words may be
abbreviated by one or more letters.) Otherwise, the exposure specification is interpreted as a linear compensation value in integer f-
stops, which must be proceeded by a '+' or '-'. The CRT color output primaries may be specified with the -p option.
The -r option invokes a reverse conversion, from a Windows BMP image to a RADIANCE picture. Tone-mapping and monitor primaries are not
supported for reverse conversion.
Ra_bmp can accept 16-bit or color-mapped BMP files on input, but cannot not produce them on output.
A hyphen ('-') may be specified to indicate standard input for either forward or reverse conversion so that an output file may be speci-
fied. If the BMP input is taken from the standard input or sent to the standard output without tone-mapping, then the scanlines may be
reversed from their usual ordering. Reversed scanlines sometimes causes difficulties for programs attempting to interpret the resulting
RADIANCE picture or BMP image, which may be rejected or displayed inverted.
SEE ALSO pfilt(1), ra_ppm(1), ra_pr(1), ra_pr24(1), ra_t8(1), ra_t16(1), ra_tiff(1), ximage(1)RADIANCE 3/25/04 RA_BMP(1)
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