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- XIMAGE(1) USER COMMANDS XIMAGE(1)
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- NAME
- ximage - RADIANCE driver for X window system
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- SYNOPSIS
- ximage [ =geometry ][ -c ncolors ][ -d ][ -b ][ -m ][ -g
- gamma ][ -f ][ -e +/-stops ] pixfile
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- DESCRIPTION
- Ximage takes the RADIANCE picture file pixfile and displays
- it on an X window server. The -c option specifies the
- number of colors to use (default fills color table). The -d
- option turns off color dithering. The -b option displays
- the image in black and white (greyscale). The -m option
- forces monochrome output. The -g option specifies the
- exponent used in gamma correction; the default value is 2.0.
- The -f option stores a Pixmap on the server side for faster
- refresh. This may not work with large images on some
- servers. The -e option specifies an exposure compensation
- in f-stops (powers of two). Only integer stops are allowed,
- for efficiency.
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- If no pixfile is given, input is read from stdin provided
- either the -b or -m option is in effect. However, many of
- the commands given below will not work.
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- COMMANDS
- Once a picture is displayed, the user may perform a number
- of operations. Some of the operations make use of an area
- of interest, defined by pressing a mouse button and dragging
- the cursor over a section of the image. Pressing a button
- and immediately releasing it defines a single point as the
- area of interest. A command is a single character.
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- q Quit program.
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- <space> Redraw the area of interest.
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- ^R Redraw the entire image.
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- <return> Display the radiance averaged over the area of
- interest.
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- l Display the luminance value in the area of
- interest.
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- c Display the color in the area of interest.
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- p Display the x and y location of the cursor.
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- i Identify identical pixels by assigning a random
- color at the cursor position. This is useful for
- displaying contours, especially when combined with
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- Sun Release 4.1 Last change: 1
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- XIMAGE(1) USER COMMANDS XIMAGE(1)
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- the -b option.
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- t Print the ray origin and direction for the given
- cursor location. This can be used as input to
- rtrace(1) to get additional information about the
- image (ie. pipe the output of ximage into rtrace).
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- = Adjust the exposure to the area of interest. A
- crude adjustment is made immediately, and the
- number of stops is printed while the colors are
- resampled. After a few seconds to a minute, the
- final image is redisplayed. If the area of
- interest is already within 1 stop of the ideal,
- the bell is sounded and no adjustment is made.
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- In addition to the commands listed above, the control or
- shift key may be held while the cursor is dragged to reposi-
- tion the image within the window.
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- AUTHORS
- Greg Ward
- Paul Heckbert provided the code for color quantization
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- SEE ALSO
- aedimage(1), pfilt(1), rpict(1), rtrace(1)
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- Sun Release 4.1 Last change: 2
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