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Comparing ray/doc/man/man1/ximage.1 (file contents):
Revision 1.4 by greg, Thu Jan 1 19:31:45 2004 UTC vs.
Revision 1.6 by greg, Thu Jan 7 17:52:38 2010 UTC

# Line 125 | Line 125 | Redraw the entire image.
125   .TP
126   .BR <return>
127   Display the radiance averaged over the area of interest.
128 + The maximum of the three (RGB) channels is reported.
129   .TP
130   .BR l
131   Display the luminance value in the area of interest.
# Line 132 | Line 133 | This assumes that the image was correctly computed in
133   luminance.
134   .TP
135   .BR c
136 < Display the color in the area of interest.
136 > Display the color in the area of interest, as adjusted by the current
137 > exposure setting.
138   .TP
139   .BR p
140   Display the x and y location of the cursor.
# Line 140 | Line 142 | Display the x and y location of the cursor.
142   .BR i
143   Identify identical pixels by assigning a random color at the cursor position.
144   This is useful for displaying contours, especially when combined
145 < with the -b option.
145 > with the \-b option.
146   .TP
147   .BR t
148   Print information about the pixel under the cursor
# Line 161 | Line 163 | l      luminance value
163   .IP
164   p       pixel position
165   .IP
166 < The default output is "-ood", which prints
166 > The default output is "\-ood", which prints
167   the ray origin and direction.
168   This can be used as input to rtrace(1) to get additional information
169   about the image (ie. pipe the output of ximage into rtrace).

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