User_Manual-PILATUS-V1_2.doc 23/57
Display tools Description
black near zero, red fading to pink and
white at the high end)
thermal color lookup table going from blue through yellow and red,
but no greens
decades The values between Min and Max are displayed linearly,
but with the scale wrapping around Scal number of time.
Thus, Scal = 1 is linear, Scal = 5 covers the range Min to
Max with 5 linear segments going from 0 to 255, 0 to 255,
etc.
This gives lots of artifical contrast that is good for
smoothly-varying SAXS data, but is otherwise rather non-
intuitive.
power The image is displayed between Min and Max using the
transfer function:
(# grays)*((value - min)/(max - min))*(Scal/15)
# grays is usually 256. Thus, a small value of Scal (~3)
gives a very steep transfer function at low values, and very
little contrast at high values.
Scal = 15 is a linear transfer function; Scal > 15 is nearly
useless.
reverse The values are reversed - x-rays in the image become
black rather than white.
Useful for crystallographic images.
Several test images and graphs are included in the system.
Try the following:
imagepath examples
disp testimg.tif
disp gray20bit.tif
grafpath examples
grafdemo
More examples are in:
/home/det/p2_det/programs/tvx/test/images -and-
/home/det/p2_det/programs/tvx/test/graphs
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