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jpegs and tiffs [message #57820]

Mon, 24 December 2007 17:33

Josh
Messages: 21
Registered: June 2007

Junior Member

The following program is supposed to write two sine waves, a blue one
and a black one, to two different files. However, on my system, the
jpeg ends up with two black sine waves, whereas the tiff (as well as
the window on the screen) end up with a blue one and a black one as
desired. Any thoughts? Code is taken from Gumley, but with many
changes.

PRO TEST

black = '000000'XL
white = 'FFFFFF'XL
blue = 'FF0000'XL

device, decomposed=1

plot, sin(findgen(200) * 0.1), color = black, background = white
oplot, sin(findgen(200) * 0.1 + 0.2), color = blue
image = tvrd(true=1)
write_jpeg, 'out.jpg', image, true=1
write_tiff, 'out.tif', reverse(image, 3), 1

END

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