Warp <war### [at] tagpovrayorg> wrote:
>   Now the lower half of the rendered images is a checkerboard pattern of
> alternating black and white pixels.

  There was a warning somewhere that a checkerboard patter should *not* be
used for this kind of test because it doesn't work properly with CRT monitors.
Instead, alternating horizontal lines should be used instead.

  I changed the images to use horizontal lines. Now the POV-Ray 3.7 image
background looks equal in brightness, while there's a remarkable difference
in the POV-Ray 3.6 image.

  It was not, after all, a problem with my monitor gamma. It was a problem
with the test being skewed by how CRT works.

  So yes: I now see how the gamma correction of 2.2 changes the rgb 0.5 to
a shade which closely matches half brightness emulated with alternating
black and white lines. (The gray stripe at the bottom still looks to me
like biased too bright, but maybe it's a question of getting used to it.)

  There's still the problem of the image map incorrectly brightening, though.

-- 
                                                          - Warp

Post a reply to this message