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standalone_srgb_antialiasing
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fill out the README with more detail

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Allen Webster 2023-04-28 20:00:33 -07:00
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@ -23,3 +23,47 @@ From top to bottom the experiments are:
interpolated linearly by
alpha = (x - left)/(right - left)
color = (1,1,1)*(1 - alpha) + (0,0,0)*(alpha)
2. Pulls out three colors into solid color blocks:
(0,0,0), (0.5,0.5,0.5), and (1,1,1)
3. Tests sRGB -> Linear approximation function. (Right side only)
Compares two discrete gray pallets.
The top shows 16 levels of gray by sampling them from an SRGB texture.
The bottom shows the same 16 gray values with the input colors converted
from sRGB -> Linear by x^2.2 instead of by texture sampling.
4. Tests color gradients
(1,0,0) >>> (1,1,0)
(1,1,0) >>> (0,1,0)
(0,1,0) >>> (0,1,1)
(0,1,1) >>> (0,0,1)
(0,0,1) >>> (1,0,1)
(1,0,1) >>> (1,0,0)
5. Tests partial transparency
3 horizontal stripes - opaque
3 vertical stripes - alpha = 0.5
3 vertical stripes - alpha = 0.75
6. Tests rectangle anti-aliasing by drawing rectangles with a width
of 2 placed at various sub-pixel positions
7. Tests circle anti-aliasing by drawing three circles of various
radii. The circle anti-aliasing is computed with a highly accurate
area-under-the-curve integration method - see the "sanity test"
functions for how the accuracy of the pixel coverage is verified.
8. Tests circle anti-aliasing with colored backgrounds and shape colors
to see if anti-aliasing gives rise to any colored fringes.
In the top-left corner there is a gamma calibration test image. The
top left corner is "0.5 Gray" in the "Linear color space" and the
bottom right corner is "0.5 Gray" in the "sRGB color space". The other
two corners are identical black-and-white checkerboards. When squinting
to physically blur the checkerboard, the brihgtness should resemble the
brightness of the top left corner on a correctly calibrated monitor.
The anti-aliasing of the rectangles and circles should also look better
on linear color space side for a correctly calibrated monitor.