apca-introduction

commit

cfb081a78afb73ff1d1db5818e03016edb9cd5fe

parent

9305232ec5f36394397fe6682decb75cec12c589

Author

Tobias Bengfort <tobias.bengfort@posteo.de>

Date

2022-07-16 10:40

refine wcag6 value to 0.4

Diffstat

3 files changed, 4 insertions, 4 deletions

diff --git a/analysis.md b/analysis.md

@@ -231,7 +231,7 @@ function normalize(y) {
  231   231 
  232   232 The four curves for APCA are very similar. Despite the very different formula,
  233   233 the WCAG 2.x curve also has a similar shape. I added a modified WCAG 2.x curve
  234    -1 with an ambient light value of 0.6 instead of 0.05. This one is very similar
   -1   234 with an ambient light value of 0.4 instead of 0.05. This one is very similar
  235   235 to the APCA curves. The second column shows the differences between the APCA
  236   236 curves and this modified WCAG 2.x.
  237   237 

diff --git a/plots/sRGBtoY_comparison.png b/plots/sRGBtoY_comparison.png

diff --git a/plots/sRGBtoY_comparison.py b/plots/sRGBtoY_comparison.py

@@ -37,7 +37,7 @@ if __name__ == '__main__':
   37    37 	fig, axes = plt.subplots(4, 2, sharex=True, sharey='col', figsize=(6.4, 8))
   38    38 
   39    39 	for i in range(4):
   40    -1 		wcag6 = wcag(x, WCAG_FACTORS[i], 0.6)
   -1    40 		wcag6 = wcag(x, WCAG_FACTORS[i], 0.4)
   41    41 
   42    42 		for exp in APCA_EXPONENTS:
   43    43 			y = apca(x, APCA_FACTORS[i], exp)
@@ -53,7 +53,7 @@ if __name__ == '__main__':
   53    53 	axes[3][0].set_ylabel('blue')
   54    54 
   55    55 	axes[0][0].set_title('sRGBtoY')
   56    -1 	axes[0][1].set_title('ratio APCA / WCAG 0.6')
   -1    56 	axes[0][1].set_title('ratio APCA / WCAG 0.4')
   57    57 
   58    58 	fig.legend([
   59    59 		'APCA 0.56',
@@ -61,7 +61,7 @@ if __name__ == '__main__':
   61    61 		'APCA 0.62',
   62    62 		'APCA 0.65',
   63    63 		'WCAG 0.05',
   64    -1 		'WCAG 0.6',
   -1    64 		'WCAG 0.4',
   65    65 	], ncol=3, loc='lower center')
   66    66 
   67    67 	plt.tight_layout()