apca-introduction

commit

3441ef2954cee304745ba0dcb3dc429d45d3690e

parent

0ca48c409bb28ab37fea6f10865d07ac88d97001

Author

Tobias Bengfort <tobias.bengfort@posteo.de>

Date

2022-07-31 22:04

add contrast constancy caveat to spation frequency section

Diffstat

1 files changed, 7 insertions, 1 deletions

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

@@ -294,7 +294,13 @@ Interestingly, a lower spatial frequency is not always easier to read though.
  294   294 per degree. Below that, features get slightly harder to detect. (Perhaps that
  295   295 is the reasons for the "you don't see the forest among the trees" phenomenon.)
  296   296 
  297    -1 It is not obvious how to define spatial frequency in the context of the web.
   -1   297 There is one caveat though: The spatial frequency only defines the contrast
   -1   298 threshold under which a pattern is not perceivable at all. Above that it has
   -1   299 barely any effect. In the context of accessibility we should usually stay well
   -1   300 above that threshold. So it is not clear whether spatial frequency is a useful
   -1   301 concept in this context.
   -1   302 
   -1   303 On top of that, it is not obvious how to define spatial frequency for the web.
  298   304 For text, font size and weight certainly play a role. But different fonts have
  299   305 wildly different interpretations of these values. Since fonts depend on user
  300   306 preference, we cannot know beforehand which fonts will be used. We also don't