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Re: Measuring colours accurately in mobile apps

for

From: Steve Green
Date: Jun 23, 2021 1:12AM

Thanks for the suggestion of the app - I'll try that.



I am surprised you don't see the colour degradation in the screenshots, although it is much more pronounced with some colour schemes than others. We created some test pages so we knew the exact colours and contrast ratios, and the error levels were astonishingly high when emailing screenshots.



Here are some examples. The true colours were green text (#006600) on white (#FFFFFF), which has a contrast ratio of 7.24:1. The values we measured were:


Measurement Method
Foreground Colour
Background
Colour
Contrast Ratio
Error
Actual Values
#006600
#FFFFFF
7.24
0%
Safari (iPhone) > Zoom desktop share
#066208
#FFFCFE
7.47
3.2%
Chrome (Android Pixel 4a) > Zoom desktop share
#005400
#FEFEFD
9.17
26.7%
Screenshot of image attached to an email
#005500
#FDFDFB
8.97
23.9%
Screenshot of image embedded to an email
#015700
#FFFFFF
8.88
22.6%



Steve