Hi Erich,
My two cents are that, given the vast range of visual disability, there is no compelling reason to specify a minimum screen resolution; and there may be no practical one to which all could agree.
John
John Rochford<http://profiles.umassmed.edu/profiles/display/132901>
UMass Medical School/E.K. Shriver Center
Director, INDEX Program
Instructor, Family Medicine & Community Health
www.DisabilityInfo.org
Twitter: @ClearHelper<https://twitter.com/clearhelper>
From: Erich Manser [mailto:emanser@us.ibm.com]
Sent: Friday, March 04, 2016 4:53 AM
To: Low Vision Task Force <public-low-vision-a11y-tf@w3.org>
Subject: Minimum Screen Resolution for AA1.4.4 Resize Text
LVTF,
What are the minimum standards being used currently for screen resolution?
Does it bear examination to ensure an updated standard, perhaps in terms of pixel conversion?:
Pixel converter link: http://auctionrepair.com/pixels.html
Also, wondering if there even should be a minimum screen resolution as implied by technique G178.<https://www.w3.org/TR/2012/NOTE-WCAG20-TECHS-20120103/G178#G178-tests> The test procedure indicates to start with 1024x768 or higher. What if someone is using a cell phone or tablet? Believe the iPad can support 1024x768 but most phones run much smaller. Desktops however have increased the resolution considerably.
Does the technique need to be updated or should there be a clarification that the text to support zoom of up 200% start at the default resolution for the device?
For Windows desktop applications, where the default resolution may start at 1920x1200, we find that the default DPI is set to 150%. For testing large and extra large fonts, we recommend that teams set a custom DPI of 225% and 300% respectively rather than just go up to 200%. This is different from user agent zoom though which does handle zooming to 200%
Any thoughts are appreciated. Thank you
[cid:image002.jpg@01D175DB.FA9FCF80]<http://www.ibm.com/able>
Erich Manser
IBM Accessibility, IBM Research
Littleton, MA / tel: 978-696-1810
Search for accessibility answers<http://ibm.biz/a11y-search> [cid:image004.jpg@01D175DB.FA9FCF80]
[cid:image008.jpg@01D175DB.FA9FCF80]
You don't need eyesight to have vision.
