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Readability & Contrast Resolution / DPI File Formats Color Space Image Types
 


Readability & Contrast


Explanation of readability covering colors and grays which are or are not easily distinguished from a distance. The ADA (Americans with Disabilities Act) has very stringent requirements on contrast and it's a good idea simply so that people can see your information. Yellow on White is a very bad idea as is Green on Black. There are several studies regarding contrast.

 
Letter Height
  
Readable Distance for Maximum Impact
  
Maximum Readable Distance
  
 
3"
  
30'
  
100'
  
 
4"
  
40'
  
150'
  
 
6"
  
60'
  
200'
  
 
8"
  
80'
  
350'
  
 
9"
  
90'
  
400'
  
 
10"
  
100'
  
450'
  
 
12"
  
120'
  
525'
  
 
15"
  
150'
  
630'
  
 
18"
  
180'
  
750'
  
 
24"
  
240'
  
1000'
  
 
30"
  
300'
  
1250'
  
 
36"
  
360'
  
1500'
  
 
42"
  
420'
  
1750'
  
 
48"
  
480'
  
2000'
  
 
54"
  
540'
  
2250'
  
 
60"
  
600'
  
2500'
  
This information has been made based on information provided by the California Institute of Technology. The distances will vary approximately 10% with various color combinations. 5,280 feet equals one mile. Maximum distance would be RED or BLACK on a WHITE background.

 

 

 

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