iPhone 3GS has color depth of 24-bit color or 18-bit color? I don't understand why Apple did not disclose all the detailed specifications. On apple site, it only tells the most basic specs not all specs so Wikipedia has to search iPhone specs in other sources.

For example, rhe wiki page http://en.wikipedia.org/wiki/IPhone said iPhone 3Gs has 
color depth of 18-bit color while http://en.wikipedia.org/wiki/IPhone_3GS said 24-bit color.

Have anyone who did use both 3Gs &amp; 4 or 4s?  Did u see the picture clearer in 4 than in 3GS?

So which color depth does iPhone 3GS have?

24-bit color or 18-bit color?
i found the answer, iPhone 3Gs use 24-bit Emulation color not the 24-bit true color.


  18-bit:  Almost all of the least expensive LCD displays (such as typical
  twisted nematic types) provide 18-bit color (64 × 64 × 64 = 262,144
  combinations) to achieve faster color transition times, and use either
  dithering or frame rate control to approximate 24-bit-per-pixel true
  color,[12] or throw away 6 bits of color information entirely. More
  expensive LCD displays (typically IPS) can display 24-bit or greater
  color depth.


http://en.wikipedia.org/wiki/24-bit_color#True_color_.2824-bit.29

Note: 18-bit color display was used either dithering or frame rate control to simulate 24 bit (16.76 million colors) per pixel true color; yielding sub-optimal color accuracy and often having poor viewing angles (http://techreport.com/review/23204/tr-summer-2012-system-guide/14)

So correct answer is 24-bit emulation color.