Quote:
Originally Posted by log
Don't need any fancy equipment or a microscope to see that the quality of these screens is different, contrast ratio is clearly better on the e-Ink pearl screen on the right.
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Maybe you don't. But for people who want accurate data and understand how light affect the color/shades we see, we do.
I wish people would stop taking a picture and eyeballing the differences then put it on the web as a "prove" of A is darker/brighter than B. Cameras are such inappropriate tools for this task. In your example, it's very obvious that there was a single light source very close to the left side of the K4. Based on the picture, you could even argue that the left side bezel on the K4 is brighter than its right one. Light intensity could fall off rapidly depending on how close the light source is to the object, which makes the K4 on the left side appear to be much lighter than the Sony ereader on the right. This can be calculated using the Inverse-Square Law(in case you're interested
http://tinyurl.com/3q3us5o). Assuming you actually own a K4 and took the picture and didn't just copy it from some website and speculate, you'll be surprised to see how the result would differ and most likely reverse if you swap the two readers position, and make sure you use the same aperture, iso, lens & shutter speed setting for the camera at the exact same distance.
Just saw the pearl display spec on the eInk.com(
http://www.eink.com/sell_sheets/pear...ll%20sheet.pdf):
White State: 70 (minimum)
Dark Sate: 24 (maximum)
If the above spec applies, all 3 ebook readers I've tested are well within the spec for the max dark state with
18.3 for K4, 21.5 for K3 & 18.8 for NookSTR. In the end, they're all fine, I myself couldn't reliably tell which one is better than the other as the viewing condition changes just by eyeballing them.
Edit: updated dark state stats with hi-res mode reading(more accurate)