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09-18-2009, 10:50 AM   #16
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QuoteOriginally posted by Photong Quote
76800 x 3 = 230400
Ah, I understand what you're saying. But the specs say that the LCD has a resolution of approximated 230000 pixels, not "dots." A pixel will have all three RGB elements in it, no?

At any rate, if 8X is indeed the correct 1:1 zoom factor for the K20D, then the horizontal resolution of that screen is 4672/8=584, not 320. If the screen's horizontal resolution was 320 pixels, then the 1:1 zoom would be 23.5x

09-18-2009, 11:04 AM   #17
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I have noticed this as well with my K-7. I sort of figured it had something to do with showing a lower res JPEG preview for output, but I was probably wrong with that one. It is kind of annoying, when I can look on my K200D and the images look sharper on the screen, but when I put them on the computer, they are fine.

Anyways, I agree that the playback review output does look a bit soft for whatever reason.
09-18-2009, 11:10 AM   #18
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QuoteOriginally posted by falconeye Quote
Magnification x7.3 (x8) is 1:1 on K-7, and x14.6 (x15) on K20D in magnified play mode.
Ideally there'd be a x7.3 option so you could see a 1:1 representation. The closest you can get is x8 or x6.7 and then there has to be some up/down sampling.

I was surprised when I first figured that out--I definitely thought one of the magnification settings would give me 1:1. You'd think it would be easier for the camera to provide that!

But it's not an anti-aliasing issue, it's the wrong magnification, plus we're looking at a jpeg preview, not the real RAW info.
09-18-2009, 11:25 AM   #19
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QuoteOriginally posted by Jim Royal Quote
Ah, I understand what you're saying. But the specs say that the LCD has a resolution of approximated 230000 pixels, not "dots." A pixel will have all three RGB elements in it, no?
Unfortunately, "pixels" and "dots" are too often (and wrongly) used interchangeably in the spec sheets, leading to confusion.

I have not done the maths to answer your other question...

09-19-2009, 03:53 AM   #20
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so the real issue that needs addressing in firmware is the labelling of the zoom level....

8x is meaningless it should say % of real pixels displayed. Which would vary if you were shooting at different mp sizes etc.
09-19-2009, 04:45 AM   #21
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QuoteOriginally posted by WerTicus Quote
8x is meaningless it should say % of real pixels displayed.
Hmmh, what about a custom option "pixel peep friendly"?

Pentax probably just ignored pixel peeping when designing the user interface. Which is further helped by the fact that the K-7's 270dpi pixels cannot be seen unaided (*) by a person with normal age and vision

(*) You would have to be extremely nearsighted and take off your glasses to spot them. The real and only pixel peeping

The human eye's resolution limit for separateble dots is 2' (for line features it is 0.3'). So, the smallest line features are spottable from every distance (1m or less actually). However, to actually spot the pixels, you eye would have to approach the LCD screen to 16cm or less which is only possible up to the age of 35 for a normalsighted person (a 5 year old could approach to less than 10 cm and use a 500dpi screen ).

Last edited by falconeye; 09-19-2009 at 05:12 AM.
09-19-2009, 06:07 AM   #22
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nice and valuable/utilitarian, technical discussion thanks

I also had some troubles finding which magnification is 1:1..

also I use K20d and shoot raw+ jpeg..
my jpeg is the smallest 2mgpx and worst quality only for preview, and to economize the card space.. so which magnification is 1:1 on that 2 mgpxls file.. and whether the camera shows the jpeg not raw file in preview?
09-20-2009, 02:44 PM   #23
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QuoteOriginally posted by falconeye Quote
to actually spot the pixels, you eye would have to approach the LCD screen to 16cm or less which is only possible up to the age of 35 for a normalsighted person (a 5 year old could approach to less than 10 cm and use a 500dpi screen ).
yes but that problem could easily be solved by displaying 200% or 300% magnification of pixel peeping view... as long as no smoothing is applied

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