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Forum: Pentax DSLR Discussion
03-31-2007, 06:54 AM
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Old? good? weird..... :-9
Nice to hear you explanation about word "pressing". It is correct translation and in our language it means just what you described, besides that it means also something you call "pushing", what actually means in our language something you do if gasoline were run out.... :-)
I depends.... as far as I know it is called "amplifying" when it is done by circuitry and "pushing" if it is done in PP.... and results are quite different too.
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Forum: Pentax DSLR Discussion
03-31-2007, 05:48 AM
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I agree that there is some patters in the pictures with severe underexposure (- 2-3 stops) and then "pressing" (as it was called here in old good film days :-) them to "correct" exposure + 2-3 stops at post processing.
Maybe I am fool, and have been some decades, but I systematically reject pictures (negatives) with so severe unintentional underexposure. Maybe this is reason why I cannot see this phenomena at all.
If the underexposure is intentional; you set ISO 1600 and there is not even then enough light and you take the picture underexposured -3 stops, then correct this in the PP with +3. Lets calculate: 1600, 3200, 6400, 12800 (+3 stops from 1600). You actually took the picture with 12800 ISO setting, correct? what were you expecting as an result?
Or if you made an mistake and underexposured your picture several stops at ISO 400 or ISO 200, as far as I can see, it is not your cameras fault that you cannot get good results. It is completely your own fault. Uncomfortable plain truth. I have to deal with this truth (and live with it) allmost every time I down load my memorycard.... and push the del-button.
How many correctly exposed pictures really have this phenomena? visible without any arrows or un-normal PP:ing?
This method was used in film days; 400 ISO film was exposed with 800 ISO or even 1600 or 3600 settings and then this was "corrected" in developing phase. It made photographing possible in difficult situations. Results were not near as good as they were at 400 ISO, but you got the pictures needed. Or this result was sometimes used as an effect... harsh big grain and high contrast.
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Forum: Pentax DSLR Discussion
03-31-2007, 05:20 AM
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Agreed.... if this "serious" phenomenon has to be pointed out with arrows, well.... I saw those spots, but thought they are some kind of reflections, or flare.
From monster car picture I couldnt find out any bands.... only band-like forms in shadows were windows (left upper corner).
Just came back home yesterday from two week trip to Japan. I photographed several hunreds of pictures in dim lighted dojos (kendo) and surprice, surprice, coudnt find from my pictures anything like this thing called VPN.
(thought VPN is "Virtual Private Network", but working at IT-industry makes me think oddly :-)
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