Olympus camera overexposes
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From: DaveC on 21 Jan 2010 13:47 Olympus FE-20 - - - > Are the pictures pale-looking even when you upload them to a computer? > > Has the camera previously produced acceptable pictures? > > Is the battery OK? > > Could be a fault in the exposure meter or in the 'firmware'. Wouldn't these faults be evident in the "viewfinder" mode (before taking the exposure)? When I aim the camera at light and dark subjects the camera compensates by "irising" up and down to give what looks to be a properly-exposed "preview" display. Only when the image is captured is it overexposed. Images downloaded and viewed on the computer are overexposed, identical to when viewed on the camera's display. This is a new-to-me camera (used) so I don't know the history. Battery icon is green (fully charged). It doesn't matter whether flash is on or off. Ideas?
From: William Sommerwerck on 21 Jan 2010 14:56 > Wouldn't these faults be evident in the "viewfinder" mode (before > taking the exposure)? When I aim the camera at light and dark > subjects the camera compensates by "irising" up and down to > give what looks to be a properly-exposed "preview" display. > Only when the image is captured is it overexposed. > Images downloaded and viewed on the computer are overexposed, > identical to when viewed on the camera's display. This isn't what I remember you saying. Regardless... If the picture is consistently misexposed, then the exposure-compensation control (assuming the camera has one) should fix the problem. If it doesn't, then the camera needs repair or replacement. As I said, this discrepancy is not uncommon.
From: Whiskers on 21 Jan 2010 15:20 On 2010-01-21, DaveC <invalid(a)invalid.net> wrote: > Olympus FE-20 > - - - >> Are the pictures pale-looking even when you upload them to a computer? >> >> Has the camera previously produced acceptable pictures? >> >> Is the battery OK? >> >> Could be a fault in the exposure meter or in the 'firmware'. > > Wouldn't these faults be evident in the "viewfinder" mode (before taking the > exposure)? Not necessarily. In 'viewfinder' mode one set of 'firmware' routines operates to put an image on the screen; in 'picture taking mode' a different set of routines determines the 'exposure' settings and then encodes the image for 'saving' to memory, probably doing some 'processing' and then compressing the data to a JPEG file, for point-and-shoot cameras. Then yet another set of routines comes into play when you look at the saved image. Any of those firmware routines can become corrupted, for example by physical damage to the camera or exposure to electro-magnetic radiation that's powerful enough to scramble the bits and bytes stored in the micro-chips. > When I aim the camera at light and dark subjects the camera > compensates by "irising" up and down to give what looks to be a > properly-exposed "preview" display. Only when the image is captured is it > overexposed. OK, so the firmware that processes compresses and saves the image, may be faulty; or the firmware that calculates the exposure; or the hardware exposure meter (if there is one, as such). > Images downloaded and viewed on the computer are overexposed, identical to > when viewed on the camera's display. > > This is a new-to-me camera (used) so I don't know the history. > > Battery icon is green (fully charged). > > It doesn't matter whether flash is on or off. > > Ideas? You've got a duff one. A camera shop may be willing to 'look at it', but don't hold your breath. -- -- ^^^^^^^^^^ -- Whiskers -- ~~~~~~~~~~
From: DaveC on 21 Jan 2010 15:40 > If the picture is consistently misexposed, then the exposure-compensation > control (assuming the camera has one) should fix the problem. Compensation doesn't fix the problem, it fixes the symptom. The problem remains. The compensation range on this camera is +/- 2 stops and this is not enough. > If it doesn't, then the camera needs repair or replacement. I'm asking questions to find out what the cause is. Repair options to be considered after this is determined. Thanks.
From: William Sommerwerck on 21 Jan 2010 15:40
> Any of those firmware routines can become corrupted, > for example by physical damage to the camera or exposure > to electro-magnetic radiation that's powerful enough to > scramble the bits and bytes stored in the micro-chips. It doesn't work that way. And if it did, the firmware would likely fail altogether. |