Originally posted by audiobomber - If you take a photo in jpeg and the highlights are blown, the highlights are irrecoverable, nothing can be done about it.
- If you take the same photo in raw (same exposure), the highlights appear to be blown in the raw viewer and will be blown if you convert to jpeg without adjustment. If, OTOH, you back off on the exposure before conversion, you can recover the highlights.
The OP is shooting in jpeg and complaining of blown highlights, which IME is fairly common with the K-x (rare with a K20D). All I was trying to say, is that he should shoot raw so the highlights can be recovered. The usual metering of the K-x will allow this.
Dan. Totally blown highlights (as opposed to just over-exposed) are irrecoverable no matter whether you are shooting in 12 or 14 bit RAW or anything else. Typically you can recover 1 to 1.5 stops in RAW, more than that and it's toast. I agree he should should in RAW because there is far more latitude for recovery but even RAW and PS can not save totally blown pixels.
Quotes.
Photography on the Net
In the case of blown highlights, the starting image should not have completely blown highlights in it. Even if the photo is just not quite completely "blown" there is hope.
However – if those highlights are really, really blown – there's no hope of recovery. So here's a useful tip: If you are photographing something with lots of white (or nearly white) in it, underexpose it a little. By underexposing it you will be able to save the highlights, and still correct the rest of the image later on using software.
eHow - PS
Large areas of overexposure are very difficult to correct realistically. Small areas of blown-out whites can occur no matter how precise you set your exposure controls and are straightforward to fix,
but an overall overexposed photo likely will not be able to be recovered.
d
igital-photography-tips.net
If you’ve overexposed you’ll end up with blown highlights–
you can never recover detail in these areas of a photograph. dpnow
Clipped highlights are those highlights that have saturated the A/D converters and have a value of 255.
There is no information contained in the clipped highlights and also there is no any type of post processing that can do anything, except trying to guess/fake of what probably has been there.
The RAW to JPEG converter simply discards the highlights present in the RAW data by compressing them all to the max value of 255.
RAW mode does offer a finer resolution of light levels and also a wider dynamic range and can somehow help in most situations, but not at all times.
Photocamel Histograms from a camera do not show the RAW values but the JPG values if processed using the parameters set on the camera when exposure was made. They can show a blown area which is actually just potentially blown if not processed correctly.
Photoargus (talking about using PS to recover highlights)
While this technique has the potential to repair blown highlights, it is not a miracle worker. RAW format gives you a wonderful advantage over jpeg and other formats in the exposure correction area, but can only typically increase or decease the exposure by 2 full stops, maximum.
If you’ve overexposed an area by more than 2 stops, then your photo could quite possibly be outside the realm of exposure correction.
I could go on and on but basically they are all saying the same thing. The reason I'm going to these lengths is because this is in the Beginner's Corner and they need to understand that totally blown highlights are exactly that, irrecoverable, and the only way to stop this happening .... is before it happens via the settings in their cameras and not relying on miracles in PP. There is a ton of information out there and many people will show you how to use different programs to recover over-exposed images.
However they are not miracle workers and a totally blown image is not going to be recoverable simply because the information is not contained in that pixel !