3 pp questions

amit

Mu-43 Regular
Joined
Oct 10, 2019
Messages
47
Hey !

1. I noticed that the raw file is larger (the photk is wider) than the jpeg . Why ?
2. Are the unused edges worse than the rest of the photo?
3.When PP , I allways add exposure , do you think my camera is underexposing by porpuse? Em10ii

Thank you
 

agentlossing

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Jun 26, 2013
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Andrew Lossing
3. Google ETTR
Just to expand a little bit on this, you will probably notice that the brightest highlights go to white in digital photography. Most sensors, M4/3 included, tend to have somewhat ugly transitions to that pure white part, or highlight clipping. Underexposing lets you recover shadow detail without running into as many of those ugly transitions from very light-colored to pure white spots, which, especially under heavy PP, can really ruin an image sometimes.
 

Replytoken

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May 7, 2012
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Puget Sound
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Ken
Just to expand a little bit on this, you will probably notice that the brightest highlights go to white in digital photography. Most sensors, M4/3 included, tend to have somewhat ugly transitions to that pure white part, or highlight clipping. Underexposing lets you recover shadow detail without running into as many of those ugly transitions from very light-colored to pure white spots, which, especially under heavy PP, can really ruin an image sometimes.
By the same token, ETTR (without clipping) allows you more data to work with, and often highlight recovery (without clipping) is easier than opening up shadows. In short, it is good to know what you are trying to accomplish and how techniques can help assist you in PP.

--Ken
 

wjiang

Mu-43 Legend
Joined
Sep 7, 2013
Messages
7,518
Location
Christchurch, New Zealand
1. The edges of the RAW are used for vignetting and distortion compensation as part of software lens corrections. Some RAW processors do not perform the correction and thus show all the pixels.

2. In such a scenario, yes the edges are in a sense worse, because the vignetting and distortion corrections are not applied. The corrections do cost a bit of sharpness at the edges, however.

3. The camera meters using the JPEG preview, so your JPEG settings will affect metering that are not apparent when you then process the RAW.
 

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