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12-21-2009, 03:44 PM   #1
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"Portrait" vs "Landscape" files sizes

I have a K20D and the average file size when an image is taken in Landscape mode is about 10 to 12 MB and when an image is taken with the camera turned through 90 degrees (Portrait mode) the average file size is only 4 or 5 MB. Can someone please explain why this is so. It is one thing if the camera is faulty, but if this is "normal" functioning, I sure won't be taking too many portrait mode pics with it.

12-21-2009, 09:14 PM   #2
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what is in the picture governs how much it can compress it, so since you can't take exactly the same picture in either orientation (unless you're taking pictures of single coloured walls, cloudless skies, etc) it will create different sizes .jpgs This is just a guess, but whatever you regularly take 'portrait' pictures of probably have some underlying feature (more sky?, plain background is it's a portrait of someone?) than what you take 'landscape' picture of (complicated landscapes, groups of people, etc)

Don't worry about it, just take the photo that you want too!
12-21-2009, 09:20 PM   #3
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Take RAW images instead and see the file size remain similar despite the orientation.
12-22-2009, 05:29 AM   #4
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Unfortunately it is regardless of subject matter and colours of sky and clouds and blank walls etc. It happens when the subject matter is identical. There is no plausable reason for this discrepancy. However I think it is a good idea to take pics of the same subject matter, in RAW Mode and in both orientations to see what file sizes it produces.

12-22-2009, 06:03 AM   #5
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weird as that doesn't colate to my files. My K10D takes 2.5-3.2MB JPGs, portrait or lansdscape. My K7 does 5.5-6.5MB, portrait or landscape.
12-22-2009, 08:34 AM   #6
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Take a picture of a white wall in both orientations. What file sizes do you get? I think it's just purely coincidence.
12-22-2009, 09:22 AM   #7
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QuoteOriginally posted by utopiaimagesonline Quote
Unfortunately it is regardless of subject matter and colours of sky and clouds and blank walls etc. It happens when the subject matter is identical.
Subject matter might be identical, but if you turn the camera sideways, you're obviously taking a different picture. So even though both are landscapes, one would have more sky than the other. Or even if both portraits, one would have more out of focus background than the other. And so on. It's just coincidence if so far it seems the "portrait mode" pictures happen to be the ones that allow more compression.
12-22-2009, 11:17 AM   #8
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I shoot raw. The only golden rule I have confirmed is that a bright picture with lots of highlights will be a larger file size than a darker one. This makes sense since there is more information to write in the brighter picture.

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