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Software Discuss Olympus Master, Studio and Viewer software applications as well as third party programs like Adobe Photoshop, Lightroom, Apple Aperture, and others.

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Old 6th September 2011
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David Morison David Morison is offline
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Compressing images.

While I was in a bird hide today I got into a conversation with a chap with a 7D plus 600mm plus 1.4 converter. As we were attempting to take photos of a small bird some distance away the conversation including the necessity to crop images of small subjects. He stated that he never cropped but "compressed" to preserve pixels. Now I know about resampling but that is not compressing. Has anybody any idea what he was talking about?

David
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Old 6th September 2011
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Re: Compressing images.

Not possible, I think he probably chooses the option in in the 7 D to use a sensor crop which in the Raw format is • 5184 x 3456• 3888 x 2592• 2592 x 1728.

It is still cropping giving a narrower angle of view, just that it is at the sensor level rather than post cropping but by no stretch of the imagination can it be called compressing.
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Old 6th September 2011
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Re: Compressing images.

Storage is so cheap now - so I'm not sure why the subject even came up...

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Old 6th September 2011
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Re: Compressing images.

Why "preserve pixels" that have no interest and that you're never going to use eg a surrounding amorphous mass of background?

Jim
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Old 7th September 2011
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Re: Compressing images.

Quote:
Originally Posted by David Morison View Post
Has anybody any idea what he was talking about?David
No idea at all.. did he know what he was talking about???
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Old 7th September 2011
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Re: Compressing images.

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No idea at all.. did he know what he was talking about???
Probably not, but I must have looked gullible. Must try to look more unapproachable in hides!

David
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Old 7th September 2011
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Re: Compressing images.

Quote:
Originally Posted by David Morison View Post
While I was in a bird hide today I got into a conversation with a chap with a 7D plus 600mm plus 1.4 converter. As we were attempting to take photos of a small bird some distance away the conversation including the necessity to crop images of small subjects. He stated that he never cropped but "compressed" to preserve pixels. Now I know about resampling but that is not compressing. Has anybody any idea what he was talking about?

David
The only thing I can think of would be saving TIFF files using the loss-less compression option. Of course this doesn't crop the image.

Steve
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Old 7th September 2011
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Re: Compressing images.

Quote:
Originally Posted by Jim Ford View Post
Why "preserve pixels" that have no interest and that you're never going to use eg a surrounding amorphous mass of background?

Jim
Having shot for publication for 30+ years I very rarely crop and when I do it's never more than 20% of the frame leaving lot's of pixels to play with.

If I can't get a usable subject size I don't bother taking the shot.
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Old 8th September 2011
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Re: Compressing images.

Quote:
Originally Posted by David M View Post
Having shot for publication for 30+ years I very rarely crop and when I do it's never more than 20% of the frame leaving lot's of pixels to play with.

If I can't get a usable subject size I don't bother taking the shot.
A good reason for getting a longer lens, or a full frame monster megapixel beast.
I think that is good advice but I guess that many of us still take the shot!
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Old 8th September 2011
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Re: Compressing images.

Quote:
Originally Posted by David Morison View Post
Must try to look more unapproachable in hides!
It doesn't work. I while working in central London the other day I went out to collect my lunch and was asked where the bank was and how to get to the Ethiopian Embassy. I work hard on my scowl but I was rumbled twice in quick succession!

I use compression: JPEG, and Olympus are the best.

Nick
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