Macworld: Lossless trickery ...

Up to Discussions in Digital Photos

This Question is Not Answered

1 "correct" answer available (4 pts)

7 Replies Last post: Mar 30, 2008 10:31 PM by geoffry

geoffry

7 posts since
Jan 27, 2008

Mar 12, 2008 7:56 PM

Lossless trickery

Does anyone know if Apple’s Image Capture, Preview, iPhoto, or even Adobe Bridge perform an actual lossless rotation of a JPEG image?

I came across an seemingly interesting app called Xee ( http://wakaba.c3.cx/s/apps/xee.html ), which is touted by some as being more versatile than Preview.

One of the claims on the site is that it will ‘Losslessy rotate and crop JPEG images. This lets you edit your digital photographs without losing quality by re-compressing them like most other editors do.’

Lossless rotation is what caught my imagination.

Apple Help doesn’t exactly say how it does it -- or if it does it at all. Does any one know if the above Apple apps can perform the lossless trick?

Reply Tags: resolution, converting, format, jpeg

Tom_Diola

1,918 posts since
Oct 19, 2001

1. Mar 12, 2008 8:09 PM

in response to: geoffry

Re: Lossless trickery

When you rotate and export in iPhoto are you saying you lose resolution?

smax013

1,520 posts since
Jul 6, 2007

2. Mar 12, 2008 8:13 PM

in response to: geoffry

Re: Lossless trickery

geoffry wrote:Does anyone know if Apple’s Image Capture, Preview, iPhoto, or even Adobe Bridge perform an actual lossless rotation of a JPEG image?

I came across an seemingly interesting app called Xee ( http://wakaba.c3.cx/s/apps/xee.html ), which is touted by some as being more versatile than Preview.

One of the claims on the site is that it will ‘Losslessy rotate and crop JPEG images. This lets you edit your digital photographs without losing quality by re-compressing them like most other editors do.’

Lossless rotation is what caught my imagination.

Apple Help doesn’t exactly say how it does it -- or if it does it at all. Does any one know if the above Apple apps can perform the lossless trick?

See if this might help:

http://sylvana.net/jpegcrop/losslessapps.html

It is a list of programs that supposedly can do JPEG lossless rotation.

Member of the "Crazy Mac Users who run Anti-virus on their Macs" club - come join us and you too can be snickered at!

geoffry

7 posts since
Jan 27, 2008

3. Mar 12, 2008 10:42 PM

in response to: smax013

Re: Lossless trickery

Thank you, I'll give it a look. It is curious Apple doesn't incorporate the lossless trick in its own apps. Or maybe it does ... perhaps someone will write & tell us. Thank you again.

dcpics

831 posts since
Feb 6, 2004

4. Mar 27, 2008 11:09 AM

in response to: geoffry

Re: Lossless trickery

I'm not sure about iPhoto but Aperture is lossless and I'm pretty sure iPhoto is as well.

Aperture maintains the original file and a small data file is associated with it that records all the changes you make to an image, from rotating to cropping to toning and on and on. You can always revert to the original file as it the data is not touched. When you call up a photo that you have worked on, the data file allows aperture to show on screen and in output what changes you have made.

geoffry

7 posts since
Jan 27, 2008

5. Mar 28, 2008 6:13 PM

in response to: dcpics

Re: Lossless trickery

Thanks, that is good news abt Aperture at any rate. Yes, I wondered abt iPhoto as well. It is curious tho' that it is not actually stated to be lossless there. You'd really think Apple would be quite proud of the fact -- as presumably they are with Aperture. I haven't used Aperture; I'm still getting to know CS3 properly; but Aperture does interest me, & it has received splendid reviews. Do you know if Adobe Bridge is lossless also?

Cheers.

OldToad

387 posts since
May 25, 2003

6. Mar 30, 2008 5:59 PM

in response to: geoffry

Re: Lossless trickery

iPhoto is not lossless. But there's a freeware application, Xee, which will losslessly rotate photos.

geoffry

7 posts since
Jan 27, 2008

7. Mar 30, 2008 10:31 PM

in response to: OldToad

Re: Lossless trickery

Got it. Thanks, Old Toad. Cheers.

Go to original post

This Question is Not Answered

Mar 12, 2008 7:56 PM

Lossless trickery

Actions

More Like This