Revel: Editing a full resolution image?????

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If I upload from my Mac and then edit on my iPad, will the cloud store an edited full original size resolution image?
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DUNC

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Posted 8 years ago

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Sumner Paine

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The Revel cloud keeps a copy of your full res originals. Edits in revel are non-destructive, so your original is always preserved (unedited). When you export on the Mac, that's when Revel generates a full res version of your photo with your edits applied.
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DUNC

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Thanks. So the integrity of the edits applied to the low res version on my iPad will be fully applied to the high res version in the cloud and eventually to the version on my mac that I export?

How accurate is it to apply edits eg highlights to a low res image? One is assuming that there is no detail you cannot see compared to the full res image.
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DUNC

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I have just tested this. If I export (on my Mac) the edited picture it is only 0.7mb. The original is 2.2mb!!

Why can I not get an edited full resolution image to export?
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Sumner Paine

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On the Mac, first open a photo in loupe view, then click on the actions menu (box with arrow pointing out) then choose Export Photo or Export Original. Either one of those options will export out a full res version of your photo -- either the original with no edits, or the current version with any edits you've done in Revel. If you choose the original, it will be exactly the same size as the file when you first imported it into Revel.

Revel's image processing technology works just as well on mobile as on the desktop. It uses originals and proxies and the same edits render the same way on both.
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DUNC

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Thanks again, this is what I expected but the export photo output is a lot smaller file size which can't be write?
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Sumner Paine

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If you choose the Copy to Clipboard option from loupe view, you'll end up with a smaller version since it's copying the preview version rather than full res.

Another question: is this a photo that was posted somewhere else like Instagram or that was taken on another device and went through Photo Stream?
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DUNC

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Taken on my fuji then loaded to iPad. Then straight load to revel. The fact I can get to then 2mb file suggests it is in the cloud?
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Sumner Paine

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Yes, that is correct. It appears that the edited version compresses more efficiently than the original. If you open the edited version exported on Mac and compare it's pixel dimensions to the original's, they should be the same.
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DUNC

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Does a more compressed file size impact image quality? Yes the pixel counts is nearly the same but it is a little alarming that revel reduces file size by at least a half in an edited version?
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David Franzen, Employee

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Hi Duncan,

We believe the JPEG compression used by Revel when exporting photos produces high quality JPEG files and that there would be little to no practical or perceptible image quality advantage to using less compression for the export.

Do you actually see any image quality problems in exported, full-size photos due to compression (problems not already present in the original JPEGs)? If you do we'd like to see examples of the exported and original photo files. It's also important to know how you are using the exported images and in what context and at what viewing distances any degradation affects how you enjoy your photos.

JPEG compression is a "lossy" compression technique and in general the likelihood of seeing the image-quality degrade increases with the level of compression, but the actual reduction in file size and actual, perceptible change may vary from image to image. JPEG is designed to achieve compression with little perceptible degradation. Being able to produce smaller files with no perceptible degradation in image quality is generally what you strive for when doing JPEG encoding and decoding.
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DUNC

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Why bother compressing over and above the original? As a target customer I just want to have a file my expensive/well regarded camera produced but with edits applied as required. This significant compression just raises questions of image quality.

Why can you not let the consumer chose any compression. This would be the better solution especially as the impact on disk space is an end user issue really.
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David Franzen, Employee

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I don't think the intention of the design is necessarily to compress the edited images "over and above" anything. Revel just simply applies a consistent level of compression to all exported JPEGs, regardless of the size of the original image. The setting used is intended to output JPEGs that look good. Do they look good to you, or do you actually see the compression introducing problems?
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DUNC

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I will make a comparison and reply. I will want to do some print outs to really see this (just realised you cannot print directly from Revel!).

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