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Thumbnail/Quick Preview/Export have strange grey overlay

I spent quite some time googling this issue, so it's starting to seem like a "just me" issue. Yet I can't find a way to solve it, so here I go asking for help.

I have a library with a single project and a series of photos in it. Most photos have a crop, white balance, exposure, sharpen and curve global adjustments, as well as areas with definition brush strokes and dodge brush strokes. The dodge brush was used to make the "almost white" background around product in the shot completely white.

The thumbnails display a light grey (around 250;250;250 RGB, although it varies a bit) blotchy overlay in the areas of the image that are expected to be white. When I click on a thumbnail to bring up the larger image into view, for the first few seconds, while the "loading" spinner is visible on top, the grey overlay can also be seen on the enlarged image. After loading is finished, it disappears. If I turn on the Quick Preview mode, the grey overlay persists and does not go away. Images that I have viewed enlarged with Quick Preview turned off continue to display correctly when I come back to them after looking at other images, as if they are cached in memory. After I view a few dozen images, though, these correct versions seem to be evicted from cache, and I get the grey overlay during the "loading" period again.

The grey overlay does not correspond one-to-one with the area where brush strokes have been applied.

The scariest part of it all is that when I try to export versions, they are exported with the grey overlay intact.

I have tried rebuilding thumbnails, reprocessing masters, repairing permissions, repairing the database. The problem persists. I have tried disabling the dodge adjustment but unchecking it and then checking it again. The problem persists. I have tried removing the dodge adjustment and then brushing it on from scratch. The problem persists.

Out of ideas now. Please help. I would love to attach screenshots, but don't see an option to do so.

Message was edited by: antonzzzz

27" iMac, 2.93GHz i7, Mac OS X (10.6.6)

Posted on Jan 25, 2011 6:59 PM

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6 replies

Jan 25, 2011 9:06 PM in response to antonzzzz

Update: a version created with the "duplicate version" command suffers from the same problem. Also, when you try to open the image in an external editor (as an 8-bit PSD in Photoshop CS3), the image that gets opened has the same grey overlay as the original version. Of course, now that it's been "exported" as a PSD for opening with the external editor, the grey overlay is permanent and doesn't go away when "loading..." is finished.

Jan 25, 2011 9:13 PM in response to antonzzzz

Another update: the grey overlay seems to correspond with the "hot" area of the image. It does not correspond one-to-one with the area you get highlighted in red when you turn on the "Highlight Hot & Cold Areas" option. I suspect that is because the highlight option paints red all pixels where at least one channel is blown, and my guess is that the grey overlay corresponds to areas where all three channels are blown. Either way, when I tweak the Exposure adjustment, the grey overlay pattern changes in a way that corresponds to the way blown highlights change. Tweaking the tone curve also affects the grey overlay pattern.

Sep 22, 2011 1:59 PM in response to antonzzzz

I am having this exact same problem and have tried everything I can think of, but can't get it to export with out the gray blotchy spots. I'm ready to make the image full screen, wait for it to load properly, take a screen shot, crop it and send it like that. Unfortunately that is not an actual solution just a short term fix for a low res web file.

Sep 22, 2011 2:08 PM in response to fluidframephoto

All you are seeing is the difference between the fully-decoded image created on the fly by applying the adjustments saved as instructions in the Version text file to the Master image file, and the Preview created according to the parameters you set in Preferences.


If the Previews don't meet your needs, try a higher quality/larger dimensions.


Likewise for your exports.


What are your Preview and Export settings?


Take a look at the highlighted section

How Aperture Displays Images in the Viewer

on this page in the User Manual.

Thumbnail/Quick Preview/Export have strange grey overlay

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