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Preview.app bug (need confirmation)
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Mac Elite
Join Date: Feb 2001
Location: Canaduh
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I downloaded a 8.3 MB jpg from NASA today that brought my computer to a near standstill. As so as I clicked the link to view the picture (panorama taken by the Mars rover, Spirit), my hard drive started grinding and OS X became hugely sluggish. It took about 5 minutes for the photo to load.
I saved it to the desktop and then opened it with Preview. Same problem. Tremendous grinding and non-responsive OS. I watched Preview in Activity Viewer while it was trying to open the 8.3 MB picture. Preview.app's real memory usage soared, going as high as 215 MB. Even when the picture was finally displayed, Preview.app was consuming huge amounts of memory.
Anyone know why such a small jpg would cause so much grief for OS X 10.3.5? I've got 512 MB of RAM, btw.
The link to the jpg is below. Launch Activity Viewer and try it yourself to see if the the same thing happens.
http://photojournal.jpl.nasa.gov/jpeg/PIA06917.jpg
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Mac Elite
Join Date: Dec 2000
Location: Northern California
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Is 8.3MB really "such a small jpg"?? You're right, though, Preview doesn't handle large image files well. Even opening a couple MB file taken by my 4MP digital camera takes a few seconds.
So I opened up the file you linked in Preview, and it took about 40 seconds to open (leaving the system a little slow, but not unresponsive), and Preview's now using 22MB real memory. I watched Activity Viewer and it soared to 586MB while opening (I have 1GB RAM). I have no idea how normal this is.
As a comparison, I opened the file in Photoshop CS and it took less time to open (and at least Photoshop has a progress bar for this sort of thing  ), and is now using 480MB real memory.
(Last edited by Apfhex; Oct 7, 2004 at 11:17 PM.
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Mac Elite
Join Date: Feb 2001
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I just noticed that the pixel count is around 22000 x 4400. Could that account for the slowness and the high RAM usage.
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Grizzled Veteran
Join Date: Sep 2001
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pants in preview on my revB powerbook. A snap at work on Dell Precision 340 in Windows Pic and fax viewer.
Preview really handles it badly. When zooming in, it does it quick, but retains the pixelated thing that preview does with images. It didn't look like it was going to clean up the image any time soon, if at all.
Graphic converter handles it much better.
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Mac Enthusiast
Join Date: Jul 2002
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Preview sucks.
It decodes the entire image, eating RAM for 22000 x 4400 pixels, but then it limits the display to 4000x4000.
Hopefully Preview will Suck Less in Tiger.
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Mac Enthusiast
Join Date: Apr 2003
Location: New York, NY
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Is there a good alternative to Preview that's a very small app which can load a file quickly (i.e. don't need to load Acrobat Reader for a PDF, or Photoshop for a JPEG, etc.)? And my #1 beef with Preview, I want it to quit when I close the open window. I have that stupid icon hanging out in my dock all the time, when all I needed was to look at a picture for 2 seconds and then close it. 
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Moderator  Join Date: Apr 2001
Location: Wasilla, Alaska
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Wonder how QuickImageCM would handle it? (I'm not at my mac.)
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Mac Elite
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Mac Elite
Join Date: Nov 2001
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Originally posted by arekkusu:
Preview sucks.
It decodes the entire image, eating RAM for 22000 x 4400 pixels, but then it limits the display to 4000x4000.
Hopefully Preview will Suck Less in Tiger.
Preview, as a whole, freaking ROCKS. It is AWESOME for PDFs and other things. Search on Preview is BLINDINGLY fast. Try reading a PDF in Acrobat Reader compared to Preview, and let me know what sucks.
I never use it for JPEGs, so I can't say for sure on that. But I don't think as a whole it "sucks" and can suck less. I'd still recommend iPhoto or Photoshop (maybe Express) for viewing photos.
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Mac Elite
Join Date: Feb 2001
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Originally posted by CatOne:
Preview, as a whole, freaking ROCKS. It is AWESOME for PDFs and other things. Search on Preview is BLINDINGLY fast. Try reading a PDF in Acrobat Reader compared to Preview, and let me know what sucks.
I never use it for JPEGs, so I can't say for sure on that. But I don't think as a whole it "sucks" and can suck less. I'd still recommend iPhoto or Photoshop (maybe Express) for viewing photos.
Download the jpeg listed above. Preview.app is a great "all-rounder" but it chokes on this jpeg.
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Mac Enthusiast
Join Date: Jul 2002
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Originally posted by CatOne:
Preview, as a whole, freaking ROCKS. It is AWESOME for PDFs and other things.
Right, please allow me to amend my statement:
Preview's handling of bitmap image formats sucks.
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