QuickView uses EXIF data for preview, even when bogus. A plist to turn that off?

Question

We moved to MBPs with SnowLeopard recently and just found that many downloaded images  usually from publicity or stock-photo sites - give distorted or no preview when we use QuickView (tapping the space-bar) on them in the Finder.
Some investigation showed that the distorted images have EXIF data tha has either been corrued or purposefully messed with. Here's an example where the QV preview widget opens to the width of the screen but at minimum height:
Image width          : 4992
Image height          : 6666
Number of bits per component          : {8,8,8}
Compression scheme          : uncompressed
Pixel composition          : RGB
Orientation of image          : 1
Unknown tag (0)          : 0,0,3,0
X resolution          : 0.0 ppi (pixel per inch)
Y resolution          : 300.0 ppi (pixel per inch)
Image data arrangement          : 1
Resolution unit          : inch
Software          : Adobe Photoshop CS3 Macintosh
File date and time          : 2009:02:20 15:47:58
-- Exif IFD --          :
Color Space          : Uncalibrated
Valid image width in pixel          : 2250
Valid image height in pixel          : 3000
-- Thumbnail IFD --          :
Compression scheme          : JPEG
X resolution          : 300.0 ppi (pixel per inch)
Y resolution          : 300.0 ppi (pixel per inch)
Resolution unit          : inch
Offset to JPEG SOI          : 394
Bytes of JPEG data          : 3933
The EXIF data says the X resolution is 0.0ppi.
These files all open fine in Photoshop or Graphic Converter. Sometimes GC's resolution tool shows that the horizontal & vertical resolutions are different (300 x 0.3 for example) and I can correct it, re-save the jpeg image. and QV then previews them just fine in the Finder.
Most, however only have this bogus resolution in the EXIF data and evidently QuickView preferentially uses that info.
There are tools that can be used to simply carpet bomb the EXIF data of a batch of files, but most of it is useful to us so we'd rathr not rsort to that. Is there a QV plist where clever folks can edit it so QV uses the actual image resolution rather than what's in the EXIF data?
Incidentally, QV in Leopard ignored this data which is why we only now began to encounter images where QV is useless. Bogus EXIF resolutions have probebly been in image headers for years and we did not realize it until we found SnowLeopard's Finder payed attention to them.

Answer 1

We moved to MBPs with SnowLeopard recently and just found that many downloaded images  usually from publicity or stock-photo sites - give distorted or no preview when we use QuickView (tapping the space-bar) on them in the Finder.
Some investigation showed that the distorted images have EXIF data tha has either been corrued or purposefully messed with. Here's an example where the QV preview widget opens to the width of the screen but at minimum height:
Image width          : 4992
Image height          : 6666
Number of bits per component          : {8,8,8}
Compression scheme          : uncompressed
Pixel composition          : RGB
Orientation of image          : 1
Unknown tag (0)          : 0,0,3,0
X resolution          : 0.0 ppi (pixel per inch)
Y resolution          : 300.0 ppi (pixel per inch)
Image data arrangement          : 1
Resolution unit          : inch
Software          : Adobe Photoshop CS3 Macintosh
File date and time          : 2009:02:20 15:47:58
-- Exif IFD --          :
Color Space          : Uncalibrated
Valid image width in pixel          : 2250
Valid image height in pixel          : 3000
-- Thumbnail IFD --          :
Compression scheme          : JPEG
X resolution          : 300.0 ppi (pixel per inch)
Y resolution          : 300.0 ppi (pixel per inch)
Resolution unit          : inch
Offset to JPEG SOI          : 394
Bytes of JPEG data          : 3933
The EXIF data says the X resolution is 0.0ppi.
These files all open fine in Photoshop or Graphic Converter. Sometimes GC's resolution tool shows that the horizontal & vertical resolutions are different (300 x 0.3 for example) and I can correct it, re-save the jpeg image. and QV then previews them just fine in the Finder.
Most, however only have this bogus resolution in the EXIF data and evidently QuickView preferentially uses that info.
There are tools that can be used to simply carpet bomb the EXIF data of a batch of files, but most of it is useful to us so we'd rathr not rsort to that. Is there a QV plist where clever folks can edit it so QV uses the actual image resolution rather than what's in the EXIF data?
Incidentally, QV in Leopard ignored this data which is why we only now began to encounter images where QV is useless. Bogus EXIF resolutions have probebly been in image headers for years and we did not realize it until we found SnowLeopard's Finder payed attention to them.