I opened up my sd card and caja doesn't preview some of the pictures. so I checked th files' size and they were less than 10MBs but the file size to preview was set to 10MB. I increased it to 1G anyways, refreshed the page, and bam! the files previewed. I thought that was great. Then I transferred the files from the card to the computer and once the files had been transferred they wouldn't preview. I again checked the preview file size to ensure it hadn't changed but it was still set to 1G. I then decreased and then increased the preview file size but that didn't help any. So what's wrong?

I found this but wasn't sure it still applied seeing as how I got them to preview before transferring them and this is for the previous version of Mint; Mint12.
Currently I run mint13 on a 32 bit comaq cq57. I was also thinking it didn;t apply because the new filemanager is caja and not nautilus.

what found:
Modern cameras can store raw images which are a must for a serious photographer. Unfortunately raw image previews are not shown by Gnome's file manager Nautilus.

However, there is already a workaround type of solution for this. I will describe it in four steps.


Step 1:
Install gnome-raw-thumbnailer package.


Step 2: 
Create a file /usr/share/thumbnailers/raw.thumbnailer

Step 3: 
Put in these lines:

Exec=/usr/bin/gnome-raw-thumbnailer -s %s %u %o
MimeType=image/x-3fr;image/x-adobe-dng;image/x-arw;image/x-bay;image/x-canon-cr2;image/x-canon-crw;image/x-cap;image/x-cr2;image/x-crw;image/x-dcr;image/x-dcraw;image/x-dcs;image/x-dng;image/x-drf;image/x-eip;image/x-erf;image/x-fff;image/x-fuji-raf;image/x-iiq;image/x-k25;image/x-kdc;image/x-mef;image/x-minolta-mrw;image/x-mos;image/x-mrw;image/x-nef;image/x-nikon-nef;image/x-nrw;image/x-olympus-orf;image/x-orf;image/x-panasonic-raw;image/x-pef;image/x-pentax-pef;image/x-ptx;image/x-pxn;image/x-r3d;image/x-raf;image/x-raw;image/x-rw2;image/x-rwl;image/x-rwz;image/x-sigma-x3f;image/x-sony-arw;image/x-sony-sr2;image/x-sony-srf;image/x-sr2;image/x-srf;image/x-x3f;

(Steps 1, 2 and 3:)
http://ubuntuguide.net/raw-cr2-image-pr ... -thumbnail

Step 4: 
Nautilus/Settings/Preview
Set Max Size to something more suitable than it is now by default. For example, there are options for 1, 5, 10 and 100Mb. My camera's raw images are 15 Mb so I have to choose 100Mb.

This worked with 64-bit Mint 12.
:-)~MIKE~(-: