On Fri, Dec 7, 2012 at 1:09 PM, Brian Cluff <brian@snaptek.com> wrote:

This isn't going to solve your problem, but I just wanted to point out that you will want to turn the preview threshold way back down.

The reason being is that your can cause your computer to become unresponsive or at least very slow from the preview function.

I discovered this because of a talk that I was giving on Inkscape. I wanted to show a difference in file size, in an extreme way between a raster file format (PNG in this case) and Inkscape's native SVG format. I did this my making a rectangle 20,000 by 20,000 rectangle in inkscape and then saved it as an SVG. The SVG file was maybe 1k. I then exported a PNG version that ended up being just over 4MB, much smaller than I thought it would be, but being all one color it was a perfect case for PNGs compression to shine.

Then the problems started. Just after creating my examples, my computer started to freeze when I entered the directory that I was using for my presentation with Dolphin, KDE's file manager. I didn't know what was going on, because it was repeatable and I hadn't done any upgrades.

What ended up being the problem was the 4MB file was below the system threshold for creating a thumbnail and so it was trying to decompress the image in order to create a thumbnail. The problem was it needed over 16GB of RAM in order to do that. And that amount exceeded the amount of RAM and swap combined on my system, not that I was willing to sit around and wait for it to finish, if it had.

I ended up deleting that land mine of a file and just simply mentioned what I had discovered instead of coming up with hard numbers. The SVG version of the file would preview instantly... so go SVG!

Everyday files aren't going to need 16GB+ of RAM in order to create previews, but with today's high MP cameras, it's not unlikely to come across images that will need a gig or two. That can greatly slow down everything just to get a thumbnail in a file manager. I would siggest cranking it down to the point that most things show up, but the big images are left out. Then just use a dedicated image viewer that most likely does a MUCH better job at caching thumbnails so you only have to generate them once.

Brian Cluff

On 12/07/2012 09:45 AM, Michael Havens wrote:

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
<http://ubuntuguide.net/raw-cr2-image-preview-in-gnome-nautilus-using-gnome-raw-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~(-:

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