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Card reader not loading images from SD card properly.

Christal Steele , Jan 08, 2012; 06:14 p.m.

Okay, I'll try to explain this the best I can. We bought 2 new 16 GB San Disk Extreme HD Video cards (level 10's) for our Alaska trip. Upon loading them from our card reader, we're having a devil of a time. For some reason they load some of the images with the 'IMG' before the number of each image, but then many of the images load with only the 'MG' part, leaving out the 'I' in front of IMG. This, of course, causes our images to load in the wrong numbered order.

This does not happen with our lower capacity cards. They seem to load just fine without this problem. So first of all, I'd like to know if you think the cards are defective. And secondly, is there any way to prevent this from happening? Thirdly, I can go in and rename all the 'MG' images to 'IMG', and that solves the problem. But it is taking for ever! Is there a way I can do this in a batch by any chance, doing all of them at the same time?

I would greatly appreciate any help you can give.


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Matt Laur , Jan 08, 2012; 06:37 p.m.

First: Did you format the cards in the camera before using them?

Second: With regard to the order the files are in ... You can always just sort them by date/time, which makes the file names and formats irrelevant.

Christal Steele , Jan 08, 2012; 06:52 p.m.

Yes, Matt, we always format new cards or reformat cards we've deleted images on. As for your other idea.......we may not have the most ideal work flow, but at least this time that idea won't work very well. We generally put my images and my husband's images in the same category i.e. 'Alaska'. We know which images are which based on the numbers. His camera is set to use a different series of numbers than mine. If we use the date/time, then all of our images will be combined, which we don't want. Perhaps I need to come up with another way of doing things. :-)

Christal Steele , Jan 08, 2012; 07:00 p.m.

Not that it makes any difference, but there is actually an underscore in front of the 'MG', so it looks like this: _MG instead of IMG

Brooks Gelfand , Jan 08, 2012; 08:36 p.m.

On many cameras, image names that begin with IMG denote jpeg images taken in the sRGB color space. Images names that begin with _MG denote jpeg images taken in the Adobe RGB color space. You probably changed the setting on your camera part way through your shooting session.

Jerry Coffin , Jan 08, 2012; 11:45 p.m.

If you want to fix the names, it's pretty easy. Assuming you're running windows, open a command prompt, change to the directory where the files are stored, and give a command like:

ren _*.* I*.*

and it'll change that initial character from an underscore to an "I" without affecting the rest of the name. You should be able to do roughly the same on a recent Mac, but I use them little enough that I'll leave exact directions to somebody else (the main thing would be to change the "ren" to "mv", but it might take a little more than that).

Christal Steele , Jan 09, 2012; 12:14 a.m.

Brooks, I'm sure what you're describing could happen, but in this case I had 2 different SD cards that both had the same problem. So I highly doubt that it was something I did in the camera, or it wouldn't have affected both cards. It's nice to know that's something to watch out for though. Thanks so much!

Jerry, Whoa! You're getting in way over my head. :-) I'm encouraged by what you're telling me though, so tomorrow I'll try to get my husband to help me. I don't even know what you mean by 'open a command prompt', so if that tells you anything about my computer skills. :-) I'm running Windows 7, which is new to me, having just switched from XP. If you could tell me how to open a command prompt, then I can snoop around from there and try to do what you suggested. It would save me an enormous amount of time. I've been changing them all one by one, and I have LOTS of pictures.

Thanks to you both!

Brooks Gelfand , Jan 09, 2012; 02:08 a.m.

Hi Christal,

How many SD cards you have is immaterial. The camera's naming convention is that the name of any image taken in the sRGB color space starts with the characters IMG; any images taken in the Adobe RGB color space will start with the characters _MG. The camera does this automatically. It should be in your camera manual.

It is probable that, whether you intended to or not, you were switching between the two color spaces. This switch can be as simple as changing one of the preset exposure modes. If you had associated sRGB with say the P mode and Adobe RGB with the A mode as you switched between A and P modes you would also switch between sRGB and Adobe RGB.

In other words there is nothing wrong with your SD cards, card reader, or camera. All are doing their jobs properly. If you examine the EXIF data on the files with names beginning with IMG, you will find all of them are in the sRGB color space. If you examine the EXIF data on the files with names beginning with _MG, you will find all of them are in the Adobe RGB color space.

Christal Steele , Jan 09, 2012; 07:36 a.m.

I'm out the door this a.m., but I wanted to quickly thank you for your excellent explanation. I'll take a closer look at this when I get back home today. Thanks for taking the time! :-)

Christal Steele , Jan 10, 2012; 05:59 p.m.

Brooks, well, you were certainly correct. I looked at the EXIF data, and indeed the images with IMG had sRGB in the color space. However, the images with _MG were listed as 'uncalibrated'. So there was a difference, as you said.

Is there anything I can do to prevent this from happening in the future? Any setting I can make in my camera (Canon 60D)? This has really caused an awful mess for me trying to organize my images.

Thank you for persisting with my ignorance! :-)

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