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There are a few different philosophies about deleting images. Some people like to delete images that they think are bad so that they don't drown in image a lot when they start their postproduction process. Other people say you should never delete an image, because you never know whether it might be useful or not later. For the sake of the discussion let's split the difference and say that there will occasionally be images that you know will have zero utility later. Those images where your finger is in front of the lens, or you left the lens cap on, for example. Your camera provides a number of ways to delete images as well as to lock images so that they can't be deleted.
Now I know I said earlier that you should always use the Format command to erase your card. Nevertheless, there are some uses for the erase images command. If I go in here first Playback menu into Erase Images I see a few different options. I can erase all images in the current folder or on the card. I definitely always want to use format in place of this. But if I've been meticulously organizing my images into folders as a shoot and I know that I want to get rid of one folders worth of images, but not another then this is a way I can do that without actually trashing all of the images on the card.
Or I can go through and selectively erase images. This can be handy for times when maybe I've accidentally shot a bunch of pictures at the wrong ISO or something. I know I don't want to erase the entire card. I want to just erase some images and go back and re-shoot them. If I pick this I go into basically a select and delete mode. So I can scroll back and forth through my images. When I find one that I want to delete, I just hit the up arrow and a little check mark goes off. This shows a running count of how many images I'm going to delete. So I'm going to select those two and then hit the trashcan to execute the deleting.
It asks me to confirm. I say OK, and those images are deleted. So these are some handy features for selectively deleting, for times when you don't want to erase the entire card. Now I can also protect images to guarantee that they won't be deleted. If I go in here to protect images I get a number of different options. I can select images to protect, I can protect all the images in a single folder, or I can unprotect all images in a folder, or unprotect all images on the card. Note that protecting images does not protect them from a formatting.
If I have all the images on my card protected any images on the card protected and I format, they're all going to be lost. Now what this can be useful for is times when you want to delete all of the images on the card except for just a few. Let's say that you go out one day shoot, you dump images to your computer, you forget to format the card, and the next day you go out shooting again, and now you've got images that are already on your computer on the card and you're getting new images. So you want to delete only certain images. You want to protect today's images and delete all the others.
I can go in here and say I'm going to select this image, and it's just a one shot thing. I press the Set button to protect or unprotect an image and I'm now going to go back and protect this image. Now I'm going to go back to my menu and go down here to erase and now if I say erase all images on the card, it will erase everything, but those two images that I protected. So this is probably the only time where you'll ever use erase all images on card. Once I get the new day's images off, then I'd want to do a format to ensure that my card is all erased properly.
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