Picture looking sharp in Live View mode, then losing sharpness after picture has being taken

Question

Since recently I am experiencing an issue with the sharpness of my images.
I am using canon 70D with a macro lens for shooting jewellery and I need to have a very clear picture to capture the brilliance of the crystals. That's why I am using a tripod, I am using tethering between computer and camera and I shoot from the software program basically - my camera is as still as it gets when taking a photo.
What happens is that the crystals of the jewellery look sharp when I am looking at Live View mode and then when I look at the picture after it has been shot sharpness is lost to a certain extend.
This is how the image looks before taking the picture (in live view mode):
https://imgur.com/9nSD7W1
This is how it looks afterwards:
https://i.imgur.com/xubtioq
I took these pictures with my smartphone capturing the screen of the camera. If you look closely you will see the difference. It won't be noticeable in daily life pictures I suppose, but for my job, it is an issue.
Does anybody have an idea what is the problem here ? I recently upgraded the firmware to 1.1.3 (canon 70D), of course, that shouldn't be an issue, but I figured I will mention it.
Thank you!

Kai Mattern · Answer

RAW Format
You don't write, if you are taking the photos in RAW format, however, this might be the source of the problem.
If you take photographs in RAW, you are presented with a preview of the RAW rendered as jpg in-camera. This jpg is usually already processed and sharpened.
To get to the same level, you will have to process your RAW files, which includes some enhancing of contrast and sharpness.
LCD Screen Size
The small size of the lcd screen als makes pictures appear sharper than it really is. You have the same effect with images in photoshop - you can downsample a moderately sharp image and resharpen into something smaller that appears to be tack-sharp. Or you can zoom into an image with good sharpness to a point where it no longer appears very sharp.

emmit · Answer

Depending on how live-view is handled, the aperture and speed for live-view can be different than your actual settings for snapping the photo. This can cause the DOF to be deeper during live view than the exposure, and the speed could be faster for livevew than your exposure where you may be getting blur.
The exposure is what matters anyhow. Always check your shots to understand how the DOF is and if it is in focus.

Picture looking sharp in Live View mode, then losing sharpness after picture has being taken

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