A 3 megapixel photo and a 10 megapixel photo will look the same on your computer monitor.
They will look the same if you printed them at a size of 6 x 4 inches.
But, if you printed them at a larger size the 3 megapixel photo will look blocky, the 10 megapixel photo will look good.
More megapixels is good for printing large pictures.
More megapixels is not needed to display on a computer screen.
HD (high definition) is not anything special.
It is a video that has an image size of 1920 x 1080 pixels.
A HD video made from 3 or 10 megapixel photos will look the same (great).
I have made several HD slide show DVDs using a Blu-Ray burner and Blu-Ray media.
You only need a photo that is 1920 x 1080 or larger.
Of course you must play the DVD on a Blue-Ray DVD player and a HD television set to see them in true HD.
You can also make a slide show in wide-screen and produce a normal DVD.
When viewed on a HD television through one of the newer normal DVD players that "up-convert", will produce a picture that will be difficult to tell from a Blu-Ray DVD.
If you have a HD television set, I recommend that you get either a Blu-Ray DVD player or a normal DVD player that can "up-convert"
The up-converting DVD player produces a much better picture that the older normal DVD players.
What is the difference between the image in 3M mode and the same image shot in 10M. Will there be any difference in the clarity?
Can i convert the images to the HD quality ?