Popo you nailed my question which was not properly put together sorry. Thanks for the information I thought that you need to have a very small aperture F2.8 to get such images plus PP thanks again Popo this will help me a great deal! Nalin
OK...so I understand you were talking about that out-of-focus blurred background. I too didn't really understand the 'matte' reference at first. Indeed, large apertures are one way to get more softly blurred, out of focus backgrounds (called 'bokeh'). However, there are lots of factors that go into getting those backgrounds, and small apertures aren't always necessary.
First, sensor size makes a difference. Small sensor cameras, like P&S cameras, will have more trouble with this effect, because they have very wide depth of field...more stuff in focus for a much longer distance. Typically, the larger the sensor, the shallower the depth of field control. Full frame sensor DSLR cameras will be the best for this. However, even with small sensor ultrazoom P&S cameras, you can still get blurred backgrounds. Which brings me to...
Second, distance is the biggest factor. The farther the photographer is from the subject, and the more zoom he uses to get closer to the subject, the shallower the depth of field will become. So that's why typically big-zoom lenses and long telephoto lenses will produce this effect more than small zooms.
Third, distance from subject to background also makes a big difference. If you are shooting a bird sitting just a foot away from a branch behind him, you would need a very large aperture (small f-stop) on a big sensor to get the depth of field shallow enough to blur the branch. However, move that branch back 10 feet behind the bird, and now even at F8 or F11, you still have an out of focus background.
So put all of those things together...DSLR with larger sensor, a big zoom lens, lots of distance between photographer and subject, and lots of distance between subject and background, and you can get those nice, matte looking backgrounds even with a fairly small aperture.
And the lens can make a difference too. Some lenses are known for having a very nice, smooth transition from focus area to out of focus area - a 'creamy' look to the backgrounds and soft circles for highlight areas - this is what is desirable in good 'bokeh'...whereas some lenses can be a little harsh - not as smooth in the background, or highlights that are out of focus looking misshapen or not nicely rounded. This is what is often referred to as 'harsh bokeh'.
Hope that helps!
Sony DSLR-A580 / Sony 18-250mm / Minolta 50mm F1.7 / Sigma 30mm F1.4 / Tamron 10-24mm / Tamron 150-600mm / Tamron 90mm F2.8 macro / Minolta 300mm F4 APO
Sony A6000 / 18-55mm F3.5-5.6 / 55-210mm F4-6.3 / 10-18mm F4 / 35mm F1.8 / 16mm F2.8 / via manual adapter, lots of Pentax K mount, Konica K/AR mount, and Leica M mount manual lenses