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JPG is a commonly used method of lossy compression for digital photography (image). The degree of compression can be adjusted, allowing a selectable tradeoff between storage size and image quality. JPG typically achieves 10:1 compression with little perceptible loss in image quality. JPG compression is used in a number of image file formats. JPG is the most common image format used by digital cameras and other photographic image capture devices; it is the most common format for storing and transmitting photographic images on the World Wide Web. 

These format variations are often not distinguished, and are simply called JPEG. JPG is often used on digital camera memory cards, but RAW or TIF format may be offered too, to avoid it. The JPG file is wonderfully small, often compressed to perhaps only 1/10 of the size of the original data, which is a good thing when modems are involved.

While, PSD is a proprietary file format used to create and edit images in Adobe Photoshop. It is a widely accepted format as it supports all available image types – Bitmap, RGB, Duotone, Grayscale, Indexed Color, CMYK, Lab, and Multichannel.

The maximum size of a PSD file (with file extension of ‘.psd') is 30,000x30,000 pixels and may be saved with 16 bits per color channel. PSD image files may be opened with Adobe Photoshop or Photoshop Elements on Windows; and Adobe Photoshop, Photoshop Elements, or Apple Preview on Mac OS.

PSD to JPG conversion is the conversion of data from the Adobe suite to that of JPG and is the best option out there in the market these days if you wish to grow your business without really expanding and spending on infrastructure and hiring on roll employees. Basically, converting PSD to JPG is very complex and tedious process. As to convert from PSD to JPG services require deep knowledge, experience and skills to perform this task in an effective and efficient way is the need of the hour.

PSD format for any particular website is definitely not an easy task. Moreover, in PSD format the data organization can become very time consuming. Therefore, for easy accessibility of data and to improve file management PSD to JPG conversion is very important.

Source : http://www.articlesbase.com/file-types-articles/psd-to-jpg-4497229.html

Becoming a commercial airline pilot is an arduous task which requires physical, practical and mental training before the aspiring pilot even gets to sit inside a real airplane cockpit. One of the most invaluable stages of this process is to get familiar with practical knowledge, techniques and experience of the various controls found inside the cockpit. The most common methods employed by flight schools is to use accurate life-like jet simulators.

These flying simulators accurately recreate the flying experience so it is as close to real life as possible. Accurate aircraft physics, real-world terrain, actual planetary alignments are just some of the things a good jet simulator will add to give the pilot a real "in the skies" experience. More advanced airplane simulators will also factor in night flying, weather conditions, and different seasonal environments and time zones.

These days it is possible to obtain a good feature rich jet simulator which can run on an everyday home computer. More advanced users will employ multiple monitors and add a joystick and yoke for even more accurate control of their virtual plane. In all honesty it would not be an understatement to state that the wealth of features available on these home jet simulators is comparable to an authentic replica of a cockpit environment powered by the latest software and hardware costing millions!

There are many jet simulators available that can be downloaded to your computer today to give the budding pilot a realistic flying experience. Some of these flight simulator downloads allow you to choose from 100's of different aircrafts, including a choice of helicopters, variable weather conditions and lifelike terrain based on actual data.

A decent jet simulator will also go that one-step further to give you a true feel for flying with realistic controls which experience real time lags, and even periodic system failures. This all helps in ensuring the trainee pilot knows what to do if something went wrong in mid-air.

An accurate flying simulator goes a long way in preparing pilots before they take to the air.
Luckily though this experience isn't just limited to top notch flight schools as gamers and hobbyists also have the chance to enjoy these airplane simulators in the comfort of their own environment.

Source :
http://www.articlesbase.com/computer-games-articles/why-jet-simulator-games-are-used-by-top-pilots-4497224.html