One of the easiest ways would be to select the layer that contains the item you would like to stretch.
Ctrl + T Or Cmd + T - This tool is transform and can be found in one of the tabs above your canvas listed at the top of the program.
Using the bounding box constraints select an anchor point and drag from either side or just one side to resize to your desired requirements.
Then press enter to complete the transformation.
WARNING: Stretching your image may distort it.
PHOTOSHOP
Photoshop is picture editor,what you mean?good picture editor?best free picture editors are GIMP and Picasa,i recommend to you Picasa
from filter menu
no
Adobe Photoshop CS5
You can use photoshop or another picture editing program to digitally edit the picture.
Adobe Photoshop CS5
Photoshop can do this
Open Photoshop, open your picture in Photoshop from File>Open, then start making changes. Of course if you are unfamiliar with Photoshop, you may want to learn the basics first.
photoshop
A Bitmap is a file you can save pictures as like JPEG or PNG, in photoshop it means save the picture as a bitmap
Photoshop is one such tool for that. Pixlr is another tool which can be used like Photoshop.