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Hey Roban
Removing backgrounds from images is always tough... especially if the image is complex or has lots of thin edges (ie. a persons hair).
Generally, i start with the 'extract' filter in Photoshop CS3 and then fine tune the output by editing the pixels.
It's also a good idea to use the 'Burn' tool to burn your edges a litle bit... this is especially effective if the object is going over a dark-ish background.
If the background you need to remove is a solid colour, you can also use the Select >> Color Range tool. This will select all pixels that match a certain range of colours, so if the subject has some color that matches the background, you may have to deselect that area after you've done the Select >> Color Range.
The Select >> Color range is best used when the edges of the subject are considerbaly different in color than the background.
As for file types... PNG is your best bet for web use. GIF's are restricted to a maximum of 256 colours (Including transparent) and use Binary Transparency which means each pixel is either 'on' or 'off'.
PNG's use alpha transparency which means each pixel can have a percentage value for opacity This makes edges a lot smoother and you dont have the 'ghost' problem you have with gifs.
Cheers.
Mike.
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