Go to the Select menu, then select Save Selection. Then type in a name for the selection and click OK.
Alpha channel, take a look at CHANNELS palette
Mask will be saved as Alpha channel in CHANNELS panel (Window > Channels).
Go - File - Save or SAVE AS
You can save Lab images in PSD, PSB, Photoshop EPS, Photoshop PDF, Photoshop Raw, TIFF, Photoshop DCS 1.0, and Photoshop DCS 2.0 formats.
To crop a selection in Photoshop, use the Crop Tool to draw a selection around the area you want to keep. Then, press Enter or click the checkmark icon to apply the crop.
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 7 just like any other Photoshop, it uses .psd to save, open etc. You can save as other format too.
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Using selection tools from Toolbox: Magic Wand, Quick Selection tool, Rectangular and Elliptical Marquee tools...
First save photos on hard drive, right click on photo then choose Save or Save As, then open it Photoshop throught File - Open
Adobe illustrator (AI) is a vector file format to save vector illustrations. It is the default format for Adobe illustrator. Photoshop cannot save the images in to AI format but it can be opened in Photoshop.
When a photoshop file is too large (in bytes) to save as a regular .psd, it will be saved as a Photoshop Large Document Format or a .psb file.