Mask will be saved as Alpha channel in CHANNELS panel (Window > Channels).
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
I assume you named each mask, if not, then under Select go to save mask and give each mask a name. Then do a load mask, on the layer you want, of each mask that you saved. But you must check Add Mask each time you add a new mask. They will all be added to each other.
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.
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.
If you save your work in Photoshop in .psd format vector objects are stored as vectors, so you can open that file and work with vectors (change them, resize, change color or replace them, even delete if you dont need in project).
eat rocks
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.