When you need a fresh, completely blank canvas to work on, you can create a new file.
To create a new file, choose File > New.
Here you will be able to name your file, set up the correct page size and orientation for your document.
In the Preset dropdown menu you can find such common sizes as letter, legal, tabloid, etc.
Typing in exact values for Height and Width gives you more control over the size and orientation of your page.
We will be working with PIXELS.
Resolution is the number of pixels on a printed area of an image.
The higher the resolution, the more pixels there are on the page, the better the quality of the image.
The standard recommended resolution for printed images is 150-300, for Web images it is 72.
Choose the background: white, color or the background color. When you have entered all of your document settings, click Create.
Use File > Save or File > Save As regularly as you modify an image, so that you do not lose any changes you make should a system crash occur.
Use File > Save a Copy to save your image as a .jpg or .png so that you can upload it to your website.
Use this format as you work on your image.
This format will save all your Layers and effects.
This should be your day to day format.
NEGATIVE
Large file size.
Not viewable without Photoshop
Widely used for images on the internet and the standard file format of most digital cameras and phones.
Use this format when you are ready to hand in your work or upload it to your website.
This format will compress your file to a smaller file size.
NEGATIVE
Does not save Layer and effect information.
Will not save transparency information.
Used for images where transparency is important.
Use this format when you want to remove the background from a picture.
Transparency information is shown as a checkered pattern in Photoshop.
Graphic Interchange Format
GIFs are most common in their animated form.
In their more basic form, GIFs are formed from up to 256 colors in the RGB color space. Due to the limited number of colors, the file size is drastically reduced.
BEST USES: Web graphics, small icons, animations and simple images.