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Resizing a page is helpful when trying to adjust the sizing on your current page. It is considered resizing, because your current page will be resized and your work will not be lost, as opposed to setting the page size which erases the current page Using the resizing function will resize all layers.
In order to resize your current page select Image>Resize Image in the menu bar.
This will open a dialog box which will allow you to resize your current page and preview it before allowing it to resize.
Taking a deeper look into the controls of this function:
1. Current Width and Current Height represent the size of your current page.
2. New Width and New Height boxes allow you to set your own dimensions.
3. Constrain Perspective refers to the proportion of the image. When this box is checked, and a number is entered into either the width or height boxes, the other number will be automatically completed to keep the image's proportion. Without this box checked you are able to enter both the width and height manually, but it will not nessecarily maintain proportioned.
4. The drop down box allows you to choose between different resizing algorithms that each have different advantages.
Nearest neighbor is used when you do not want to introduce a new color into your image. For example, if you have a strictly black and white image, resizing will not add any colors (shades of gray) and will only use black and white.
Bilinear is generally used as the quickest of the four.
Bicubic is moderately quick and is often used as an industry standard.
Lanczoc3 is the slowest but has the softest and most blended look. This is great to use when scaling an image down.
Each of the four have varying results, it is encouraged to test them out, with the preview button, to get a better understanding of how each works.
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