Page 70 - DCAP109_GRAPHIC_TOOLS

Unit 3: Introduction to Photoshop

PhotoShop can also help you resize an image. Lets face it, things arent always the way we want Notes
them. You can shrink or stretch an image to fit your liking, or you can cut out a small part of an
image and make it larger.

Resolution

As previously mentioned, all web images should be set at 72 dots per inch. This can be achieved
through scanning, or by manually changing DPI settings in PhotoShop.
Adding or subtracting pixels is easy. Deciding what color to make the new pixels is another
story.

Notes PhotoShop is just a computer program, so it doesn’t even know if a new pixel is part
of a line, or if its part of someone’s face. PhotoShop doesn’t even know what a face is!
When changing resolution, PhotoShop runs complicated algorithms on an image to decide
exactly how to change it. PhotoShop does an amazing job of adding and subtracting pixels, but
it isn’t magic. Usually you can only move up or down in resolution by about 1/3 before the
image really suffers.

Changing Resolution (but not size) for Web Images

Sometimes you’ll have an image that was scanned at a higher or lower resolution than you need.
Its size is fine, you’ll only need to change the resolution.

1. Click Image-> Image Size

Figure 3.10: Image Size Dialog Box

Source: http://www.awdsf.com/courseware/photoshop/ps2_ImageSize_Resolution_files/
image002.jpg

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