Graphics Programs Reference
In-Depth Information
quality of the image.
The large image is the original snap I took at the beach. The image below it is the cropped version of the image
which is now the same size as the slide on the right (1024 x 768 at 72 ppi).
Basic image file types
Of the many different image file formats, you really only need to be familiar with a few:
•
JPEG.
The most common image file format you will work with is JPEG (.jpg).
JPEG stands for Joint Photographic Experts Group, but you do not need to
remember that part. Just remember that JPEGs (jay-pegs) use “lossy”
compression, which means that a bit of image quality is lost during compression.
Usually, the loss in picture quality is only noticeable when using a high level of
compression. JPEG is the preferred format for photographs used in Web pages.
Small JPEGs may look great on a Web site, but they usually look horrible if you
significantly increase the image size for a slide. When you're selecting large
images for slides, make sure the size and resolution of the original image will work.
JPEG compression does a good job with photographs, especially when you have
