Bitmapped graphics

We are now looking specifically at Bitmapped graphics and I have shown you a variety of pictures trying to illustrate different things. Lets start with:

Compression

Compression means to reduce the file size of something (in this case an image file). There are two categories that compression falls into lossless and lossy.

    • Lossless – no quality is lost
    • Lossy – some quality is lost

Interlacing

This means to view an image while it is downloading. Non-interlaced graphics download a line at a time whereas interlaced images initially appear blurred and appear to come into focus.

All of these ideas are best understood when you see a visual example, so make sure you look at the powerpoint notes below:

image-compression.jpg

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