experimental image-Jpeg vs. posterized GIF

Posterized GIF vs. Standard JPEG

image #1
size: 384 X 256
resolution: 72 X 72
colors: 24 (8 bit)
file length: 21.1KB
format: GIF89a

image #2
size: 384 X 256
resolution: 72 X 72
colors: 16.7 mill ( 32 bit)
file length:32.7KB
format: JPEG

This file is from a 35mm slide loaded into Adobe Photoshop from a photo CD. I adjusted the levels and sharpened the image and then saved it as a Photoshop 3.0 working file. The working file was then used to create the following image files.

The image on the left was posterized using 6 levels of posterization and then converted to Indexed mode using 24 colors and saved as a Compuserve GIF file (GIF 87a). It was further converted into an Interlaced GIF (GIF 89a) using Thorsten Lemke's Graphic Converter, ver. 2.0.7.

I saved the file on the right as a standard JPEG using normal quality compression. Convential wisdom maintains that photographic items be saved as JPEGs and line art be saved as GIFs. By converting a photographic image to line art via posterization, it is often possible to develop a more "graphic" image that downloads and displays faster than a standard JPEG and takes up less disk space.

Mail to bmcc@pacifier.com