September LBSIG Meeting

Karmic Changes


Kubuntu Changes

Ubuntu Changes

None worth mentioning.

Image Formats


Raster formats store a color value for each pixel. These can be 1-bit (black and white), 8-bit (256 total colors), 16-bit (64K), 24-bit (16M), or 48-bit (256T). These can be lossless or lossy, depending on the compression algorithm used.

My basic recommendation is to store original images (scans, photographs) as PNG or possibly TIFF. Since your camera won't do that, immediately convert the JPG to PNG for storage and editing. Do all your editing and retouching on the retained full-resolution PNG file, and then make a JPG file as a "final" copy if you need something smaller. This can be generalized: No matter what editing programs you use, never create a JPG unless you know it will never be modified.


Vector files are kept as mathematical formulas, not as dot images. Vector images cannot be displayed; pixels are generated only when ready to display or print. As such, they are infinitely scalable until they are converted to raster. Most vector formats are proprietary (e.g., Corel Draw), but by far the most common are the .TTF (Truetype) or PFx (Postscript) scalable fonts.


Document Publishing



Last modified: Tue Sep 8 18:10:20 CDT 2009