Hi John, John Culleton wrote: > I wonder how > many of her cautions are universal and how many just > dependent on the program used to create the graphics?
Her comments on web graphics are, IMHO, universal, as opposed to limited to one program or another. > Even if a person simply cannot create clean edges (one of > the most common mistakes is using "tansparent" on a layer - > transparent doesn't work..you need to use the background > colour as the background colour on the image around any > curved lines. Also that "delete" background rarely gives a > clean lift - that all needs to be erased one pixel at a > time.) they can go with text only, or visit one of the > 1000s of sites that offer free web tools, or avoid curved > edges (in most cases jaggies are only an issue around > curved edges). This is a fair comment. Transparency (in GIF, and as supported by IE in indexed PNGs) is limited to one palette entry which is completely transparent, and the rest completely opaque. Usually, smooth rounded edges are obtained by antialiasing the curve, going in grades from opaque to transparent over a number of pixels. Since you can't antialias to transparent in gif, round edges usually look crap. However, if you have a background that isn't transparent, then you can antialias from white to green, say, just fine, and have some of that smoothness kept across an indexing operation. However, PNG supports indexing much more advanced than that - essentially, an indexed palette entry in png has an alpha component, so with indexed png you can antialias to transparent. However, this isn't supported in IE for Windows. You can also use 32 bit PNG which is funny supported on both IE and Mozilla, but is a much larger file size. Cheers, Dave. -- David Neary, Lyon, France E-Mail: [EMAIL PROTECTED] _______________________________________________ Gimp-user mailing list [EMAIL PROTECTED] http://lists.xcf.berkeley.edu/mailman/listinfo/gimp-user