Overview. This is an HTML tutorial explaining about cross-platform images suitable for use in a Web document and also an explanation about image transparency. Resources are given for the image software and the Related Links."
Introduction to Image Files
The format of an image to be used on the Web should be a file type that is "cross-platform" which means that several types of operating systems can use that file type. Platforms are operating systems and system configurations such as a Macintosh running OS X on the G4 with dual processors, a PC running Windows XP, or another computer running the Linux operating system. Your images will need to be in a format that all of the computers operating on the Web can use. Popular file formats for Web use are the GIF and JPEG file formats. All graphical browsers support GIF and JPEG file formats. PNG file formats can only be recognized by some of the graphical browsers but not all of them.
TRANSPARENCY. Transparency is a term used to indicate a GIF89a format file in which a selected color is "taken out" of the graphic file when displayed, so that the browser background shows through the image making the image appear to "float" on the screen. JPEG files do not support transparency nor do GIF87a images.
Creating and manipulating images requires drawing or graphics programs and tools. Paint Shop Pro, Adobe Photoshop and Adobe Illustrator are used by Web designers.
Macintosh users: Adobe PhotoShop is available for the Macintosh computer and Quark Express is another publishing and photo editing program for the Mac.
|BMP||Microsoft Windows BitMaP file|
|CUR||Microsoft Windows CURsor file|
|EPS||Encapsulated PostScript file|
|GIF||CompuServe Graphics Image Format|
|HDF||Hierarchical Data Format|
|ICO||MS Windows ICOn file|
|ICON||Sun Icon and Cursor file|
|JPEG (.JPG)||Joint Photographers Experts Group file|
|MPNT||Apple Macintosh MacPaiNT file|
|.NIF||Not Image File|
|PBM||Portable BitMap file|
|PGM||Portable Grayscale Map file|
|PIC||PIXAR PICture file|
|PICT||SoftImage PICT file|
|PIX||Alias PIXel image file|
|PNG||Portable Network Graphics|
|PNM||Portable aNy Map file|
|PPM||Portable Pixel Map file|
|RGB||Silicon Graphics RGB image file|
|RGBa||4-component Silicon Graphics image file|
|RLA||Wavefront raster image file|
|RLE||Utah Runlength-Encoded image file|
|RPBM||Raw Portable BitMap file|
|RPGM||Raw Portable Grayscale Map file|
|RPNM||Raw Portable aNy Map file|
|RPPM||Raw Portable Pixel Map file|
|SYNU||Synu image file|
|TGA||Truevision Targa image file|
|TIFF||Tagged Image Format file|
|VIFF||Khoros Visualization Image File Format|
|X Stardent||AVS X image file|
|XBM||X11 BitMap file|
|XWD||X Window Dump image file|