AI Lab Logo Page

Introduction

The AI Lab Logo is available in a variety of formats and sizes for use in your Web pages and other documents. You may use the tables in the next section for viewing the different logo sizes and for downloading copies of the logo.

All of the logos are stored in a central area on the AI Lab's Web server. If you want to incorporate a logo in your Web pages, it is best to refer to one of the copies already stored on the server, rather than making a private copy of an image file. Please see the section on Tips for Using the Logos below for help on how to do this.

The images of the logo at the particular sizes given below have been specially optimized by generating pixel maps using different-sized original PostScript drawings, rather than rescaling one image to the different sizes. This resulted in better anti-aliasing characteristics. Some tips are given later below for how to generate other sizes of the logo.

The images all use 65 or fewer colors. Here are some other characteristics of the different formats:

GIF: CompuServe Graphics Interchange Format version 87a format, anti-aliased to a white background. The white background is set to be transparent. The images are not interlaced, because tests showed that interlacing produced worse looking results when the images were displayed by Netscape's Web browser.

EPSF Color: Encapsulated PostScript (EPSF 3.0) format. Use this when you expect the print output device will be a color printer; use the EPSF B/W format described below when you expect that the print output device will not be a color printer.

EPSF B/W: Encapsulated PostScript (EPSF 3.0) format. You should use this version of the logo when you expect that the print output device will not be a color printer, because it will result in better print quality.

TIFF: Tagged Image File Format.

PPM: Portable Pixmap format.

XPM: X11 Pixmap format version 3.

BMP: Microsoft Windows ``BMP'' format.

PCX: ZSoft ``PCX'' format, common on IBM-compatible PCs.

PICT: Macintosh ``PICT'' graphics format, in Macbinary file format. (When downloading this file format to a Macintosh, make sure to set the file type in your FTP program to ``Macbinary''.)

You may notice the absence of JPEG format files. This is because JPEG is not really suitable for encoding line drawings with only a few distinct colors -- JPEG is better for full-color images. Attempting to convert the logos to JPEG format invariably leads to poor-looking results and file sizes that are 2-4 times the size of the GIF format files.

Tables of Logos in Different Sizes and File Formats

To download a particular format, please click the left mouse button of your Web browser in one of the boxes below the particular size of logo that you want to use.

The sizes shown above the logo images are given as height x width in pixels.

Icon logos

32x32

Format:	GIF	EPS (color)	EPS (b/w)	TIFF	PPM	XPM	BMP	PCX	PICT

48x48

Format:	GIF	EPS (color)	EPS (b/w)	TIFF	PPM	XPM	BMP	PCX	PICT

54x54

Format:	GIF	EPS (color)	EPS (b/w)	TIFF	PPM	XPM	BMP	PCX	PICT

Full Logos

178x74

Format:	GIF	EPS (color)	EPS (b/w)	TIFF	PPM	XPM	BMP	PCX	PICT

200x84

Format:	GIF	EPS (color)	EPS (b/w)	TIFF	PPM	XPM	BMP	PCX	PICT

220x92

Format:	GIF	EPS (color)	EPS (b/w)	TIFF	PPM	XPM	BMP	PCX	PICT

272x120

Format:	GIF	EPS (color)	EPS (b/w)	TIFF	PPM	XPM	BMP	PCX	PICT

340x140

Format:	GIF	EPS (color)	EPS (b/w)	TIFF	PPM	XPM	BMP	PCX	PICT

420x170

Format:	GIF	EPS (color)	EPS (b/w)	TIFF	PPM	XPM	BMP	PCX	PICT

520x210

Format:	GIF	EPS (color)	EPS (b/w)	TIFF	PPM	XPM	BMP	PCX	PICT

Tips for Using the Logos

The logos are available from a special directory from the AI Lab WWW server, referenced as "http://ai.eecs.umich.edu/logos/". You can incorporate a logo into your Web pages without making a personal copy of a logo file by putting in a reference of the following form into your HTML documents:

    <IMG SRC="http://ai.eecs.umich.edu/logos/logo-WIDTH.gif">

Here, ``WIDTH'' stands for one of the width dimensions tabulated above (e.g., 220, 340, etc.). For example, to put an inline copy of the 272 pixel wide logo into a Web page, you can use the following HTML code fragment:

    <IMG SRC="http://ai.eecs.umich.edu/logos/logo-272.gif">

If you need a logo at a size not provided here, you can produce a version at a difference size by using one of the following two approaches:

Using Adobe Illustrator and PhotoShop. The best way to generate a logo at an arbitrary size is to use a color EPS file in combination with Illustrator and PhotoShop. Here is a step-by-step example for use on an Apple Macintosh computer to create a new GIF logo at an arbitrary size:
1. FTP a copy of one of the color EPS files to an Apple Macintosh that has both Adobe Illustrator 6.0 and Adobe PhotoShop 3.0 or later available.
2. Start up Adobe Illustrator.
3. Bring up the color EPS file in Illustrator.
4. Select the entire graphic, then scale the illustration by double-clicking on the resize tool in the tool palette and supplying a desired scaling factor. You can use the Tab Ruler to judge how big the illustration is.
5. Once you have the desired size, copy the graphic to the clipboard.
6. Start up Adobe PhotoShop.
7. Create a new document (choose ``New'' from the File menu). A dialog box will appear, offering you various options, including defining the size of the image and the resolution at which the illustration should be rasterized. Change the display of the width and height to use pixels, then add 10 pixels to each of the width and height values that show up in the dialog box. (This is important to allow anti-aliasing to work properly; otherwise, PhotoShop will crop the bitmap right up to the edges of the illustration, and the result will had odd artifacts at the edges of the logo.)
8. Issue the paste command (``Paste'' in the Edit menu). PhotoShop will ask if you want to paste anti-aliased. Unless you have a special application for which you know you don't want anti-aliasing, make sure to use ``Paste as Anti-aliased'' in this step.
9. Once PhotoShop finishes pasting the illustration, go to the Mode menu and select ``RGB''.
10. Now, go to the Mode menu again and select ``Indexed color...''. PhotoShop will ask you if you want to flatten the layers. Choose OK.
11. In the dialog box that comes up, regarding the number of colors to use, click OK. (It should offer Exact colors as default, with 65 or so colors.)
12. Now save the image using ``Save As...'' in the File menu. In the dialog box that comes up, select ``CompuServe GIF'' from the list for formats, and make sure to deselect all image previews (i.e., no Icon, no Thumbnail, no Full size).

Using an image manipulation program on a UNIX workstation. An alternative procedure is starting with a copy of an image at the largest size provided in the table above, then rescaling the image to a desired size, and finally applying a smoothing operation to the result. The easiest program to use for this purpose is xv on a Sun or SGI workstation. Simply bring up a GIF (or other format) version of the logo in xv, type the ``S'' (i.e., upper-case letter ``S'') key on your keyboard, then in the dialog box that comes up, supply a new desired size, and finally (after xv finishes resizing the image), type ``s'' (i.e., lower-case letter ``s'') to apply a smoothing operator to the result. You can now save the result.
Although this approach produces slightly inferior results to the first method, the results are usually acceptable and often very difficult to distinguish from the other method.

How the Different Formats of the Logo Were Created

For informational purposes, here is a summary of how the logo was created in the different formats shown in the table above:

GIF: CompuServe Graphics Interchange Format version 87a format, generated on an Apple Macintosh directly from the original Adobe Illustrator^® 6.0 drawings, using Adobe PhotoShop^® 3.0.5 and anti-aliasing to a white background. The background color is transparent. The images are not interlaced, because tests showed that interlacing produced worse looking results when the images were displayed by Netscape's Web browser.

EPSF Color: Encapsulated PostScript (EPSF 3.0) format, generated directly from the original Adobe Illustrator^® 6.0 drawings.

EPSF B/W: Encapsulated PostScript (EPSF 3.0) format, generated directly from the original Adobe Illustrator^® 6.0 drawings after making the following modifications. First, all blue areas in the original color illustration were changed to black, and second, the yellow-filled regions were changed to white. This approach resulted in superior print quality on monochrome or grayscale printers, so you should use this version of the logo when you expect that the print output device will not be a color printer.

TIFF: Tagged Image File Format, generated from the GIF images using the following sequence on a UNIX workstation:

    giftopnm logo-SIZE.gif | pnmtotiff -none > logo-SIZE.tiff

PPM: Portable Pixmap format, generated from the GIF images using the following sequence on a UNIX workstation:

    giftoppm logo-SIZE.gif > logo-SIZE.ppm

XPM: X11 Pixmap format version 3, generated from the GIF images using the following sequence on a UNIX workstation:

    giftoppm logo-SIZE.gif | ppmtoxpm > logo-SIZE.xpm

BMP: Microsoft Windows ``BMP'' format, generated from the GIF images using the following sequence on a UNIX workstation:

    giftoppm logo-SIZE.gif | ppmtobmp -windows > logo-SIZE.bmp

PCX: ZSoft ``PCX'' format, common on IBM-compatible PCs, generated from the GIF images using the following sequence on a UNIX workstation:

    giftoppm logo-SIZE.gif | ppmtopcx > logo-SIZE.pcx

PICT: Macintosh ``PICT'' graphics format, in Macbinary file format, generated from the GIF images using the following sequence on a UNIX workstation:

    giftoppm logo-SIZE.gif | ppmtopict > logo-SIZE.pict
    setenv MAC_FILETYPE "PICT"
    mcvert -vDd logo-SIZE.pict

(When download this file format to a Macintosh, make sure to set the file type in your FTP program to ``Macbinary''.)

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