mlm@nl.cs.cmu.edu (Michael L. Mauldin) (02/19/89)
In article <634@rpi.edu>, mcintyre@turing.cs.rpi.edu (David McIntyre) writes: > > I am about to start programming conversion utilities between: > GIF, TIFF, Sun Rasterfile, Pbm > > Before I start doing this, has someone already produced public domain > sources for these tasks? Yes (well, mostly). The alpha test release of the FBM package is now avilable by anonymous FTP (see the end of the message). ************************************************************************ * Announcing the "Fuzzy BitMap" (or FBM) image manipulation library * ************************************************************************ The FBM library is now available in Alpha test form to interested parties. This package allows manipulation and conversion of a variety of color and black-and-white image formats. Philosophy Each program can read any of the understood formats, and can write any of the understood formats that make sense for the image data. Programs are designed around specific image operations (sizing, scaling, retoning, halftoning, quantizing, etc.), rather than simply converting from one format to another. For example, converting a 4bit color GIF file to a 1bit Sun rasterfile takes the following operations: read GIF format map color values to greyscale adjust aspect ratio (1.2 --> 1.0) scale image up to be visible (320x200 --> 640x480 or 1152x864) optionally sharpen the image (edge enhancement) optionally clean up "snow" in image (flip isolated pixels) halftone (Blue noise, Floyd-Steinberg, Jarvis, Threshhold) write Sun rasterfile format. So there equivalent pipeline of fbm routines would be: clr2gray < foo.gif | fbnorm | fbext [ args ] | fbhalf [args] > foo.1bit That way you have maximum control over the resulting image size and quality. Inputs the following file formats o Sun rasterfiles (1, 8, or 24 bits, color or greyscale) o GIF files (1 to 8 bits, color or greyscale) o PCX files o PBM rasters o Face files (CMU format for 1bit files by Bennet Yee) o FBM files (my own format) (automatically determines input format, and uncompresses files compressed using 'compress') Outputs the following formats o Sun rasterfiles o FBM files o PBM (1bit files only) o Face format (1bit files only) With input converter for o raw images (like Amiga Digi-View files) With output converters for o PostScript (1bit or 8bit greyscale files only) o Diablo graphics (1bit files only) Operations o Extract rectangle (optionally resizing and changing aspect ratio) o Change density and contrast (color and greyscale) o Rotate 90, 180, or 270 degrees o Quantize 24 bit RGB images to 8..256 colors Modified Heckbert median cut o Halftone greyscale using Ulichney's Blue Noise dithering Floyd-Steinberg dithering Jarvis's Constrained averaging Threshholding o Edge Sharpening by Digitial Laplacian (color or greyscale) o Convert color to greyscale (or compute "grey" colormap so greyscale images can be viewed on frame buffers) o Compute histograms of greyscale images o Sample 1bit images to convert to greyscale Status Alpha test release. "Use at your own risk, bug fixes not guaranteed, be happy with minimal documentation." Freely available for use, redistribution, incorporation into other code. Just don't make a profit off it or take my name off of it. Written in C for BSD and Mach Unix Systems. Tested on Vaxes, Sun Workstations, and IBM RTs. Self contained. Does not require Sun include files or library routines to manipulate Sun rasters. Availability Anonymous FTP Host: nl.cs.cmu.edu (128.2.222.56) User: anonymous Password: name@site Directory: /usr/mlm/ftp/ Filename: fbm08.tar.Z Will be posted to UseNet when the code is stable and the documentation is complete and accurate. Acknowledgements GIF read support written by David Koblas. Edge detection and pixel cleaning by Gary Sherwin and Michael Mauldin Rumours Future support is rumoured for Amiga IFF files and NeXT TIFF files. MacPaint files may be supported when I can find a good spec for the format. Also it may someday be able to write all of the formats that it can read. All that is needed to incorporate a new format is to write a routine that reads the given image into memory and one that writes it out again. I will incorporate other code on a "whenever I'm not working on my thesis" basis. -- Michael L. Mauldin (Fuzzy) School of Computer Science ARPA: Michael.Mauldin@NL.CS.CMU.EDU Carnegie Mellon University Phone: (412) 268-3065 Pittsburgh, PA 15213-3890 --