Carl Karsten on wrote... | I have a bunch of .pbm files that are scans of blueprints. the scans are big - | they create 1.4gig temp file when I work with them. so I want to shrink them, | but I keep 'loosing detail' like whole walls. | | I think the problem is the thin black lines - if there is any trace of a line, I | need there to be a line in the output. | | I see this list of resize filters: | | Point | Box | Triangle | Hermite | Hanning | Hamming | Blackman | Gaussian | Quadratic | Cubic | Catrom | Mitchell | Lanczos | Bessel | Sinc | I have just completed (a month ago) an overhaul of the resize filters in IM. There are lots more filters now and even a few bug fixes and more expert level controls to the filters in the latest releases.
For full information and documentation of the filters (without going too deeply into fourier transforms and fequency analysis) see IM Examples Resize Pages, whcih took me long to do that the actual overhaul!!! IM Example, Resizing Images and Filters http://imagemagick.org/Usage/resize/ However filters will not help you in resizing line drawings such as you describe! the problem is that for large scale minifications, thin lines disappear!!!! This is documented in a rough notes in... http://imagemagick.org/Usage/resize/#thin_lines Currently no one has looking into or reported practical solutions to the problem, other than doing it in stages and adjusting contrast at each step (an example of this is also needed). If you (or anyone else) comes up for locates (google) with a solution (partial or specialized), then please mail me, so I can include it in the above. Anthony Thyssen ( Graphics Enthusiast ) <[EMAIL PROTECTED]> ----------------------------------------------------------------------------- At 300 dpi you can tell she's wearing a swimsuit. At 600 dpi you can tell it's wet. At 1200 dpi you can tell it's painted on. I suppose at 2400 dpi you can tell if the paint is giving her a rash. -- Joshua R. Poulson ----------------------------------------------------------------------------- IM Examples http://www.imagemagick.org/Usage/ _______________________________________________ Magick-users mailing list [email protected] http://studio.imagemagick.org/mailman/listinfo/magick-users
