Had this in my drafts folder for quite some time, and now, finally, I had a free minute to edit it and sent it off:
Am Montag, 27. Februar 2006 01:02 schrieb Anthony Thyssen: > | When viewing B&W images (1bit depth) with "display -scale ...", how do I > | enable antialiasing? > > Well anti-aliasing does not work on bitmap images. That's a misunderstanding. We're only interested in antialiasing when shrinking the image, and, obviously, this is also possible with bitmap images. In fact many image viewers do this when displaying scaled images. I'm not interested in removing jagged edges in the original image at full size. > Anti-aliasing involves using a mix of colors and transparences to try > and smooth the 'stair case' or 'jaggies' effect of slanted lines and > color boundaries. If only two colors are available no anti-aliasing can > NOT happen! Although the original image may only have two colors, a viewer may add more colors temporarily for display and AA, and many viewers do just that. > The image must be converted from B&W or grey scale at the minimum before > anti-aliasing can be used. I assume that you're only > A simple way to smooth edges is to use a small amount of blur > after reading in a B&W image or an image with a tiny pallette size. > > EG: convert image.xbm -blur 0x.3 smoothed_image.png Well this is a method for adding AA to an image later on without scaling it. Personally, I almost never have applied similar methods because of the tradeoff: One looses sharpness. If I want to have AA, then either I use a software that can create AA'ed images right out of the box, or I create the image at a much larger size than needed and later smoothly downsize it. But my original inquiry was only about *viewing* high res images on a low res screen, not about altering these images permanently. > For more info on anti-aliasing see.. > http://www.cit.gu.edu.au/~anthony/graphics/imagick6/antialiasing/ Nice site! -- Dipl.-Phys. Felix E. Klee Email: [EMAIL PROTECTED] (work), [EMAIL PROTECTED] (home) Tel: +49 721 8307937, Fax: +49 721 8307936 Linuxburg, Goethestr. 15a, 76135 Karlsruhe, Germany _______________________________________________ Magick-users mailing list [email protected] http://studio.imagemagick.org/mailman/listinfo/magick-users
