mirror of https://github.com/GNOME/gimp.git
7e4a76203a
* updated refract and warp plugins * changed the INSTALL file to reflect the fact that gtk is a separate package * app/text_tool.c: small patch for indexed images and antialiased toggle -Yosh |
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| INSTALL | ||
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| README | ||
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| refguts.c | ||
| refmain.c | ||
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README
refract: A plug-in for the GIMP 0.99 by Kevin Turner <kevint@poboxes.com> http://www.poboxes.com/kevint/gimp/refract.html Refract distorts an image by passing it through the lens. The side of the lens towards the image is flat, the shape the other side is determined by a height map; a grayscale image where white pixels are high, black pixels are low, and anything between is somewhere inbetween. (Refract will accept an RGB image as a lens map, but will only use the first channel.) The thickness of the lens is determined by the "Thickness" paramater. The "Distance" parameter is the distance between the bottom of the lens and the image. (The distance between the observer and the image is fixed at somewhere around infinity minus one. Fortunately, there are no perspective effects.) The two indicies of refraction describe what substances you're looking through. Index A is for the substance between you and the lens, index B is that of the material the lens is crafted from. So when looking from air in to water, index A would be about 1 and index B is 1.333. These indicies are physical constants and can be obtained by looking in your copy of the CRC, or using the samples provided. The X and Y offsets move the position of the lens. Sorry, a preview image is on the TO DO list, but it ain't here yet. The resulting image can be placed on a new layer by checking the "New layer" checkbox. Read the code and the aformentioned web page for more information. Questions, comments, reservations, and bug reports are always welcome. * * * I'm not a very expirenced C programmer, so questions, comments, and reservations on code and style are more than welcome. This plug-in was developed on Linux and I will be the first to admit that I'm rather inexpirenced (okay, ignorant) with other operating systems. If I do wrong, educate me. Credits: Pixel fetcher routines are from Quartic's whirlpinch plug-in. Thanks, Quartic[1]! 1: Quartic, AKA Federico Mena-Quintero federico@nuclecu.unam.mx http://www.nuclecu.unam.mx/~federico