Re: importing pixmaps
- To: mathgroup at yoda.physics.unc.edu
- Subject: Re: importing pixmaps
- From: Jeffrey Adams <jeff at tiag.com>
- Date: Fri, 1 Jul 94 09:54:22 -0400
> >L.S. > > > >Is it possible in mathematica to import pixmap files in e.g. pcx, > >tiff or gif format and do some image processing on them? > >I would also like to know if mathematica packages are available to > >do some simple image processing on pictures (FFT, scaling etc.). > > > >Rudolf Sprik > >sprik at phys.uva.nl > > > Off the top of my head, I don't know of packages that will do this. > However, you can import GIF format into the X front end and use > Convert to InputForm; perhaps, this would be a useful alternative. > > -John Each of the Mathematica front ends can copy and paste some image formats into and out of RasterArray and Raster formats. NeXTSTEP front ends can use TIFF, John reports X front ends can use GIF and I believe the Mac front ends can import and export PICTs. On the issue of importing and exporting images, I am wrapping up a NeXTSTEP MathLink package and code called Graphics`Tiff` which has two functions ReadTiff and WriteTiff which can read in TIFFs and create RasterArray objects and WriteTiff which can write RasterArray objects out as TIFF. These functions do not require a front end to work. They can read/write 1,2,4,8,24,32 bit GrayLevel, RBGColor, CMYKColor TIFFs. They currently throw out an Alpha channel. The MathLink application does contain NeXTSTEP specific code for reading in TIFFs, but the MathLink code is easily portable across different platforms so it shouldn't take to long to port. I'm also wrapping up a Graphics`Raster` package which contains useful common filters which act on RasterArray and Raster objects. Filters include Brighten, Contrast, GammaCorrection, Flat, Rotate, Inverse, RandomShift, Matrix, and a OneToOne filter for filtering discrete channel values. These filters will be able to work on All or individual channels in the image. Very soon I'll have them sent off to MathSource and let you know when they have been sent. Jeff Adams jeff at tiag.com NeXTMail accepted Told in a Garden.