mcdonald@fornax.UUCP (Ken Mcdonald) (02/22/89)
I have some pictures scanned with AppleScan, that I want to convert to 256
grey levels. Unfortunately, AppleScan only seems to support 16 grey levels,
so what I've done is scan the pictures at very high res, and now I want to
reduce the res, and in the process smooth the greys out. Any ideas?
Thanks for the help,
Ken McDonald
{...!ubc-cs!mcdonald@fornax.uucp}tow@arisia.Xerox.COM (Rob Tow) (02/24/89)
In article <894@fornax.UUCP> mcdonald@fornax.UUCP (Ken Mcdonald) writes: >I have some pictures scanned with AppleScan, that I want to convert to 256 >grey levels. Unfortunately, AppleScan only seems to support 16 grey levels, >so what I've done is scan the pictures at very high res, and now I want to >reduce the res, and in the process smooth the greys out. Any ideas? > >Thanks for the help, >Ken McDonald >{...!ubc-cs!mcdonald@fornax.uucp} I suggest reading the file into Silicon Beach's "Digital Darkroom", and playing around with the histogram. Digital Darkroom supports loadable code resources for image acquisition and for image processing filters - it is a breeze to write your own filters in Lightspeed C and do whatever custom twiddles you want. I've used this to add Fourier, Walsh, and Haar transforms to the program, and to add image acquisition maodules that read the formats we use for color pixelmaps here at PARC. If you have LSC, you may easily write a nonlinear reduction/smoothing module that would nicely do what you want. --- Rob Tow Member Research Staff Electronic Document Lab Xerox PARC 3333 Coyote Hill Drive Palo Alto, CA 94304 (415)-494-4807