IMG_SCALE Name
IMG_SCALE Purpose
Scale given image for display.
Category
Calling Sequence
out = img_scale(in,sc,par) Inputs
in = Input image (2-d or 3-d). in
sc = scaling option (0 to n). in
0: No scaling.
1: Scale to image min/max: bytscl(img).
2: Scale to specified min/max: scalearray(v,mn,mx)
3: Percentile scaling: ls(img,lo,hi)
4: Variance scaling: bytscl(varf(img,wid)<thresh)
5: Unsharp masking: ls(img-wt*smooth(img,wid),lo,hi)
6: Interactive scaling. BYT, INT, UNIT images only.
7: Apply scaling from last interactive.
par = Parameter structure. in
Depends on scaling option (values shown are defaults):
0: Not used.
1: Not used.
2: {min:min, max:max}
3: {lo:min, hi:max, nbins:2000, quiet:0}
4: {width:3, thresh:100}
5: {wt:0.5, width:5, lo:1, hi:1, nbins:2000, quiet:0}
6: Returned with scaling info.
7: Send returned structure from option 6.
Keyword Parameters
Keywords
ERROR=err Error flag: 0=ok. Outputs
Common Blocks
Notes
Note: make sure the correct tag names are used in the
par structure, no checking is done. Any or all missing
parameter values are defaulted.
Also note that color images are split into Hue, Saturation,
and Value. Scaling is applied to Value which ranges from
0 to 1. So use values appropriate for that range.
Modification History
R. Sterner, 2003 Jul 08
R. Sterner, 2003 Sep 23 --- Added error flag. Also fixed opt 7.
Copyright (C) 2003, Johns Hopkins University/Applied Physics Laboratory
This software may be used, copied, or redistributed as long as it is not
sold and this copyright notice is reproduced on each copy made. This
routine is provided as is without any express or implied warranties
whatsoever. Other limitations apply as described in the file disclaimer.txt.