[GRASS-dev] r.what.color questions
glynn at gclements.plus.com
Wed May 9 08:22:33 EDT 2007
> WRT the r.what.color module.
> #### it should use map= and not input=
> #### can it protect against malformed format strings like:
> Segmentation fault (and/or memory exposure)
Only by changing format= to use a list of built-in formats; analysing
a format string isn't practical.
Which formats are desired?
AFAICT, the main options are:
1. Decimal 0-255, hex 00-ff (upper-case?), float 0.0-1.0 (but how many
2. Separator: none, comma, colon (others?)
3. R/G/B vs B/G/R.
> #### any call for a -s flag to scale color values from 0.0-1.0?
> [PostScript, Matlab] (-1 and -o are both bad chars for flags)
That can be incorporated into the previous format= change. Otherwise,
the format string will need to use %f instead of %u/%x.
> #### can it format output like:
> instead of
> cat: <fmt>
> ? (too many ":")
> 1000: 0:255:0
I can add a separator= option.
> #### any comment WRT wish #382 ?
> it would be nice (eg for vector maps) to have something like r.colors
> color=,rules= where you could pass r.what.color a FP value= and some
> color rules and have it output value|RRR:GGG:BBB for insertion into
> a vector's table with Markus's proposed v.colors script. (for use with
> modules that use GRASS_RGB column to get color)
Glynn Clements <glynn at gclements.plus.com>
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