how to change the colors for a geoimage files

[new]

Hello,

Can any one tell me how to add the colors to greyscale geotiff files?
Can anyone tell me how to convert geotiff to shp?

Thanks,

Zitian

[anthony]

What do you mean by 'add colors'?

[new]

(1) I have a gray radar image and I want to change the gray image to color image, based on my own color table. I also want to change some part of color when snow is reported on some piexls (I have mask info for snow).

(2) Is it possible to convert geotiff file to shp files using imagemagic?

Thank you very much for your help.

Zitian

[anthony]

(1) I have a gray radar image and I want to change the gray image to color image, based on my own color table. I also want to change some part of color when snow is reported on some piexls (I have mask info for snow).

YES, IM can do this, in fact a operator was added a few months ago.
http://imagemagick.org/Usage/color/#clut

NOTE: the first example here is the old DIY method. The fast way to do this is
to use the -clut operator ,which is also demonstrated.

(2) Is it possible to convert geotiff file to shp files using imagemagic?

Sorry, it isn't listed as an known format. However it is probably a variation of an existing image format. If you provide an example on the IM Bugs forum it withh likely be added for the next release of IM (generally weekly).

[new]

Thanks you very much.

I got color tiff images mow. However, my geotiif becomes tiff. We do need color geotiff. We hope the output-geotiff could be available in next release.

Zitian

[anthony]

Make a request with an example and what a geotiff is in the developers forum.
Though cristy may not have time before the next release.