[gdal-dev] display picture in colorful mode

[weixj2003ld]

Hi,
I open two files,and they have the same bands number(that is ,6),one is .img ,the other is .tif.Now,I find that the .img file is almost red,and the .tif file is grey.
I want to display it in colorful, for example,grass is green,water is blue,etc.What should I do with GDAL?
Kind regards.
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