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I have a gray scale tiff image. I can extract the values from this tiff using numpy and make a new image with blue scale. But how can I convert it to shades of blue instead of shades of gray directly from the Tiff? Is it even possible?

Edit: Well I have two sets of tiff images(data), one with color-palette and another with gray scale ,I could generate tiles from color-palette one using generate_tiles.py, and show them on a map, but with gray scale one I can't do that, so I am wondering if I could change this gray scale tiff to color-palette one (with custom colours) so I can generate tiles and visualize the data.

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    It might help if you can show what you've already done / tried, what worked and what didn't work. – BradHards Mar 28 '14 at 10:44
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It depends what you want exactly.

1) most GIS software will allow you to change the symbology of a one band raster in order to display it in scales of blue. In some cases you can can store a colormap with your image, but this implies some kind of discretization.

2) If you want a 'true' colored image, you need to create a three band RGB (red/green/blue). Therefore, stack two constant raster of zero value with your gray scale image (zeros/zeros/gray_scale). you can do this with gdalbuildvrt -separate (create vrt with 3 bands), then gdal_translate (vrt to tif). Note that this will increase the size of your image, and is thus rarely the best solution.

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