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Color mapping texture pixel values

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I am looking to alter the way my images are displayed by putting a clamp on the color values. By that I mean cause all pixel values below the lower clamp to display as 0.0, all pixel values above the upper clamp to display as 1.0, and all values between the clamps be linearly mapped from 0.0 to 1.0. Previously I was displaying my image using glDrawPixels and solving the clamping problem by using glPixelMap and creating a color map that specified the desired values. However, I am now using textures to display my image and glPixelMap doesn't work. How can I solve this problem? Oh, and I can't alter the image data.

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