Image enhancer tool?

in Mac Software edited January 2014
I am currently working on dark forces mod for Half life 2. I would like to use the textures from the orignal gamehowever that they are so low quality that whan enlarged, they look horrid in HL2. Is there any tool that would be able to take the current low quality images and enhance them to useable sizes. Something that would increase the number of pixils in the image so that when they are expanded they look slightly less stupid, i still want a slightly pixilated feal but not to its current degree.

I have photoshop. Please tell me if im being really stupid and all i have to do i change and option when exporting from photoshop.

if you cant do this in photoshop, what tool would i uses to inhance these images.
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