[R] recovering value of scalar from false color map and image

I have a JPEG map of temperature data, coded using a given legend where blues are cooler and reds hotter. Is there any preexisting R magic or package which might let me recover the value of the scalar quantity so represented given the RGB values at each point in the picture? After processing,

Re: [R] recovering value of scalar from false color map and image

2008/10/18 Jan Theodore Galkowski [EMAIL PROTECTED]: I have a JPEG map of temperature data, coded using a given legend where blues are cooler and reds hotter. Is there any preexisting R magic or package which might let me recover the value of the scalar quantity so represented given the RGB