pdelta - compute 1976 CIE Lab deltaE* between two Radiance pictures
pdelta image1.hdr image2.hdr
pdelta calculates the color difference deltaE* between two HDR images. The operation takes place in 1976 CIE Lab color space. The result is an HDR image which is sent to STDOUT.
To calculate the deltaE* Lab color difference between two HDR images and store the result in output.hdr
pdelta image1.hdr image2.hdr > output.hdr