GretagMacbeth color chart shot on a Digital Rebel under tungsten light at ISO 100 with the histogram exposed less than 1/3 stop from the right. Each large square represents the ideal result for that patch (the color of that square on the source card in sRGB color space). Each large square contains two smaller inset squares in the top left and top right corners. The top left inset square represents the results obtain through raw conversion using ACR (Adobe Camera Raw) 2.3 via Tom Fors' ACR-Calibrator script. The top right inset square represents the result achived from C1 using the 300D profile with C1's auto white balance and auto exposure.