Region iImage Comparison Fails by color depth

Attached the sample code to change the resolution and color depth , please let me know if you need any help in configuration. I tried it very long back in one of my projects so not tried it on the latest version.

function Test()
{
SetDisplay(800, 600, 32);
}

// The function changes the display settings:
// x - resolution
// y - resolution
// d - color depth
function SetDisplay(x, y, d)
{
var dm = Win32API.DEVMODE();
if(0 < Win32API.EnumDisplaySettings(0, -1, dm)) {
dm.dmPelsWidth = x;
dm.dmPelsHeight = y;
dm.dmBitsPerPel = d;

var res = Win32API.ChangeDisplaySettings(dm, 0);
if(res == DISP_CHANGE_BADMODE){
Log.Error("A call to the ChangeDisplaySettings() function failed in the " +
"SetDisplay() function.",
"The specified graphics mode (screen resolution: " + x + "*" +
y + "; color depth: " + d + " bits per pixel) is not supported.",
pmLower);
}
return res;
}
else {
var dwLastError = Win32API.GetLastError();
Log.Error("A call to the EnumDisplaySettings() failed in the " +
"SetDisplay() function.",
"System error code: " + dwLastError + " (" +
+ Utilities.SysErrorMessage(dwLastError) + ")", pmLower);
return -1;
}
}