How do I link a pngLib in VS2010

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C++

graphics

image

I want to load a png image into an array. I was told to download the CImg library.
The problem is that it uses the pngLib which I don't know how to link.
I downloaded some files from the libpng homepage, but adding the directory to additional include directories, the h files to the project and copying the zlib1.dll to the exe directory is not enough.

I get an error when I try to use the class:

myFloatImg (300,200);
string testFilename="testImage.png";
myFloatImg.load (filename.c_str());


the error:
c:\...\cimg.h(34670): error C3861: 'png_set_expand_gray_1_2_4_to_8': identifier not found

I guess it's a call to a function from pngLib
What should I do?
*openCV is not an option

Thanks!