BOOL PngFileOpenDlg (HWND hwnd, PTSTR pstrFileName, PTSTR pstrTitleName) ;
BOOL PngFileSaveDlg (HWND hwnd, PTSTR pstrFileName, PTSTR pstrTitleName) ;
-BOOL PngLoadImage (PTSTR pstrFileName, png_byte **ppbImageData,
+BOOL PngLoadImage (PTSTR pstrFileName, png_byte **ppbImageData,
int *piWidth, int *piHeight, int *piChannels, png_color *pBkgColor);
BOOL PngSaveImage (PTSTR pstrFileName, png_byte *pDiData,
int iWidth, int iHeight, png_color BkgColor);