CXIMAGE를 사용하면 BMP를 JPG로 저장할 수 있다.

#include "./cximage/cximage/ximage.h"
#pragma comment(lib,"./cximage/cximage/CxImageDLL/Debug/cximagecrtd.lib")
//#pragma comment(lib,"./cximage/cximage/Debug/cximage.lib")

CxImage* newImage = new CxImage();
newImage->Load(file_bmp, CXIMAGE_FORMAT_BMP);

BOOL bRet;
if (newImage->IsValid()){
newImage->Save(path,CXIMAGE_FORMAT_JPG);
}

delete newImage;
newImage = NULL;