Ku-Yaw ChangKu-Yaw Changcanseco@mail.dyu.edu.twcanseco@mail.dyu.edu.tw

Assistant Professor, Department of Assistant Professor, Department of Computer Science and Information EngineeringComputer Science and Information Engineering

Da-Yeh UniversityDa-Yeh University

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OutlineOutline

IntroductionIntroduction

Add to Your ProjectAdd to Your Project

Load a JPEG fileLoad a JPEG file

Image PreparationImage Preparation

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IntroductionIntroduction

FreeImageFreeImage an Open Source library project an Open Source library project support popular graphics image formatssupport popular graphics image formats

PNG, BMP, JPEG, TIFF and others PNG, BMP, JPEG, TIFF and others two versions are availabletwo versions are available

a binary distribution a binary distribution

a source distributiona source distribution

WebsiteWebsite http://freeimage.sourceforge.net/http://freeimage.sourceforge.net/

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IntroductionIntroduction

FeaturesFeatures Ease of use.Ease of use.

The library has been designed to be extremely The library has been designed to be extremely simple in use. simple in use.

Our motto is: make difficult things simple instead of Our motto is: make difficult things simple instead of simple things difficult.simple things difficult.

Supports many formatsSupports many formatsBMP, JPEG, TIFF, PNG BMP, JPEG, TIFF, PNG

Etc…Etc…

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IntroductionIntroduction

Latest versionLatest version May 7th 2005 : FreeImage 3.7.0 releasedMay 7th 2005 : FreeImage 3.7.0 released

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Adding to Your ProjectAdding to Your Project

FreeImageFreeImage FreeImage.hFreeImage.h

Add to your projectAdd to your project FreeImage.libFreeImage.lib

Add to your projectAdd to your project FreeImage.dllFreeImage.dll

Under the same directory with your executable fileUnder the same directory with your executable file

Under the system directoryUnder the system directory C:\Windows\System32C:\Windows\System32

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Load a JPEG fileLoad a JPEG file

C***DocC***Doc #include “FreeImage.h”#include “FreeImage.h” OverrideOverride

BOOL C***Doc::OnOpenDocumentBOOL C***Doc::OnOpenDocument(LPCTSTR lpszPathName)(LPCTSTR lpszPathName)

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Load a JPEG fileLoad a JPEG file

Load and UnLoadLoad and UnLoad FIBITMAP * dib = FIBITMAP * dib =

FreeImage_Load(FIF_JPEG, lpszPathName, FreeImage_Load(FIF_JPEG, lpszPathName, JPEG_ACCURATE);JPEG_ACCURATE);

FreeImage_Unload(dib);FreeImage_Unload(dib);

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Get Image InformationGet Image Information WidthWidth

FreeImage_GetWidth(dib);FreeImage_GetWidth(dib); HeightHeight

FreeImage_GetHeight(dib);FreeImage_GetHeight(dib); Size of one pixel in bitsSize of one pixel in bits

FreeImage_GetBPP(dib);FreeImage_GetBPP(dib);

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Load a JPEG fileLoad a JPEG file

Access pixelsAccess pixels unsigned char * pScanLine = unsigned char * pScanLine =

FreeImage_GetScanLine(dib, nLine);FreeImage_GetScanLine(dib, nLine);

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for (int iLoop=0; iLoop<m_nHeight; iLoop++)for (int iLoop=0; iLoop<m_nHeight; iLoop++) {{

unsigned char * pScanLine = FreeImage_GetScanLine(dib, unsigned char * pScanLine = FreeImage_GetScanLine(dib,

(m_nHeight-1) - iLoop);(m_nHeight-1) - iLoop);

for (int jLoop=0; jLoop<m_nWidth; jLoop++)for (int jLoop=0; jLoop<m_nWidth; jLoop++) {{

*(m_pBImage+iLoop*m_nWidth+jLoop) = *(pScanLine+jLoop*3);*(m_pBImage+iLoop*m_nWidth+jLoop) = *(pScanLine+jLoop*3);

*(m_pGImage+iLoop*m_nWidth+jLoop) = *(pScanLine+jLoop*3+1);*(m_pGImage+iLoop*m_nWidth+jLoop) = *(pScanLine+jLoop*3+1);

*(m_pRImage+iLoop*m_nWidth+jLoop) = *(pScanLine+jLoop*3+2);*(m_pRImage+iLoop*m_nWidth+jLoop) = *(pScanLine+jLoop*3+2);

}}

}}

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PreparationPreparation

ImageImage Format: JPGFormat: JPG Size: 600*300Size: 600*300 Content: PlateContent: Plate