Hi,

I need to convert a 8bpp gray DIB image to a QImage or QPixmap.

I had been trying multiple ways but it seems to not work.

This is the code:
Qt Code: 
  1. int iWidth = pDib->Width();
  2. int iHeight = pDib->Height();
  3. int iBytes = iWidth*iHeight;
  4. uchar* uData = new uchar[iWidth*iHeight];
  5. strncpy((char*)uData,(char*)pDib->GetLinePtr(0),iBytes);
  6. QImage* image = new QImage(uData,iWidth,iHeight,QImage::Format_Indexed8);
  7. image->setNumColors(256);
  8. image->setColorTable(m_qPalette);
  9.  
  10. bool bSave = pImage->save("image.jpg","JPG");     //Returns true, but the image is all gray
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This other code takes care that the QImage have to be 32 bit aligned:
Qt Code: 
  1. int iWidth = pDib->Width();
  2. int iHeight = pDib->Height();
  3. int iBytes = iWidth*iHeight;
  4. uchar* uData = new uchar[iWidth*iHeight];
  5. int iColumnsAdd = (iWidth % 4);
  6. QImage* qImatge = new QImage(iWidth+iColumnsAdd ,iHeight,QImage::Format_Indexed8);
  7. uchar* uData2 = qImatge->bits();
  8. int iOriginalLineStart;
  9. int iDestLineStart;
  10. for (int i=0; i<iHeight; i++)
  11. {
  12.     iOriginalLineStart = i*iWidth;
  13.     iDestLineStart = ((i*iWidth) + (i*iColumnsAdd));
  14.     memcpy(uData2+iDestLineStart,uData+iOriginalLineStart,iWidth);
  15. }
  16. qImatge->setNumColors(256);
  17. qImatge->setColorTable(m_qPalette);
  18. return(qImatge);
  19.  
  20. bool bSave = pImage->save("image.jpg","JPG");     //Returns true, but the image is all gray
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Thanks,