Problem when saving bmp files

[cdlaweed]

Hi,

I have a QImage generated from a char* data array. When trying to save it to the bmp the file is correctly created but is not readeable by the window wiewer (paint open it but the data is crappy).

I guess that my QImage is not correctly initialised, but I don't find Where

Here is a part of my code:

// allocate the memory for the input picture
    unsigned char*   Orig_Image = NULL;
    QImage Image;
    Orig_Image = new unsigned char[Nb_Lines * Nb_Pixels];
    memset(Orig_Image, 0, Nb_Lines * Nb_Pixels);
 
    // create a B/W color table for the image
    QVector<QRgb> colorTable;
    for (int i = 0; i < 256; i++)
        colorTable.push_back(QColor(i, i, i).rgb());
 
 
.... edit the data array here
 
    Image = QImage(Orig_Image,Nb_Pixels,Nb_Lines,Nb_Pixels,QImage::Format_Indexed8);
Image.setColorTable(colorTable);
 
    if(!Image.isNull()) Image.save(QFileDialog::getSaveFileName(this, "Load a picture or file", QString(), "BMP"));
 
    delete(Orig_Image);

// allocate the memory for the input picture
    unsigned char*   Orig_Image = NULL;
    QImage Image;
    Orig_Image = new unsigned char[Nb_Lines * Nb_Pixels];
    memset(Orig_Image, 0, Nb_Lines * Nb_Pixels);

    // create a B/W color table for the image
    QVector<QRgb> colorTable;
    for (int i = 0; i < 256; i++)
        colorTable.push_back(QColor(i, i, i).rgb());


.... edit the data array here

    Image = QImage(Orig_Image,Nb_Pixels,Nb_Lines,Nb_Pixels,QImage::Format_Indexed8);
Image.setColorTable(colorTable);

    if(!Image.isNull()) Image.save(QFileDialog::getSaveFileName(this, "Load a picture or file", QString(), "BMP"));

    delete(Orig_Image);

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Any clues are appreciated!

[Rhayader]

from the qt docs http://doc.qt.nokia.com/4.7-snapshot/qimage.html
"Warning: Painting on a QImage with the format QImage::Format_Indexed8 is not supported."

[cdlaweed]

hum ok... so there is no possibilities to save a 8bits bmp picture with Qt?

[cdlaweed]

It is strange because on the doc it is also written:
BMP Windows Bitmap Read/write

if there is no solution on Qt is it possible whit another library?