Problem with loading an Image from raw data

[Dark Harlekin]

Hi everybody,

I'm trying to load an image from raw data, which I get from a database.
For testing purpose I saved the data to a file and wrote the code below but it won't display the image.
I'm not that into processing images, maybe I'm missing something else.

the raw image (https://1drv.ms/u/s!AhdzagALuaiZkizEwRBwrHcOpXjO)
an exported version of the image (https://1drv.ms/i/s!AhdzagALuaiZki3EGiwbTUCAMU87)


QByteArray imagesData;
QFile *file = new QFile(QFileDialog::getOpenFileName(this,tr("Open Image"), "", tr("")));

if(file->exists())
{
//get byteArray from raw data file
file->open(QFile::ReadOnly);
imagesData = file->readAll();
file->close();

//Create qimage
QImage img((const uchar*)imagesData.data(),4320,2880,QImage::Format_ RGB888);

QPixmap pix;
pix.fromImage(img);

ui->label->setPixmap(pix);
}

thanks :)

[anda_skoa]

Well, you are setting an null pixmap on the label, so it will by definition be empty.

You probably didn't see the "static" keyword in the signature of QPixmap::fromImage()

Cheers,
_

[Dark Harlekin]

I did miss that one out but it is still not working, seems like this isn't correct.

QImage img((const uchar*)imagesData.data(),4320,2880,QImage::Format_ RGB888);

[d_stranz]

So why aren't you simply calling QPixmap::load() or QPixmap::loadFromData() instead of going through this circuitous route of reading the data, creating a QImage and then converting that to a pixmap?

[Dark Harlekin]

What I get from the database is a raw dump without a header, so I can't use QPixmap::load() or QPixmap::loadFromData().
The file is avaible in the first post, maybe I'm missing something again.

[d_stranz]

Are you certain that the raw dump from the database doesn't contain header information? It would seem odd to store an image as a blob but only after stripping off the header. And are you sure the image dimensions are correct? A 4320 x 2880 pixel image with one byte per color channel should be around 37 MB. The rawImage file you posted is only 4 MB.

[Dark Harlekin]

You are right, the filesize doesn't really fit and I tried to load the raw file but it didn't work.
I really have no idear, it seems like its the jpg file without a header but as I said I'm really not into grafiks.

[Lesiok]

Or ask the author of these images.