QImage::QImage ( uchar. data, int width, int height, Format format ) Constructs an image width pixels wide, height pixels high with a format of format, that uses an existing memory buffer, data. The buffer must remain valid throughout the life of the QImage. The image does not delete the buffer at destruction. QImage:: QImage (uchar.data, int width, int height, QImage::Format format, QImageCleanupFunction cleanupFunction = nullptr, void.cleanupInfo = nullptr) Constructs an image with the given width, height and format, that uses an existing memory buffer, data.

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I have been trying to display a gray-scale image using Qt. The image data is loaded from a .txt file that contains 256x256 float data. There is no header involved for the image. I have tried the solution posted in this link

I used QLabel class to call setPixmap of my uchar* image_data_array. Even though I could get a Qt GUI window to open, but the window shows just blank screen.

imageLabel -> setPixmap(QPixmap::fromImage(*myImage));

How are you loading the QImage with the grey image data ?

QT doesn't have a greyscale image type, only a bilevel type. You can either create an RGB image with R=G=B=grey. Or more preferably use QImage::Format_Indexed8 and create a colour table where each entry has the same value as the index. i.e.

• Status:Closed
• Resolution: Out of scope
• Fix Version/s:Some future release
• Labels:

Currently, the only 8bit QImage is QImage::Format_Indexed8. With the right color table, it can be made to act like an 8bit grayscale. However, QPainter does not support drawing on a QImage of QImage::Format_Indexed8. Direct support for QImage::Format_Grayscale would allow for direct manipulation of a QImage that could be used as an alpha channel.