QImage conversion from 8 bit images to QImage::Format_Grayscale16

[SachinBhat]

Hi,

I wanted to convert input 8 bit images to QImage::Format_Grayscale16.

Here is the below code snippet
QImage qimg("D:\image.png");
QImage qimg24;

qimg24 = qimg.convertToFormat(QImage::Format_Grayscale16);

The input image is a 24 bit RGB888 png image.

I get segmebntation fault if i run this. Wont the converttoformat convert it to grayscale8 and upscale the input image to 16 bit?

Thanks
Sachin

[Pablo J. Rogina]

@SachinBhat said in QImage conversion from 8 bit images to QImage::Format_Grayscale16:

I get segmebntation fault if i run this

please provide the stack trace

[KroMignon]

@SachinBhat said in QImage conversion from 8 bit images to QImage::Format_Grayscale16:

QImage qimg("D:\image.png");
QImage qimg24;
qimg24 = qimg.convertToFormat(QImage::Format_Grayscale16);

You have to check first if image loading was successful:

QImage qimg("D:\\image.png");
QImage qimg24;

if(!img.isNull())
{
    qimg24 = qimg.convertToFormat(QImage::Format_Grayscale16);
}
else
{
    qDebug() << "Failed to load image!";
}

[mvuori]

I'd say your source image is nul because of :. Use double backslash ot forward slash.