How to correct the Image?

[Rohith]

Hi i am trying to convert an image in to BMP and then i want to print it, but when i am converting the image to BMP using QImage the image seems as follows

Please help me to convert the Image to a good quality

Thanks in advance

[khakhil]

hey
i am getting your problem completely but related your issue i found something here.
https://www.kdab.com/qt-on-android-how-to-convert-qt-images-to-android-images-and-vice-versa/

http://stackoverflow.com/questions/31137830/display-image-from-raw-bitmap-file-to-bmp-file

[VRonin]

Could you provide an example image and how it gets out using your method?

[kshegunov]

@Rohith
The forum's image upload is broken, please use an external site (e.g. postimage.org).

[Rohith]

@kshegunov

Here is the Link of Image Please Go through It

https://s12.postimg.org/npwtmfvml/finalimage.jpg

[kshegunov]

@Rohith
It looks strange. How do you make the conversion? And what did you mean by "print', do you want to send the image to a printer, or only to show it on the screen?

[Rohith]

@kshegunov

I want to send the image to the printer for printing

here is code

QImage img("1.jpg");
                QImage img1 = img.scaled(QSize(384,500), Qt::IgnoreAspectRatio);
        QBitmap *prnbmp1 = new QBitmap(QBitmap::fromImage((const QImage)img1,Qt::MonoOnly));
           prnbmp1->save("finalimage.bmp","BMP",-1);
       
        QImage img2("finalimage.bmp" );
        img2.save("finalimage.bmp");
        QFile file1("finalimage.bmp");
        qDebug()<<"size of img in bytes"<<file1.size();

after converting to Bmp i am sending to printer by converting the BMP to HEX

here is the Link for Original Image

https://s10.postimg.org/lj1v7ddy1/image.jpg

Thanks in advance

[VRonin]

form http://doc.qt.io/qt-5/qimage.html

Qt provides four classes for handling image data: QImage, QPixmap, QBitmap and QPicture. QImage is designed and optimized for I/O, and for direct pixel access and manipulation, while QPixmap is designed and optimized for showing images on screen. QBitmap is only a convenience class that inherits QPixmap, ensuring a depth of 1. Finally, the QPicture class is a paint device that records and replays QPainter commands.

QImage img("1.jpg");
QImage img1 = img.scaled(QSize(384,500), Qt::IgnoreAspectRatio);
img1.convertToFormat(QImage::Format_Mono); //Converts to black and white but original image is already B/W so I'm not sure it's necessary
img1.save("finalimage.bmp","BMP");

[kshegunov]

You don't need all this. Just write the image to the file with the appropriate format. E.g:

QImage img = QImage("1.jpg").scaled(QSize(384,500), Qt::IgnoreAspectRatio);
if (!img.save("finalimage.bmp", "BMP"))
    ; //< Couldn't save the image, handle the error

Look here for the supported formats.

Kind regards.