convert to immagine in RgB and manipulate

[montanaro]

Hi
i have to convert immagine jpg into Rgb and convert in grey.

Can you suggest?

[montanaro]

i can try with for but i dont understand the functions to use.

for example:

QPixmap pix(":/pathFile/NameFile.jpg"); //

//


for (int ii = 0; ii < pix.height(); ii++) {

for (int jj = 0; jj < pix.width(); jj++) {

// qGray(1,1,1);

}
}

Added after 1 41 minutes:

QImage immagine(":/PATH/IMMAGINE.jpg");
QRgb color;


for (int ii = 0; ii < immagine.height(); ii++) {

for (int jj = 0; jj < immagine.width(); jj++) {

color = immagine.pixel(ii,jj);
immagine.setPixel(ii,jj,QColor((qRed(color)*0.3) + qGreen(color)*0.59 + qBlue(color)*0.11).rgb());





}

[montanaro]

It returned:


QImage::pixel: coordinate (199,822) out of range

[Ginsengelf]

It returned:


QImage::pixel: coordinate (199,822) out of range

That's because the parameters for immagine.pixel() and setPixel() are in the wrong order.

Ginsengelf

[montanaro]

That's because the parameters for immagine.pixel() and setPixel() are in the wrong order.

Ginsengelf

yes. thank you.
i corrected.
but the code dont transform immage yet :(

[montanaro]

i solvede into Windows:

"
QSize sizeImage = immagine.size();
int width = sizeImage.width(), height = sizeImage.height();

QRgb color;



for (int f1=0; f1<width; f1++) {
for (int f2=0; f2<height; f2++) {
color = immagine.pixel(f1, f2);


// color= immagine.pixel(j,i);
// image.setPixel(f1, f2, QColor((qRed(color) + qGreen(color) + qBlue(color))/3).rgb());



int grigio= qGray(color);


immagine.setPixel(f1,f2, qRgb(grigio, grigio, grigio));
}
}"



but when i use qt on linux virtual machine, it dont run :(

virtual machine says: " conncection refused"


you can suggest ?

[montanaro]

i changed ip in qt option and now it runs :D

but now my duty is porting in QML :confused:

how i can? :O