qimage

问题 Im trying to convert a QImage that maked from ScreenShot to a QByteArray for sending via QTCPSocket. when i convert QImage to QByteArray and before sending it i try to deserialize and show it on label it cant ! what's my mistake? thx for helping. QByteArray ImClientShooter::toQByteArray(QImage &img) { QByteArray temp; QDataStream data(&temp, QIODevice::ReadWrite); data « img; return temp; } QByteArray goOn{toQByteArray(sampleQImage)}; //sampleQImage is a QImage Object lbl->setPixmap(QPixmap:

问题 Trying to copy part of an image as a polygon (specifically a pentagon) but im more interested in how to copy as anything but a rectangle. The following code only allows to copy as a rectangle. QImage copy(const QRect &rect = QRect()) const; inline QImage copy(int x, int y, int w, int h) const { return copy(QRect(x, y, w, h)); } void SelectionInstrument::copyImage(ImageArea &imageArea) { if (mIsSelectionExists) { imageArea.setImage(mImageCopy); QClipboard *globalClipboard = QApplication:

问题 Trying to copy part of an image as a polygon (specifically a pentagon) but im more interested in how to copy as anything but a rectangle. The following code only allows to copy as a rectangle. QImage copy(const QRect &rect = QRect()) const; inline QImage copy(int x, int y, int w, int h) const { return copy(QRect(x, y, w, h)); } void SelectionInstrument::copyImage(ImageArea &imageArea) { if (mIsSelectionExists) { imageArea.setImage(mImageCopy); QClipboard *globalClipboard = QApplication:

问题 I have a 2D numpy array of type np.float64, and I want to show it as an image in a QLabel (or any other valid way): self.img = np.rot90(get_my_data()) # this line returns a 2D numpy array of type np.float64 self.qimg = QtGui.QImage(self.img, self.img.shape[0], self.img.shape[1], QtGui.QImage.Format_Grayscale8) self.myLabel.setPixmap(QtGui.QPixmap(self.qimg)) My code above returning the following error: TypeError: arguments did not match any overloaded call: QImage(): too many arguments QImage

问题 Can anyone help me resize an image in qt without making the image pixelated. Here's my code. the result is not as good as the original quality..thanks... QImage img(name); QPixmap pixmap; pixmap = pixmap.fromImage(img.scaled(width,height,Qt::IgnoreAspectRatio,Qt::FastTransformation)); QFile file(folder+"/"+name); file.open(QIODevice::WriteOnly); pixmap.save(&file, "jpeg",100); file.close(); 回答1: You have to pass Qt::SmoothTransformation transformation mode to the scaled function like: QImage

问题 Can anyone help me resize an image in qt without making the image pixelated. Here's my code. the result is not as good as the original quality..thanks... QImage img(name); QPixmap pixmap; pixmap = pixmap.fromImage(img.scaled(width,height,Qt::IgnoreAspectRatio,Qt::FastTransformation)); QFile file(folder+"/"+name); file.open(QIODevice::WriteOnly); pixmap.save(&file, "jpeg",100); file.close(); 回答1: You have to pass Qt::SmoothTransformation transformation mode to the scaled function like: QImage

问题 Can anyone help me resize an image in qt without making the image pixelated. Here's my code. the result is not as good as the original quality..thanks... QImage img(name); QPixmap pixmap; pixmap = pixmap.fromImage(img.scaled(width,height,Qt::IgnoreAspectRatio,Qt::FastTransformation)); QFile file(folder+"/"+name); file.open(QIODevice::WriteOnly); pixmap.save(&file, "jpeg",100); file.close(); 回答1: You have to pass Qt::SmoothTransformation transformation mode to the scaled function like: QImage

问题 Are there any known size/space limitation of QPixmap and/or QImage objects documented? I did not find any useful information regarding this. I'm currently using Qt 4.7.3 on OSX and Windows. Particulary I'm interested in: Width/Height limits? Limits depending on color format? Difference between 32/64 bit machines? Difference regarding OS? I would naively suspect that memory is the only limitation, so one could calculate max size by width x height x byte_per_pixel I assume that there is a more

问题 I have written a small GUI using PyQt4 that displays an image and gets point coordinates that the user clicks on. I need to display a 2D numpy array as a grayscale, so I am creating a QImage from the array, then from that creating a QPixmap. In Python 2 it works fine. When I moved to Python 3, however, it can't decide on a constructor for QImage - it gives me the following error: TypeError: arguments did not match any overloaded call: QImage(): too many arguments QImage(QSize, QImage.Format):

问题 In a Program I want to uses QImage.bits() in Delphi. So, in Qt I was created a dll. the dll Source Code Listed in below: test.h: #ifndef TEST_H #define TEST_H #include "test_global.h" extern "C"{ TESTSHARED_EXPORT uchar* testFunc(); } #endif // TEST_H test.cpp: #include "test.h" #include <QtGui> QImage image; uchar* testFunc(){ image.load("c:\\1.png","PNG"); return (uchar*)image.constBits(); } and in the Delphi Side I use this code for using Qt dll: function testFunc(): PByteArray; external