Given the following functions, I should be able to create a non-all black image
(assuming input is good)? The only success I have is using Indexed8
QHash<QRgb, qint32 (*)(QRgb)> colorFuncs {
{ Qt::red, qRed},
{ Qt::green, qGreen},
{ Qt::blue, qBlue},
{ Qt::gray, qGray},
};
QImage color8(const QImage &image, int channel) { // Channel is one of Qt::red
Qt::green Qt::blue or Qt::gray
QImage out(image.width(), image.height(), QImage::Format_Indexed8); //
Change to Format_Grayscale8, and get nothing
// for indexed8
QVector<QRgb> values;
values.reserve(256);
if (channel==Qt::gray) { for (int c=0; c<256; c++)
values.append(qRgb(c,c,c)); }
if (channel==Qt::red) { for (int c=0; c<256; c++)
values.append(qRgb(c,0,0)); }
if (channel==Qt::green){ for (int c=0; c<256; c++)
values.append(qRgb(0,c,0)); }
if (channel==Qt::blue) { for (int c=0; c<256; c++)
values.append(qRgb(0,0,c)); }
out.setColorTable(values);
// end for indexed8
int (*colorFunc)(QRgb rgb) = colorFuncs[channel];
for (int y=0; y < image.height(); y++) {
for (int x=0; x < image.width(); x++) {
out.setPixel(x,y, colorFunc(image.pixel(x,y)));
}
}
return out;
}
I'm not familar with Qt and Grayscale8... Anyone know what is going wrong?
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