Sorry a typo qRgb(qRed(rgbVal), qRed(rgbVal), qRed(rgbVal)) for setting
the pixel on the red channel
On 3/16/2018 4:25 PM, Nikolai Tasev wrote:
Yes that confirms my suspicions that setPixel for Format_Grayscale8
expect different things ( as I wrote in my previous email).
You need to pass qRgb(qRed(rgbVal), 0, 0) for red, not qRed(rgbVal).
On 3/16/2018 4:09 PM, Jason H wrote:
5.10.1
Yes, that's a good idea. So I wrote some code:
QImage gray8 = color8(image, Qt::gray,
QImage::Format_Grayscale8); // modded my function to take the format.
QImage index = color8(image, Qt::gray, QImage::Format_Indexed8);
int differences = 0;
int same = 0;
for (int y=0; y < gray8.height(); y++) {
for (int x=0; x < gray8.width(); x++) {
qDebug() << "gray" << gray8.pixel(x,y) << "index" <<
index.pixel(x,y);
if (gray8.pixel(x,y) != index.pixel(x,y) )
differences++;
else
same++;
}
}
qDebug() << "differences" << differences;
qDebug() << "same" << same;
With output:
differences 8048393
same 72951
It seems every pixel from "gray8" is 4278190080 == 0xFF000000.
So it seems that setPixel in my color8 function never sets the pixel.
I'm thinking this is a bug, unless someone has an idea?
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