Hi Gunnar,
Thanks for the quick reply.
>This code makes little sense... First you create the pixmap
>with ARGB32 format, then convert it to ARGB32 format? This is
>a redundant operation and should be removed.
Yes you are correct :-))
>Using a painter for this is overkill and in addition to being
>a lot more expensive... why not just:
> img1.setPixmap(i, j, qcol.argb());
That was the first thing I tried, but there was dither. So then tried
with Qpainter.
My original code was:
for (int i = 0; i < w(); i++) {
for (int j = 0; j < h(); j++) {
int col = img.pixel(i, j);
if (col == 0) {
continue;
}
QColor qcol = new QColor(col);
qcol.setHsvF(0.0, 1.0, 0.0, 1.0);
img.setPixel(i, j, qcol.rgba());
}
}
return img;
>The reason you have artifacts along the edges of your image is
>because you are drawing with anti-aliasing. A complete
>description of the coordinates system is covered here:
>http://doc.trolltech.com/qtjambi-4.4/html/com/trolltech/qt/coor
>dsys.html
>
>but you probably just want to use QImage::setPixel().
I had gone through this, and have tried almost all possible combinations
of render hints and pen/brush styles with a painter, but come across the
same problem. I am stuck. I can increase the pen width and this dither
goes away, but the image no longer resembles the original in terms of
size/sharpness.
Or should I write some algorithm to blur only the edges and thus hide
this dither. But that would make the whole thing even more heavy. Any
ideas ?
BR
Chetan
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