c++ - Not able to use the loaded Image data properly -


i load image raw data , use qimage::format_monolsb format while loading. try write file, , image in b&w mono color format. ok.

what way image out of in color format ? eg: if want color while portions particular color, how do ?

i tried create qimage using qimage::format_argb32_premultiplied, , used painter draw 1 got above using pen/brush. not seem work. suspect there compatibility issue between formats. 

   colorimage = qimage(qrect(0, 0, w, h), qimage::format_argb32_premultiplied);    _painter.begin(&blockimage);    _painter.setpen(qt::blue);    _painter.drawimage(qrect(0, 0, w, h), blockimage, aboveimage);    _painter.end();

i tried change loading code use color format (format_argb32_premultiplied), not seem work either. no image in output.

you're drawing blockimage on blockimage. think want paint on colorimage instead: _painter.begin(&colorimage);

anyway, use qimage::converttoformat , pass in color table instead.


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