Legacy ImageMagick Discussions Archive

The problem is solved, didn't know that the opacity values are inverted in ImageMagick: 0 for fully opaque and 1.0 for fully transparent !!
So I subtracted the alpha value that belongs to QImage from 255, before scaling the result by 1/255.
mgc.alpha( scale*(255-qAlpha(pix)) );
Setting the matte ...

It works fine for png, I got a semi-transparent image. But it fails for tga, there is no transparency, I just got a gray image.
Did you succeed for the tga case? Would you please try to obtain a semi-transparent tga image with the same code?

hello, I have modified the above toImage function as follows,
Magick::Image* TgaFileType::toImage(QImage& qimage)
{

Magick::Image *newImage ;
double scale = 1 / 255.0;
Magick::PixelPacket *pixels;
Magick::ColorRGB mgc;

newImage = new Magick::Image(Magick::Geometry(qimage.width(), qimage ...

Hi all, I have a QImage (QT's image class) with transparent background. I use the following code to convert it to a Magick image.
Magick::Image* TgaFileType::toImage(QImage& qimage)
{

Magick::Image *newImage ;
double scale = 1 / 255.0;
Magick::PixelPacket *pixels;
Magick::ColorRGB mgc ...