[Qt-interest] QImage::copy fails : Too many color components: 0, max 10

[James Yan]

hey,
i fail to copy sub-area of an image with QImage,  console give me the hint
: QImage::copy fails : Too many color components: 0, max 10

source code like this one:
 QImage im;
if(im.load("d:/1013570.jpg"))
{
 QImage formated = im.convertToFormat(QImage::Format_RGB888);
QImage cp = formated.copy(104,192,258-104,327-192);
 cp.save("d:/cp.jpg");
}

while this one will be OK:

QImage im;
if(im.load("d:/1013570.jpg"))
 {
QImage cp = im.copy(104,192,258-104,327-192);
 cp.save("d:/cp.jpg");
}

why? and how to correct it? thanks.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.qt-project.org/pipermail/qt-interest-old/attachments/20090722/71bc5f9a/attachment.html