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List:       kde-devel
Subject:    Re: QImage conversion functions
From:       David Johnson <david () usermode ! org>
Date:       2008-08-26 19:55:29
Message-ID: 200808261255.29097.david () usermode ! org
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On Tuesday 26 August 2008 12:49:44 pm David Johnson wrote:
> QImage likes to keep stuff in its own internal format, so for example when
> you scale the image you lose the mono format. Reordering your operations
> fixed most things. What isn't fixed is the bit depth of the saved image. I
> think this is just how QImage saves TIFF images. When you save as PNG you
> get 1 bit depth.

Here's the code I meant to attach: 

#include <QDebug>
#include <QtGui>

int main()
{
    QImage img = QImage("image.png");
    int newHeight= img.height()*2;
    int newWidth= img.width()*2;
    img = img.scaled(newWidth, newHeight, Qt::KeepAspectRatio, 
                     Qt::SmoothTransformation);
    img = img.convertToFormat(QImage::Format_Mono, Qt::MonoOnly);
    img.setDotsPerMeterX(150*39); //150 dpi
    img.setDotsPerMeterY(150*39); //150 dpi
    qDebug() << img.depth();
    img.save("output.tif", "tiff", 100);
    img.save("output.png", "png", 100);
}

-- 
David Johnson
 
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