DPI in bitmap output

rbuser

Hello,

if I select DeviceType := 'PNG' (or 'BMP' or 'GIF' or 'JPEG') I obtain page
files with a resolution of 794 x 1123 pixels, that correspond to 96 DPI.
How can I increase the resolution to 300 DPI (corresponding to 2480 x 3507
pixels)?

Thanks.

--
Andrea Nini

nicocizik

Hi Andrea,

By default the Image Device(s) export each page at 100% according to the
screen resolution which is generally 96 ppi. You can increase the scale
used by altering the TppImageDevice.Scale property.

For instance, increasing the scale to 3.125 (300 / 96) should give you a
2480 x 3507 image.

rbuser

Wed, 03 Jun 2015 09:32:13 -0600, Nico Cizik (Digital Metaphors) wrote:


Currently I print to an image file with this code:

ppReport1.DeviceType := 'PNG';
ppReport1.ShowPrintDialog := False;
ppReport1.TextFileName := 'c:\test.png';
ppReport1.Print;

How can I set the TppImageDevice.Scale property? Can you make me an
example?

Thanks.

--
Andrea Nini

rbuser

Wed, 3 Jun 2015 18:11:26 +0200, Andrea Nini wrote:


I have found this example and now I've understood the procedure:

http://www.digital-metaphors.com:8080/index.php?title=Output/Image/Image_Device_Fundamentals

Thanks.

--
Andrea Nini

nicocizik

Hi Andrea,

I apologize for the delayed response.

In addition to the method used in the example, you can access the file
device (Image Device) using the OnFileDeviceCreate event.

For example...

procedure TForm1.ppReport1FileDeviceCreate(Sender: TObject);
begin
if (ppReport1.FileDevice is TppImageDevice) then
TppImageDevice(ppReport1.FileDevice).Scale := 3.125;

end;