GdPicture Rotation

[eharvey]

I have an issue in 6.1.0.11 where rotating an image in a multipage tiff causes the image file size to increase dramatically. I had a 9 image multipage tiff that was saved as a pdf. Without using rotation, the file size was 534k. By rotating three pages the file size jumped to 1910k.

[Loïc]

Hi,

This problem will be fixed for the next release.

If the issue is urgent, a workaround consists to convert the image as 1bpp before saving it.

Best regards,

Loïc

[thowle]

How exactly did you save the rotation to the multipage tiff? I can rotate fro mthe viewer object, but can't find how to save that back to the image?

[Loïc]

You need to open the multipage tiff using a GdPictureImaging object to be able to save the file.

Here a part of the documentation explaining how to display a file opened by a GdPictureImaging object into a GdViewer object:

5. Displaying a GdPicture Image handled by a GdPictureImaging object to a GdViewer object.



The GdPictureImaging class can create GdPicture Image from file, memory RAW, scanner...

If you want to display in real time a GdPicture Image handled by a GdPictureImaging object you can use the DisplayFromGdPictureImage method of the GdViewer class.



VB.NET example:



This example assumes you already have a GdPictureImaging object named oGdPictureImaging and a GdViewer object drawn on your form named GdViewer1.



Dim ImageID As Integer = oGdPictureImaging.CreateImageFromFile("c:\test.jpg")

GdViewer1.DisplayFromGdPictureImage(ImageID)



If later in your code, you want to draw something on the image (like text) and display the modification without reloading the image you can do:



oGdPictureImaging.DrawText(ImageID, "hello Word!", 50, 50, 10, FontStyle.FontStyleBold, Color.Red, "Arial", True)

GdViewer1.Refresh()