Having problem resizing the output image from pdf

Aspose.PDF Product Family
1

I am taking a pdf converting it to an image.

The problem is, that I want to resize the image and it won't resize.

I am using this code:

pdfConverter.GetNextImage(Response.OutputStream, System.Drawing.Imaging.ImageFormat.Jpeg, 100,100, 50);

Now, the last param will work..it reduced image quality, but the 100 and 100 do not take any effect at all. I cannot get anything other than the default size.

What am I missing. I am using the latest version of the .dlls already.

2

Hi Mike,

You are calling an overload that accepts image resolution integer parameter.

If you are going to change image size, please call the overload that accepts float parameters:

pdfConverter.GetNextImage(outFile, System.Drawing.Imaging.ImageFormat.Jpeg, (float)100, (float)100, 100)

3

Aha! Such a simple oversight by me. Thanks. That resized the image.
Followup question.

Is there a way to do this as a "percentage" instead of a fixed amout? Say, I don't know the original size, but would like it to be 50% of original. Is there a way to find out the outputted size first, then maybe do some math (assuming a pct doesn't work)?

4

Here is how I resolved the "percentage" problem for anyone out there that needs this info.

I set a "zoomsize" variable" and multiply it against the original height produced by aspose pdf-image convert.

MemoryStream ms = new MemoryStream();

if (pdfConverter.HasNextImage())

{

pdfConverter.GetNextImage(ms, System.Drawing.Imaging.ImageFormat.Png);

}

//ms.WriteTo(Response.OutputStream);

System.Drawing.Image image = System.Drawing.Image.FromStream(ms);

Bitmap result = new Bitmap(Convert.ToInt32(Math.Round(image.Width * zoomSize, 0)), Convert.ToInt32(Math.Round(image.Height * zoomSize)));

//use a graphics object to draw the resized image into the bitmap

using (Graphics graphics = Graphics.FromImage(result))

{

graphics.DrawImage(image, 0, 0, result.Width, result.Height);

}

ms.Close();

pdfConverter.Close();

outmemStream.Close();

result.Save(Response.OutputStream, System.Drawing.Imaging.ImageFormat.Png);

5

Hi Mike,

We’re glad to know that you have worked it out. If you need any further assistance from our end, please do let us know.

Regards,