Legacy ImageMagick Discussions Archive

I used Magick.Net to convert a JPG file to a PDF file.
But the Geometry and Resolution of the result file are changed by converting.
How can I keep the image quality?

Magick.Net:Magick.NET-7.0.4.700-Q16-x64
source:
using (MagickImageCollection images = new MagickImageCollection("test.jpg ...

The pdf has 100 images.
According to the results by 「identify -verbose」,
The Sizes of these images are the same.

But the sizes of the result pdfs are different.
pdf1(converted by ImageMagick):40,438,152 bytes
Image1:486KB
Image2:467KB
Image3:486KB
Image4:467KB
...
Image99:486KB
Image100:467KB

pdf2 ...

Thank you for your answer.

I Looked at identify -verbose image.pdf for both pdf files.
Only the following information is different.

Properties:
date:create: 2017-02-14T12:53:43+08:00
date:modify: 2017-02-14T12:53:43+08:00
Pixels per second: 377KB
User time: 2.512u
Elapsed time: 0:02.319

The ...

I used Magick.Net and Imagemagick to convert the same TIFF file to a PDF file.
But the size of the result file is different.
What's the reason caused this?

ImageMagick:ImageMagick-7.0.4-7-Q16-x64
I converted the TIFF file by command line like this:
Magick test.tif ImageMagick.pdf

Magick.Net ...