Hello, I have a question regarding the result when you process a PDF or an image using the command “Convert in disposable qube” or convert it into a trusted file.
I have found that the file usually becomes smaller (which seems somewhat logical). But in some cases, the file of the converted PDF or image becomes larger.
What is the reason for that?
Thank you for your opinions.
Image compression.
In my opinion, that will make only sense if file size decreases, but not if file size rises up. “Compression” means making things smaller not bigger. Therefore there must be another explanation I think.
Sometime in the last 6 months there was a change to the default DPI (dots per inch) of the generated images, raising it to 200 or 300 iirc.
If your original pdf has, say, 75 DPI images, they will be resized and become bigger.
Makes sense?
In my opinion, that will make only sense if file size decreases, but not if file size rises up.
Actually, it makes more sense to see the size increase because text data is naturally less than image data.
“Compression” means making things smaller not bigger.
That’s the dictionary meaning. However, in the world of computers, it is not always like that and it is possible to see size increase. It all depends on the algorithm and the source data.
Therefore there must be another explanation I think.
You can read the source code and find that explanation.
The nature of the PDF also changes, and that can account for an
increase in size. You can read the original report explaining this here
I never presume to speak for the Qubes team.
When I comment in the Forum I speak for myself.
Many thanks for informations and the link to explanations. This makes sense, I didn´t know the link.