File Size Changes When I export

[Rezia]

Hi 

Every time I need to export my file to jpeg or svg, my file size changes. Especially svg files. I need my measurements to be exact as i do a lot of lasering work. If the measurements are out, then it causes me problems when cutting my files. 

How can the dimensions stay fixed when I export my file? 

Edited September 21, 2021 by Rezia

[GarryP]

Do you mean that the boundary dimensions of the contents of the exported image change, rather than the size of the file in bytes?
If you can attach an example of both your original document and the exported file then someone can look into this for you.
Otherwise we can only guess as to what is happening.

[Wosven]

Other people are having the same problem. It's possible searching Laser cutter or the brand you're using will find threads where they give their own recipes to solve the problem.

https://forum.affinity.serif.com/index.php?/search/&q=Laser cutter&quick=1

[Rezia]

So, I saved it as 1cm width. Exported it as SVG. Opened it up again, and the size has changed. See screenshots. 

W should be 37.8 px.

When I open the same file, it changes to 76.6px. 

[Wosven]

Again, search with your brand of Laser cutter or look at the answers in the search I posted, you'll probably find what you need.

[Old Bruce]

Is your Designer Document set to 192 DPI and is that what your Laser needs 192DPI? I ask because 192 is double 96 which is a common screen resolution. The file size is double what it "should be".

[schack]

Same happens to me. 

My 2 cents, get used to it. Designer is pretty much useless for anything in regards to physical size. It can only usefully export vector graphics in .svg that is notoriously bad at retaining size. It's the ongoing conundrum of Designer that it's a really competent vector drawing app but most of its export options are bitmap based.