Cannot import image accurately [SOLVED]

[minege]

Hello,

I try to import a 400x400px image.
On this image i’ve made multiple measures. There are a few lines with the size next to them.
I try to calculate the same size in KiCad with the measurement tool, but it just can’t get the right size.

For the DPI setting, i’ve did :

400x25.4/105.83
which is {size in pixel}x25.4/{size in mm}

and i get 96. Tho, when i measure it in Kicad it’s not correct.
Then i go by trials and errors to get the correct size; a bit more, a bit more, a bit less, etc.
But now that i am very near the correct size, it’s OR too big, OR too small. And i can’t put comma in Bitmap2Component.
Do you have any tricks ?
Thanks

( I want to import this image to place components in the correct position )

[Rene_Poschl]

What is the source for the image?

If you need such precise placements maybe a format like dxf might be a better idea.

[minege]

Thanks for the reply.

Ok, i will have a look into DXF.
The test image i’m trying to import is the one included in the message.
(I’m mesuring the bottom 120MM one, because it’s more precise than others)

[minege]

Ok, i tried with a DXF. It’s very precise.

Thanks Rene_Poschl !