---------- Forwarded message ----------
From: "James Fritzler" <jimbox13@...3425...>
Date: Aug 23, 2017 10:11
Subject: [Inkscape-devel] SVG in 92 and Phyisical Scale
To: "Inkscape-Devel" <inkscape-devel@lists.sourceforge.net>
Cc:

Hi Inkscape Devs!

I’ve used Inkscape for about five years now and have built up quite the library of svg files and have been using 91 since its release. My main creative effort is to build paper toys that I print and cut (in bulk) on a Silhouette Portrait cutting machine. (More info on my works at http://netroids.net ). I have a 100s of files and hoped to use them as my long term "masters” given that SVG is not proprietary and has had such great page layout fidelity for me.

I’d love to update to v92 and future versions but, as is commonly known, the svg save logic has changed to support a new CSS standard of 96dpi and it is affecting my ability to import into my cutting software.

It seems that perhaps the values written by Inkscape in 91 svg files are encoded using a 90dpi scale from their original design-time dimensions. In the past I’ve had much success importing SVGs from Inkscape 91 into Silhouette studio for years. (Granted, I do perform a little cleansing in a copy of the master svg before I go to Silhouette: I simplify the layers, ungroup, and flatten out clones into their own objects. Perhaps it is just serendipity that the Silhouette Studio imports SVGs at the 90dpi. (I tried asking them about dpi but I couldn’t "break through" their first-tier help desk support "fire wall".)

I know there’s an import prompt and process for opening 91 files in 92 and I have participated in the launchpad forum and chat with Mc about this topic. (my user name is jimbox13).

Unfortunate for me, none of the prompts give a workable solution. Here’s what happens to my files based on each option. (I used a diff tool in to investigate some of the changes.)

"Accuracy for sizes and position of paths" (Desired option)

Grid and guides appear to be changed – though I’m not sure to what extent.

Rectangles, paths and strokes are sized up by 6.667%

Inkscape Designer Outcome: shapes and sizes correct right based on the page. :) (bug #1712114 occurs.)

Cutter Software Outcome: File is too large (by 6.667%) for cutting area. :(

"Digital Art"

Grid and guides changed to some degree.

Rectangles and paths not changed.

Inkscape Designer Outcome: shapes and sizes are too small for the page :(

Cutter Software Outcome: shapes and sizes are correct :)

"Accuracy for masks and clips"

Grid and guides changed to some degree.

Rectangles, paths and strokes are changed to some degree, not the same as above.

Inkscape Designer Outcome: shapes and sizes correct right based on the page. :) (bug #1712114 does not occur.)

Cutter Software Outcome: File is significantly too small for cutting area. :(

None of these options produce a svg that maintains its correct physical dimensions across both software packages. I tried experimenting by customizing the "units.xml" file in 92 without success.

Here is my original v91 file zipped. (I added a background rectangle that is the size of the page to help troubleshooting.)

https://www.dropbox.com/s/q6o17j5an2piiw3/acutra_TOCUTv91wBG.zip?dl=0

Is there anything that can be done?

Thanks

Jim

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