SVG import pixel to point conversion
-
For a good reason I specify line values in pixels in Qgis. If I import an SVG with a 1 pixel line object into AI I get a 1 pt line in return for it which is nice. This conversion is probably based on the old rule "1 pt = 1/72 inch. Therefore, on a 72 ppi display, 1 point = 1 pixel".
Vectorstyler returns me a line value of 0.2 pt on a 1 pixel line, which is inconvenient for me. Is this by design? I understand that pixels have become a relative unit of measurement nowadays with the advent of higher resolution displays.
How does this work in Vectorstyler import SVG?
-
@Ayo said in SVG import pixel to point conversion:
How does this work in Vectorstyler import SVG?
It should be 1 px to 1 pt. Is the file opened or imported?
Send me an example file where this occurs.
-
Opening or importing > placing makes no difference.
For example
Specified > VS- river lines are 1 pixel > 0.2 pt
- lat/lon gridlines is 0.5 pixel > 0.1 pt
- coastline is 2 pixel (half buried under land cover) > 0.5 pt
By email VS file and original SVG TINYMAP
EDIT:
The earlier mentioned wrong type size value display also occurs in this file.
Specified 6pt > VS 25 pt
-
@Ayo I opened the file in VS, AI and Affinity and all gave the same line width of 0.239 pt.
What is the version of AI you used?
-
-
@VectorStyler said in SVG import pixel to point conversion:
all gave the same line width of 0.239 pt
If it should be 1:1, they are all wrong. Or is there some other mysterious ratio behind it?
-
@VectorStyler said in SVG import pixel to point conversion:
all gave the same line width of 0.239 pt
Or an example of copying and pasting SVG code snippets that can replicate bugs across multiple applications?
-
@Ayo said in SVG import pixel to point conversion:
Or an example of copying and pasting SVG code snippets that can replicate bugs across multiple applications?
Yes, this would help if you have such an example.
I also opened the file in Inkscape and it reports 0.241 pt stroke width.
-
@Ayo Found the cause, it is not a bug.
The SVG header sets a "viewBox" scaling and all apps (including VS) will scale accordingly.
Workaround: in VS, after opening the file, select all and select Effects -> Remove All Shape Effects.
This will remove all viewbox transforms, it will also remove the y-flip depending if it was opened or imported (SVG and VS cordinate directions are different) so you may need to flip the drawing vertically.
-
@VectorStyler said in SVG import pixel to point conversion:
Workaround: in VS, after opening the file, select all and select Effects -> Remove All Shape Effects.
Hmm... quite complex.
If I do that, artwork is indeed flipped AND becomes about 4x bigger. Then scale everything back 24% to original size. Stroke weights are fine then. You would think that the type point size should also be fine with this trick, but it remains 25 pt. Scaled or not.
-
@Ayo said in SVG import pixel to point conversion:
You would think that the type point size should also be fine with this trick
This is a different issue.
-
@Ayo said in SVG import pixel to point conversion:
Hmm... quite complex.
Yes, the problem is that I cannot ignore what is in the SVG header, otherwise it is not a correct import.
And the SVG header scales from a viewBox into a width/height that is different.
-
@VectorStyler said in SVG import pixel to point conversion:
Yes, the problem
Got it... (a little)
Remember that the problem can also be on the other side. In other words; the SVG output of Qgis can also contain imperfections or errors.Still strange that ai6 does work against all common opponents. I wonder what Freehand would do but I don't have that working under the buttons anymore.
Thanks for investigating
