precission of convertTransform too low.

[JoKalliauer]

It seems that the background precission is too low, and the precission set is just the rounding afterwards.

In svgcleaner I need a precission of '--transforms-precision 7' or higher, but in SVGO I can increase the precission, but nothing changes (I tried everything in the range of -p 2 up to -p 10, without any visual changes).

##Original file
Bug1SVGOinput.svg.txt

##Optimizced file
Bug1SVGOoutput.svg.txt

---

Copyright

License: {{self|cc-by-sa-3.0|GFDL}}

Author: https://commons.wikimedia.org/wiki/User:Addicted04

Source: https://upload.wikimedia.org/wikipedia/commons/5/50/Philippines_%28orthographic_projection%29.svg

Details: https://commons.wikimedia.org/wiki/File:Philippines_(orthographic_projection).svg

[GreLI]

Well, it's a balance between file size and image precision. It's ok for usual icons and web images, but one should use more precision for high-detailed images like this. If I change it for better precision, many image files size would be bigger without real need for it.

In SVGO in convertPrecision plugin it has default precision floatPrecision + 2 (i.e. -p option plus two), but there is another plugin convertPathData that also has transformPrecision option.

[JoKalliauer]

@GreLI Thanks for answering:
I further optimiced the input with SVGO, with convertPathData (and other options except convertTransform), but it didn't help.

Input

Bug1021_Input2.svg.txt

$ svgo -i Bug1021_Input2.svg.txt -o Bug1021_Input2.svg.txt --pretty --indent=1 --disable=convertTransform --enable=convertPathData

• Bug1021_Input2.svg.txt:
• Done in 2423 ms!
• 611.409 KiB - 0% = 611.409 KiB

Optimization -p 8 fails

Now I run convertTransform with -p 8: Bug1021_Output2.svg.txt

$ svgo -i Bug1021_Input2.svg.txt -o Bug1021_Output2.svg.txt -p 8 --pretty --indent=1 --enable=convertTransform --disable=convertPathData

optimizations with -p 2 works (after other opimizaion):

But if you can run svgo with -p 2 --enable=convertTransform after other optimization:

$ svgo -i Philippines (orthographic projection).svg -o
Bug1021_SolvedOutput.svg.txt
--pretty --indent=1 -p 2 --enable=convertTransform
min.svg:
Done in 1815 ms!
401.268 KiB - 0% = 401.131 KiB

And the Output is perfect:

Therefore I would like to have doublefloatpreccision-calculation, and rounding aferwards, this might solve this issue, with increasing precission, without increasing file size. (But maybe increasing processingtime.)

---

Copyright

License: {{self|cc-by-sa-3.0|GFDL}}

Author: https://commons.wikimedia.org/wiki/User:Addicted04

Source: https://upload.wikimedia.org/wikipedia/commons/5/50/Philippines_%28orthographic_projection%29.svg

Details: https://commons.wikimedia.org/wiki/File:Philippines_(orthographic_projection).svg

[KTibow]

convertTransform isn't a real plugin - you need to configure it in the convertPathData settings.

[JoKalliauer]

convertTransform isn't a real plugin - you need to configure it in the convertPathData settings.

Not sure what that means, what can I change?

---

Steps to reproduce:

• download Bug1021_Input2024-01-04
• use https://jakearchibald.github.io/svgomg/ (SVG 3.0.0) with activated Round/rewrite transforms and set Transform precision to max (8)
• compare Output with Input

input	output
1234567890123456789012345678901234567890123456	1234567890123456789012345678901234567890123456

and also replicated locally with svgo 3.2.0 with svgo.config.js.txt

[KTibow]

First problem: your config is still using an old format, from what I understand active was removed in SVGO v3.
Second thing: as of #1916, convertTransform is now a separate plugin which you can easily disable.