add git lfs

data/git-lfs.md

@@ -0,0 +1,18 @@
+---
+title: "git"
+tags: [ "Documentation", "data" ]
+---
+
+Install, and add with
+
+> git lfs install
+
+Then track some filetype with:
+
+> git lfs track "\*.ttf"
+
+Or a directory with:
+
+> git lfs track "images/"
+
+All changes require adding `.gitattributes`.

vision/imagemagick.md

@@ -67,7 +67,7 @@ The above script has crappy results.
 It's better to use potrace.
 
 ```
-$convert input.jpg output.ppm
+$convert -flatten input.jpg output.ppm
 $potrace -s output.ppm -o svgout.svg
 ```