Make resize point same as resize to ensure seamless images

main.go

@@ -96,7 +96,6 @@ func serveMarkdown(w http.ResponseWriter, r *http.Request, paths ...string) {
 			pathDir = pathDir[:lastSlash]
 		}
 		// Markdown uses the path to generate the correct paths for resized images
-		log.Print(paths[i], "->", pathDir)
 		html := Markdown(b, pathDir)
 		w.Write(html)
 	}

markdown.go

@@ -15,7 +15,6 @@ package main
 import (
 	"bytes"
 	"fmt"
-	"log"
 	"regexp"
 	"sort"
 	"strings"
@@ -33,7 +32,6 @@ import (
 
 // Markdown renders GitHub Flavored Markdown text.
 func Markdown(text []byte, path string) []byte {
-	log.Print("markdown " + path)
 	const htmlFlags = 0
 	renderer := &renderer{
 		Html: blackfriday.HtmlRenderer(htmlFlags, "", "").(*blackfriday.Html), path: path}
@@ -120,7 +118,7 @@ func (r *renderer) Image(out *bytes.Buffer, link []byte, title []byte, alt []byt
 	writeSource := func() {
 		out.WriteString("<source srcset=\"")
 		attrEscape(out, link)
-		out.WriteString("\" media=\"(min-width: 1024px)\">")
+		out.WriteString("\" media=\"(min-width: 800px)\">")
 	}
 	// link to outside of this website
 	if bytes.HasPrefix(link, []byte("http")) {

resize.go

@@ -39,9 +39,10 @@ func Resize(maxWidth uint, h http.Handler) http.Handler {
 				rw.Write([]byte("error while decoding png: " + err.Error()))
 				return
 			}
-			resizedImage := resize.Thumbnail(maxWidth, 0, image, resize.Lanczos3)
+			resizedImage := resize.Thumbnail(2*maxWidth, 100000, image, resize.NearestNeighbor)
 			resizedBuf := new(bytes.Buffer)
-			if encodeErr := png.Encode(resizedBuf, resizedImage); encodeErr != nil {
+			encoder := png.Encoder{CompressionLevel: png.BestCompression}
+			if encodeErr := encoder.Encode(resizedBuf, resizedImage); encodeErr != nil {
 				rw.WriteHeader(501)
 				rw.Write([]byte("error while encoding png: " + err.Error()))
 				return